91 results about "Lithium electrode" patented technology

Positive electrode active materials are described that have a very high specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. Some materials of interest have the formula Li_1+xNi_αMn_βCO_γO₂, where x ranges from about 0.05 to about 0.25, α ranges from about 0.1 to about 0.4, β ranges from about 0.4 to about 0.65, and γ ranges from about 0.05 to about 0.3. The materials can be coated with a metal fluoride to improve the performance of the materials especially upon cycling. Also, the coated materials can exhibit a very significant decrease in the irreversible capacity lose upon the first charge and discharge of the cell. Methods for producing these materials include, for example, a co-precipitation approach involving metal hydroxides and sol-gel approaches.

The invention discloses a silicon oxide/carbon cathode material of a lithium ion battery and a preparation method of the material. The silicon oxide/carbon cathode material is a three-layer compound material with a core-shell structure and takes a graphite material as an inner core, porous silicon oxide as a middle layer and organic pyrolytic carbon as an outermost covering layer; and the preparation method comprises a process of preparing porous SiOx and a carbon covering process. Compared with the prior art, active metal is added to reduce SiOx partially, the volume expansion effect of silicon particles is greatly reduced as the volume expansion effect of the silicon particles in the charging and discharging processes can be automatically absorbed by the obtained product structure, and the initial charging and discharging efficiency and the cycling stability are remarkably improved. The initial reversible specific capacity is larger than 600 mAh/g, the initial charging and discharging efficiency is higher than 88%, the capacity retention ratio is higher than 98% after the capacity is cycled for 50 times, the synthetic process is simple and easy to operate, the manufacturing cost is low, and the large-scale production is easy to realize.

The invention relates to a capacitor of a lithium ion battery. The capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, wherein the positive plate and the negative plate are respectively connected with a positive lug and a negative lug and are led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell. A negative active material comprises a material A and a material B, wherein the material A comprises at least one of hard carbon and soft carbon, the material B comprises at least one of natural graphite, modified graphite and synthetic graphite, the material A accounts for 50.0%-95.0% of the capacity percentage of the negative active material, and the material B accounts for 5.0%-50.0% of the capacity percentage of the negative active material. The capacitor has the high-energy density characteristic of the lithium ion battery and the high-power density characteristic of a double electric layer capacitor.

The invention relates to the technical field of lithium ion batteries, in particular to core-shell structured carbon for a cathode material of a lithium ion battery and a preparation method thereof, and the lithium ion battery taking the core-shell structured carbon as the cathode material and a preparation method thereof. The core-shell structured carbon comprises a hard carbon material serving as a 'core' and soft carbon 'shell' which is coated on the surface of the 'core'. On the one hand, the hard carbon material serving as the 'core' provides a large number of spaces for storing lithium and channels for lithium ions to move, and the energy density and power density of the material are improved, and on the other hand, the soft carbon 'shell' with a graphite structure ensures that the material has high coulombic efficiency and cycle performance, so that the lithium ion battery made of the core-shell structured carbon serving as the cathode material has high capacity, high power characteristic, high cycle performance and high first charge and discharge coulombic efficiency, the preparation method is simple, and the cost is low.

The invention discloses a thermal runaway test analysis system for a lithium ion battery. The thermal runaway test analysis system comprises an experimental device, a testing device and a data collection and treatment system, wherein the experimental device comprises a heat-conducting pipe and a thermal insulation system; a resistance wire is wound on the outer wall of the heat-conducting pipe; the heat-conducting pipe is embedded into the thermal insulation system; a lithium ion battery mounting hole is formed in an inner cavity of the heat-conducting pipe and is used for mounting a to-be-tested lithium ion battery; a temperature sensor mounting hole is formed in the top end of the heat-conducting pipe and is used for mounting a temperature sensor; and the thermal insulation system is composed of a container and a heat-resisting insulating layer in the container. The thermal runaway test analysis system for the lithium ion battery, which is disclosed by the invention, is reasonable in structure, convenient to operate and diverse in function; thermal runaway of the lithium ion battery can be tested by the factors such as environment temperature, high-temperature environment, charge-discharge multiplying power and cooling condition by using the system; the collection accuracy of experimental data is relatively high; a data collection and analysis system is convenient to use; and the test accuracy can be ensured.

