30results about "Non-aqueous electrolyte accumulator electrodes" 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.

An all-solid lithium secondary battery has excellent reliability including safety. However, in general, its energy density or output density is lower than that achieved by liquid electrolyte systems.

The all-solid lithium battery includes a lithium ion-conducting solid electrolyte as an electrolyte. The lithium ion-conducting solid electrolyte is mainly composed of a sulfide, and the surface of a positive electrode active material is coated with a lithium ion-conducting oxide. The advantages of the present invention are particularly significant when the positive electrode active material exhibits a potential of 3 V or more during operation of the all-solid lithium battery, i.e., when redox reaction occurs at a potential of 3 V or more.

A nonaqueous electrolyte secondary battery having a positive electrode including a positive electrode active material, a negative electrode and a nonaqueous electrolyte comprising a solute dissolved in a solvent, the positive electrode active material is a mixture of a lithium-manganese composite oxide and a lithium-nickel composite oxide represented by LiNiaM11- aO2 (M1 being at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and a being 0<a<=1) and/or a lithium-cobalt composite oxide represented by LiCobM21- bO2 (M2 being at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Ni, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and being 0<b<=1), and the nonaqueous electrolyte contains a phosphoric ester and an ether or an ester having a halogen substituted phenyl.

The disclosed embodiments provide a battery cell. The battery cell includes a cathode current collector containing graphene, a cathode active material, an electrolyte, an anode active material, and an anode current collector. The graphene may reduce the manufacturing cost and/or increase the energy density of the battery cell.

A non-aqueous electrolyte battery according to the present invention is a non-aqueous electrolyte battery including: a positive electrode including a positive collector and a positive active material containing layer formed on the positive collector; a negative electrode including a negative collector and a negative active material containing layer formed on the negative collector; and a separator provided between the positive electrode and the negative electrode. The positive electrode has a positive collector exposed portion at a part of the positive collector, on which the positive active material containing layer is not formed. An insulating resin film formed of a base substance of a heat resistant resin having a heat resistant temperature of 150° C. or more, the resin film containing a thermoplastic resin therein, is provided at a portion where the positive collector exposed portion and the negative active material containing layer are opposed to each other with the separator positioned therebetween.

A negative electrode current collector for a non-aqueous electrolyte secondary battery comprising copper or a copper alloy, characterized in that the copper or copper alloy has a ratio I200/I111 of an intensity I200 of a peak attributed to (200) plane to an intensity I111 of a peak attributed to (111) plane, which satisfies the equation (1): 0.3<=I200/I111<=4.0 (1) in an X-ray diffraction pattern measured using CuKalpha radiation as a radiation source.

An electrode comprises a conductor and an electrode coating, said electrode coating comprising as electronically active material a transition metal (T) oxidenitride of formula Li_xT^I_mT^II_nN_yO_z form of nanoparticles, wherein x=0-3, y+z=2-4, y>0, z>=0.25, m+n=1, m=0-1, n=0-1, T^I and T^II both being transition metals of the groups IVB, VB, VIB and VIIB, and periods 3d, 4d and 5d, in particular transition metals selected from Zr, Nb, Mo, Ti, V, Cr, W, Mn, Ni, Co, Fe and Cu. Dependent on the kind of transition metal, its oxidation state and the Li content, such materials may be used as anode materials or as cathode materials, respectively.

Provided is a process for producing a rope-shaped alkali metal battery, comprising: (a) providing a first electrode comprising a first conductive porous rod and a first mixture of a first electrode active material and a first electrolyte residing in the pores of the first porous rod; (b) wrapping or encasing a porous separator around the first electrode to form a separator-protected first electrode; (c) providing a second electrode comprising a second conductive porous rod and a second mixture of a second electrode active material and a second electrolyte residing in the pores of the second porous rod; (d) combining the separator-protected first electrode and second electrode to form a braid or a yarn having a twist or spiral electrode; and (e) wrapping or encasing a protective casing or sheath around the braid or yarn to form the rope battery.