The invention relates to a surface coating modified lithium ion battery cathode material and a preparation method thereof. The surface coating modified lithium ion battery cathode material has a general chemical formula of LiNi<1-a-b>CoaAlbO2/M, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and M refers to a coating layer. The material is coated by adopting a dry method; the coating layer refers to one or a mixture of two of lithium iron phosphate and lithium ferric manganese phosphate; and the mass ratio of the coating layer to LiNi<1-a-b>CoaAlbO2 is (0.01-0.2):1. The surface coating modified lithium ion battery cathode material and the preparation method thereof disclosed by the invention have the advantages that the stability of the cathode material is improved, and the safety performance of the material is improved; and moreover, in the dry-method coating process, waste liquor is not produced, high-temperature sintering is not needed, and the energy consumption and cost can be reduced.

The invention discloses an alumina coating method of a lithium ion battery positive electrode material. The method comprises the following steps: adding ammonia water to a positive electrode material suspended aluminum nitrate solution in a dropwise manner to form a precipitate coated by Al(OH)3, and heating the precipitate in an air atmosphere muffle furnace to form an alumina coated positive electrode material. The coating method can improve the charge and discharge capacity of the lithium ion battery and prolong the cycle life.

The present invention relates to a method for winding coil core of lithium ion battery which comprises of steps of: unreeling the first membrane and the second membrane by unwinders of their own respectively at the same time, sending two source of two membranes connected between upper briquetting and lower briquetting of unwinder to be clamped, puncturing coiling needle, and inserting two electrode slices, driving upper briquetting and lower briquetting closed to clamp the next first membrane and the second membrane making the clamped parts of two membranes are connected, starting membrane cutter to cut the two membranes, pressing and binding the coiled coiling core rudiment, the winding coil core of lithium ion battery is obtained. Comparing to the present technique, the present invention can reduce cost of winding coil core of lithium ion battery, and at the same time, is suitable for semi-automatic and full-automatic unwinder and improves the production efficiency.

The invention discloses a lithium-ion battery heat insulation device and a control method thereof. The heat insulation device comprises an insulation box for containing a lithium-ion battery, and a temperature control circuit of which the power is supplied by the lithium-ion battery and which is used for controlling the ambient temperature around the lithium-ion battery; and the temperature control circuit is arranged in the insulation box. The temperature control circuit comprises a temperature detection module, an automatic temperature control switch module and a temperature controlling device; the temperature detection module is connected with the automatic temperature control switch module; and the automatic temperature control switch module is serially connected with the temperature control device. The invention solves the problem that an existing lithium-ion battery is seriously restricted by the ambient temperature when being used, so that an ordinary lithium-ion battery can be used normally not only at room temperature but also in cold environment and at high temperature, and the invention has the advantages of simple structure, easiness in manufacturing, convenience in use and good adaptability.

The invention relates to an electrolyte for a ternary cathode material lithium ion battery. The electrolyte comprises a lithium salt, organic solvent and an additive, wherein the lithium salt is an imidodisulfuryl fluoride lithium salt of which the concentration is greater than 1 mol/L; the organic solvent comprises cyanogen carboxylate and other non-water organic solvent; the addition mass of the cyanogen carboxylate is 5-35% of the total mass of the organic solvent; the cyanogen carboxylate is a combination of one or more selected from the following structural formulae in the specification; and at least one of R1 and R2 is a cyanogen radical or a cyanogen radical containing group. By using the electrolyte provided by the invention, the cycle performance of the ternary cathode material lithium ion battery at normal temperature can be stabilized, the aging and swelling phenomena of the ternary cathode material lithium ion battery under high-temperature conditions can be inhibited, and the internal resistance of the ternary cathode material lithium ion battery is reduced.

The invention relates to the field of lithium ion battery designs, and discloses a lithium ion battery pack and a soldering method for single batteries therein. The lithium ion battery pack comprises a plurality of single batteries which are connected in series or in parallel through soldered lugs; and the soldering method for soldering the first lug and the second lug of any two single batteries includes the following steps: a rigid plate is arranged on the backs of the horizontal bent sections of the first lug and the second lug, and is in plane contact with the backs of both the first lug and the second lug, wherein a predetermined gap is reserved between the first lug and the second lug which are horizontally opposite to each other; soldering is carried out on the top of the rigid plate in the gap between the first lug and the second lug, a tin bar is melted, the gap is covered by and filled with the melted tin, and the melted tin permeates to the top of the rigid plate; and the melted tin is solidified and shaped. The heat-dissipating effect of the method is better, and moreover, the structure of the soldered parts of the lugs is firmer, which can help to enhance the conductivity of the lithium ion battery pack.

The invention relates to a graphite negative electrode material of a low-temperature lithium ion battery and a preparation method thereof. The graphite negative electrode material of the low-temperature lithium ion battery comprises graphite and a fast ion conductor coated on the graphite surface; The oxidation-reduction potential of the fast ionic conductor is higher than that of graphite. The preparation method comprises the following steps of: wet ball milling the original graphite powder, drying the mixed liquid into powder by a spray dryer to obtain graphite powder with smaller particle size, intercalating the graphite powder, coating the surface of the graphite powder, and obtaining graphite negative electrode material for low-temperature lithium ion batteries. As in that anode material structure, particle size of the graphite can be controlled, diffusion distance of lithium ion is shorten, graphite interlayer spacing is increased after intercalation, that ion diffusion ability of the electrode material at low temperature can be obviously improved, the integral conductivity can be improved by intercalated metal or highly conductive substance between graphite layers, and a stable and uniform SEI film can be formed by coating a fast ionic conductor on the graphite surface, the lithium ion diffusion ability can be improved, and the interface property at low temperature can be improved. This material can also be used as an ideal cathode material for sodium ion batteries and high performance supercapacitor materials.

The invention discloses a composite phosphate type anode material for a lithium ion battery, and a preparation method thereof. The composite phosphate type anode material can cause the raw material containing metals, lithium and phosphorus source and/or superfine LiMPO4 and/or superfine Li5-yM'2(PO4)3 to react under inert or reducing atmosphere and high temperature to synthesize LiMPO4 and Li5-yM'2(PO4)3 composite phosphate with combined chemical bonds, and by adding a conductive agent ball grinder, the composite anode material with excellent electrochemical performance can be obtained. The composite anode material prepared by the method has the advantages of low cost, unique process method and good electrochemical performance; the industrialization is easy to achieve.

The invention discloses a modified lithium-rich manganese-based cathode material for a lithium ion battery. The structural general formula of the material is (La<1-x>Sr<x>)MnO<3-delta>, wherein x is equal to or greater than 0 and less than or equal to 0.3, a is equal to or greater than 0.8 and less than or equal to 1, and delta is equal to or greater than 0 and less than or equal to 0.75; the modified lithium-rich manganese-based cathode material is prepared through the method 1 or method 2 as follows: method 1: lanthanum salt, strontium salt and manganese salt are mixed according to the stoichiometric proportion to prepare a (La<1-x>Sr<x>)MnO<3-delta> precursor solution, then a complexing agent is added into the solution and stirred uniformly, the lithium-rich manganese-based cathode material is added into the solution, heating is performed to evaporate the solution to form gel, and finally the dried gel is calcined, so that the modified cathode material is obtained; method 2: a precursor solution is prepared according to the method 1, a complexing agent is added into the solution and stirred uniformly, then the mixed solution is heated until the solution is burnt into powder, the powder is pre-burnt and is mechanically mixed with the lithium-rich manganese-based cathode material, and the mixture is calcined, so that the modified cathode material is obtained.