The invention discloses method for improving the low-temperature performance of a lithium iron phosphate anodic material for lithium batteries and lithium batteries. The method is to add lithium cobaltate into the formula of the lithium iron phosphate anodic material for lithium batteries. In the invention, based on the characteristic that the low-temperature discharging performance of the lithium cobaltate is high, the problem of low-temperature performance of the conventional lithium iron phosphate batteries is solved, the conventional production process is not changed, and the lithium iron phosphate batteries with high low-temperature performance are manufactured. In the invention, by optimizing and screening the added amount of lithium cobaltate, the low-temperature discharging volume retention rate is increased, the discharging time is prolonged, and better effect is obtained.

Disclosed are copper foil or net comprising a Cu-nitrile compound complex formed on the surface thereof, a method for preparing the same, and a lithium secondary battery that comprises an electrode using the same copper foil or net as a collector. The lithium secondary battery, which uses a copper collector comprising a Cu-nitrile compound complex formed on the surface thereof through the application of a certain voltage level, can prevent the corrosion of Cu occurring at a voltage of 3.6V or higher under overdischarge conditions away from the normal drive condition, and thus can significantly improve the capacity restorability after overdischarge.

A method of producing a powder mass for a lithium battery, the method comprising: (a) mixing graphene sheets and an elastomer or its precursor in a liquid medium or solvent to form a suspension; (b) dispersing a plurality of particles of an anode active material in the suspension to form a slurry; and (c) dispensing the slurry and removing the solvent and/or polymerizing/curing the precursor to form the powder mass, wherein the powder mass comprises multiple particulates of the anode active material, wherein at least one of the particulates is composed of one or a plurality of the particles encapsulated by a thin layer of graphene/elastomer composite having a thickness from 1 nm to 10 μm, a lithium ion conductivity from 10⁻⁷ S/cm to 10⁻² S/cm and an electrical conductivity from 10⁻⁷ S/cm to 100 S/cm.

An organic electrolytic solution containing a lithium salt, an organic solvent, and an oxalate compound, and a lithium battery using the organic electrolytic solution are provided. Due to the oxalate compound, the organic electrolytic solution stabilizes lithium metal and improves the conductivity of lithium ions. Also, the organic electrolytic solution present invention improves charging/discharging efficiency when used in lithium batteries having a lithium metal anode. Especially when the organic electrolytic solution is used in lithium sulfur batteries, the oxalate compound forms a chelate with lithium ions and improves the ionic conductivity and the charging/discharging efficiency of the battery. In addition, due to the chelation of the lithium ions, negative sulfur ions remain free without interaction with lithium ions, are highly likely to dissolve in an electrolytic solution. As a result, a reversible capacity of sulfur is improved.

The invention discloses a lithium battery core with conductive electrode lugs. The lithium battery core comprises an electrode sheet, wherein an electrode lug part is arranged on one side of the electrode sheet, the electrode sheet comprises an electrode sheet insulating layer and electrode sheet metal layers located on the two sides of the electrode sheet insulating layer, an active substance layer is arranged on the side, away from the electrode sheet insulating layer, of each electrode sheet metal layer, the electrode lug part comprises at least one electrode lug bundle fixedly connected with the electrode sheet, the electrode lug bundle comprises at least one electrode lug sheet, the electrode lug sheet comprises an electrode lug insulating layer and electrode lug metal layers arrangedon the two sides of the electrode lug insulating layer, the electrode lug insulating layer is fixedly connected with the electrode sheet insulating layer, the electrode lug metal layer is fixedly connected with the electrode sheet metal layer, and the electrode lug sheets in the electrode lug bundle are conducted through a conductive foil material. According to the battery core structure disclosed by the invention, the conductive connection of the electrode lugs is realized in a manner of welding a conductive foil material on the electrode lugs, so that compared with a traditional manner, theuse amount of the foils can be greatly reduced, the production cost is reduced, and the energy density of the battery is remarkably improved.

An electrode for a lithium secondary battery, a lithium secondary battery using the same and a method for manufacturing the same are provided. The electrode for a lithium secondary battery comprises: a current collector; an electrode active material layer located on the current collector; and inorganic particles having two or more radical polymerization functional groups are dispersed on the electrode active material layer. Accordingly, since a polymerization reaction can directly occur between monomers and the inorganic particles in a precursor solution when a polymer electrolyte is formed by in-situ polymerization, an interface between the electrode and the electrolyte can be improved. In addition, the distribution of the polymer electrolyte within the electrode can be uniform. Therefore, improved life and highly efficient discharging can be exhibited when charging and discharging the lithium secondary battery.

The invention discloses a safety battery which comprises a base material. The outer surface of the base material is coated with a positive electrode slurry or a negative electrode slurry, a positive electrode or a negative electrode of the battery is correspondingly formed, a safety additive is added into the positive electrode or the negative electrode of the battery, and the use amount of the safety additive is correspondingly 0.1-20% of the use amount of the positive electrode slurry or the negative electrode slurry. The safety additive is made of a foaming agent material or an expansion material or a PTC material. When a short circuit occurs in the battery, the added safety additive enables an active agent and a current collector to be stripped and loosened or enables materials to be loosened through a physical or chemical reaction so that a current channel is cut off, electronic conductivity is blocked, further occurrence of failure is hindered, and the safety performance is improved.

The invention relates to a lithium-ion battery negative electrode material and a preparation method of the lithium-ion battery negative electrode material. The preparation method comprises the following steps of: preparing a silicon-based precursor ceramic cross-linking body by a precursor method, forming ceramic by pyrolysis; introducing a carbon-containing compound in the pyrolysis process of the cross-linking body; after the carbon-containing compound cracks, forming carbon-containing micromolecules to coat ceramic particles of the precursor; and then mixing the carbon-coated ceramic particles of the precursor and graphite according to the proportion, and obtaining the lithium-ion battery negative material. The lithium-ion battery negative electrode material obtained according to the invention has the advantages that the first-time reversible capacity is 1252mAh/g, the first-time efficiency is 95%, 90% of the capacity can be maintained still after 200-time circulation, and the charging and discharging performances are excellent.

The invention discloses a negative plate of a multi-element nano vanadium power battery and a preparation method for the negative plate of the multi-element nano vanadium power battery. The plate comprises a negative current collector of which the upper and lower surfaces are sequentially provided with a middle thin layer and an active outer layer from inside to outside respectively. In the negative plate of the multi-element nano vanadium power battery and the preparation method for the negative plate of the multi-element nano vanadium power battery, the upper and lower rough surfaces of the negative current collector are sequentially provided with the middle thin layer and the active outer layer from inside to outside respectively, and the middle thin layer is 1 to 5 microns thick and comprises components which are substantially the same as those of the active outer layer, so that adhesive forces between the middle thin layer and the negative current collector and between the middle thin layer and the active outer layer are strong, the powder dropping phenomenon of the negative plate of the multi-element nano vanadium power battery is effectively prevented, and the service life of the negative plate of the multi-element nano vanadium power battery is prolonged.

The invention provides a lithium battery negative electrode which is composed of a lithiophilic coating and a current collector, wherein the lithiophilic coating comprises a lithiophilic agent, a lithium layer binding agent, a conductive agent and a binding agent; the lithiophilic agent comprises a metal sulfide, a metal oxide, nano Ni4P5 and nano metal; and the lithium layer binding agent is montmorillonite powder. The surface of the current collector is coated with the lithiophilic coating containing the lithiophilic agent and the lithium layer binding agent to manufacture the lithium battery negative electrode, the technical problem that dead lithium is easily formed in the charging and discharging process of the negative electrode is solved through the synergistic effect of the lithiophilic agent and the lithium layer binding agent, and by adopting the lithium battery negative electrode, the Coulombic efficiency and the reversible capacity of the battery can be effectively improved. The invention also provides a preparation method of the lithium battery negative electrode and a battery containing the negative electrode.