The invention discloses an electrolyte for improving the low temperature performance of a lithium ion battery and a lithium ion battery comprising the same. The electrolyte comprises conductive lithium salt, a non-aqueous organic solvent, and additives, wherein the additives include a conventional negative electrode film forming additive, an additive with the structure of Formula I, and an anhydride-type compound additive with the structure of Formula II. According to the battery electrolyte provided by the invention, under synergistic effects among the additive with the structure of Formula I, the anhydride-type compound additive with the structure of Formula II, a nitrogen-containing lithium salt type additive and the conventional negative electrode film forming additive, the electrolytethus has excellent film forming performance on the electrode surface, the cycle performance and the rate performance of the lithium ion battery in a low temperature condition can be effectively improved, and the high temperature cycle performance and the storage performance of the battery are little affected.

The invention relates to a device and method for detecting an environmental parameter in a lithium ion battery explosion process. The device comprises a sealed observation device provided with an oxygen-free environment therein and an observation window; a clamping device for fixing a lithium ion battery, disposed in the sealed observation device and detachably connected with the sealed observation device; an electric signal input device disposed outside the sealed observation device and connected with the positive and negative poles of the lithium ion battery via wires; a data acquisition device disposed in the sealed observation device and fixedly connected with the sealed observation device; a data output device disposed outside the sealed observation device and connected with the data acquisition device via a wire. The device and method provide a safe detection environment for the explosion tests of the lithium ion battery, separate testing equipment from testing environment, and guarantee accurate environmental parameter acquisition in the lithium ion battery explosion process.

The invention provides a high breathable polymer coated diaphragm as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, soaking one side of a base membrane in wetting liquid for pre-wetting and coating the other side of the base membrane with casting film liquid; secondly, soaking by using a modified coagulation bath to extract a solvent in the coating membrane and enabling the coating layer surface of an initial membrane to form uniform cavernous holes; soaking, washing and drying for removing water to obtain the high breathable polymer coated diaphragm. The polymer coated diaphragm prepared by the preparation method provided by the invention has the advantages of high porosity, uniform hole distribution on the surface of the coating and capability of significantly improving the comprehensive performance of a lithium-ion battery separator.

The said invention or apparatus is for users to swim and be totally submerged underwater with an adequate supply of air for extended periods of time. The apparatus is a sealed water resistant enclosure supporting a hollow air intake pipe with and attached hollow air intake sphere mounted on the top. The bottom half of the air intake sphere has many holes to allow air into air intake riser and drain unwanted water out. The apparatus does not require regulators, pressure vessels, diaphragm pumps or compressors, internal combustion engines or external power sources. A low pressure blower and filter assembly with a rechargeable and easily replaceable lithium ion battery are mounted inside the buoyant water resistant enclosure. Air is drawn into the low pressure blower suction and through an air filter delivering constant air flow to the swimmer through an attached flexible air supply hose. The apparatus uses three check valves to constrain air flow supply unidirectional to the swimmer while venting excess air. The apparatus has a hand pump to vacate unwanted water from the mouth piece or mask and draw in purging air while the swimmer is submerged. For stability the apparatus has a designed center of gravity below the meta center of the underwater portion of the buoyant water resistant enclosure giving a positive GM and strong self-righting moment in calm or rough seas. For safety the apparatus has a grab handle and a tether line connection from the bottom of the buoyant water resistant enclosure. The tether line is attached to the swimmer.

The invention provides a manufacturing method of a winding type lithium ion battery and the winding type lithium ion battery, and relates to the technical field of lithium ion batteries. The method comprises the following steps: punching a foil on one side of a positive pole piece and a foil on one side of a negative pole piece to be saw-toothed to form a saw-toothed positive pole piece and a saw-toothed negative pole piece; arranging an isolating film between the saw-toothed positive pole piece and the saw-toothed negative pole piece in a laminating mode for winding to form multiple layers of positive tabs and multiple layers of negative tabs. The battery comprises an outer composite aluminum plastic film and a multi-tab lithium ion cell, wherein the multi-tab lithium ion cell comprises the positive pole piece, the isolating film and the negative pole piece which are laminated and then wound; one side of the positive pole piece and one side of the negative pole piece adopt saw-toothed structures, and the positive pole piece and the negative pole piece are wound to form the multiple layers of positive tabs and the multiple layers of negative tabs. The production efficiency of a Z-shaped lamination battery is improved, the potential safety hazard of a Z-shaped lamination process in assembly is reduced, the internal resistance of the battery is reduced, and large current discharge is achieved.

The invention belongs to the technical field of new energy materials, in particular to an all-solid-state lithium ion battery and an integrated composite sintering preparation process thereof. The all-solid-state lithium ion battery comprises at least one electrode-electrolyte composite electrode sheet. The electrode of the electrode-electrolyte composite electrode sheet is made of lithium oxide positive electrode or oxide negative electrode material, and the electrode is a solid oxide electrolyte. The interface problem of the all-solid-state lithium battery can be effectively improved and theinterface bonding degree and the interface structure stability between the electrode and the solid electrolyte can be remarkably enhanced so that the single cell has higher density and energy densityand also has very excellent safety performance and is suitable for large-scale production and application.

The invention provides a lithium ion battery cathode, the cathode comprises a current collector and a cathode material layer positioned on the surface of the current collector, wherein the cathode material layer is a copper stibium alloy electroplated layer, the thickness of the copper stibium alloy electroplated layer is 5-40 mum, the weight content of copper in the copper stibium alloy is 35%-65%. The invention also provides a method for preparing the lithium ion battery cathode by depositing the copper stibium alloy on the current collector through an electroplating method. The invention also provides a battery which takes the cathode as the lithium ion battery cathode. The lithium ion battery cathode of the invention has the advantages of excellent conductive performance, cycle performance and heavy current charge and discharge performance, the plated layer and the current collector base material enable strong bonding force, the cathode material on the surface of the current collector possesses a stable structure. The electroplating method used by the invention is capable of accurately regulating and controlling the thickness and component of the copper stibium alloy electroplated layer on the current collector in certain extent, all the steps are carried out under normal temperature, the reaction time is short and the energy consumption is low.

The invention relates to the technical field of inorganic materials, and discloses a preparation method for a ferrous carbonate/graphene composite material. The preparation method comprises the steps of: I. mixing graphene materials, water-soluble ferrite, urea and water to form a suspension, wherein the mass ratio of the graphene materials to the water-soluble ferrite is (0.02-0.2):1, and the amount-of-substance concentration ratio of the urea to the water-soluble ferrite is (20-100):1; II. putting the suspension into a reaction kettle, controlling the temperature to be 100-180DEG C, and carrying out hydrothermal reaction for 4-12h to obtain the ferrous carbonate/graphene composite material. The invention further provides a lithium ion battery prepared by taking the ferrous carbonate/graphene composite material as a negative electrode material. By being synthesized through low-temperature hydrothermal reaction, the ferrous carbonate/graphene composite material is high in specific capacity and good in cycling performance, and has excellent development prospects after being applied to the negative electrode materials of the lithium ion battery.

The invention discloses a flexible lithium-ion battery capable of working around the clock and a preparation method thereof. According to the battery, a membrane assembled by a stretched carbon nanotube macroscopic tube continuous body is taken as a current collector for positive and negative electrodes; and the membrane is subjected to porous treatment and electrolyte infiltration treatment in the membrane-forming process and an electrolyte can be stored into a carbon nanotube membrane as the current collector, so that the obtained battery still can normally work in harsh environments, such as extremely high temperature, extremely low temperature, vacuum and water. A battery main body comprises a positive electrode plate, a membrane and a negative electrode plate which are sequentially stacked. The invention further provides a preparation method of the battery. According to the flexible lithium-ion battery, the problem of a failure of an existing lithium-ion battery due to the fact that the current collector cannot store the electrolyte in the harsh environments can be effectively solved; the preparation process is in full integration with a production technology of an existing mainstream lithium-ion battery; mass production under existing production conditions is facilitated; and the flexible lithium-ion battery has very high practicability.