A method for preparing a negative electrode active material for a lithium secondary battery according to one aspect of the present invention comprises the steps of: uniformly mixing silicon and metal oxide; and heating or ball-milling the mixture.

The embodiment of the invention relates to a flexible battery and a preparation method thereof, relates to the technical field of batteries, and mainly aims to improve the applicability of a lithium ion battery. According to the main technical scheme, the preparation method of the flexible battery comprises the following steps: a flexible frame is arranged at the periphery of a pole group fixing region on the inner surface of a first flexible film layer; a body part of a battery pole group is arranged in the flexible frame; and the inner surface of a second flexible film layer and the inner surface of the first flexible film layer are arranged opposite to each other and sealed to form a flexible wrapping film, the flexible wrapping film wraps the body part of the battery pole group betweenthe inner surface of the first flexible film layer and the inner surface of the second flexible film layer, and an electrical connection terminal part of the battery pole group extends out of the flexible wrapping film. Compared with the prior art, the battery pole group adopts the flexible wrapping film, and the battery pole group is positioned through the flexible frame arranged on the inner surface of the first flexible film layer in the flexible wrapping film, so that a flexible battery can be prepared, and the requirement of flexible electronic equipment for a bendable battery can be met.

An electronically active glass has the composition (T_xO_y)_z-(M_uO_v)_w—(Na/LiBO₂)_t wherein

• • T is a transition metal selected from V and Mo,
  • M is a metal selected from Ni, Co, Na, Al, Mn, Cr, Cu, Fe, Ti and mixtures thereof,
  • x, y, u, and v are the stoichiometric coefficients resulting in a neutral compound, i.e. x=2y/(oxidation state of T) and u=2v/(oxidation state of M),
  • z, w and t are weight-%, wherein
  • z is 70-80,
  • w is 0-20
  • t is 10-30, and
  • the sum of z, w and t is 100 weight-%, in particular V₂O₅—LiBO₂ and V₂O₅—NiO—LiBO₂.

The invention relates to the technical field of lithium ion batteries, and discloses a pole piece structure of a lithium battery and a polymer soft package lithium battery in order to solve the technical problem that an existing product is low in rate capability, a pole piece comprises a positive pole piece and a negative pole piece, the pole piece is provided with a current collector, the current collector is coated with an active material, and the active material is a polymer soft package lithium battery. A gap for welding the drainage body is reserved in the middle of the pole piece, an active substance is vacant in the gap, and the drainage body is welded on the current collector in an ultrasonic manner. The head super-welding drainage bodies of the positive and negative pole pieces are changed into middle welding, the head and the tail are both active substances, compared with an existing structure, the covering area of the active substances can be increased, the internal resistance of the battery is reduced, the current density is increased, the charge transfer speed is increased, and therefore the energy density and the rate charge-discharge performance of the battery are improved.

The invention discloses a positive electrode slurry, which comprises a solid component and a solvent, and is characterized in that the solid component comprises a positive electrode material, a conductive agent, a binder and a positive electrode additive; wherein the positive electrode material is lithium iron phosphate; the positive electrode additive is boric acid; the conductive agent is conductive carbon black SP; wherein the binder is polyvinylidene fluoride (PVDF); wherein the solvent is N-methyl pyrrolidone. The invention discloses a preparation method for the positive electrode slurry,a positive electrode plate and a lithium iron phosphate battery. Boric acid is used as the positive electrode additive in the components of the positive electrode slurry, so that the high-temperaturecycle and the storage performance of the lithium iron phosphate battery can be improved, and the positive electrode slurry has important production practice significance.