52results about "Li-accumulators" 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.

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.

The invention discloses a composite electrolyte membrane based on a functional polymer. The composite electrolyte membrane is mainly composed of a polymer porous diaphragm, a lithium perfluoro-sulfonamide single-lithium ion type polymer electrolyte coating which coats one side of the polymer porous diaphragm and a gel polymer coating which coats the other side of the polymer porous diaphragm, is stable to a lithium negative electrode and has a free radical capture function. A preparation method for the composite electrolyte membrane comprises the following steps: reacting a perfluoro-sulfuryl fluoride resin with lithium methide containing double electron-withdrawing groups so as to obtain a lithium perfluoro-sulfonamide polymer; carrying out washing and dissolving, then coating one side of the polymer porous diaphragm with the lithium perfluoro-sulfonamide polymer and adding a non-solvent for secondary film formation; and coating the other side of the polymer porous diaphragm with a gel polymer system which is stable to the lithium negative electrode, contains an additive and comprises a mixed liquor of a polymer, a solvent, a free radical annihilation effect additive and a nanometer filling material, and then carrying out drying so as to prepare the composite electrolyte membrane. The composite electrolyte membrane can improve cycling stability of a lithium-sulfur secondary cell.

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.

The present invention relates to a battery module, which includes one or more battery cell units, and the battery cell unit includes a battery cell, a fixing member located surrounding an outer circumference surface of the battery cell, and a heat absorbing material located between the battery cell and the fixing member, and as a result, heat generation inside the battery module is suppressed, and ignition between the series-connected battery cell units may be suppressed. Accordingly, excellent charge and discharge efficiency, an excellent cycle property and a lifespan property of the battery may be exhibited without concern for explosion or ignition of the battery module.

A method of making an intermetallic negative electrode for an electrochemical cell. One or more metal salts is dissolved in an organic solvent forming a solution to which is added a metal reducing agent to form an intermetallic compound. Thereafter, the intermetallic compound precipitates and is separated and formed into an electrode. The electrodes are useful in electrochemical cells and batteries.

The invention discloses a lithium-sulfur battery electrolyte with high safety and high performance. The electrolyte is prepared from three components as follows: 0.1-10 mol/L of lithium salt, a fluoro cyclic and/or chain-like carbonate ester compound organic solvent and other functional additives. The electrolyte is quite stable for lithium polysulfide, and the problem about reaction of common carbonate ester solvents and lithium polysulfide is solved; meanwhile, the fluorine element has a good flame retardant property and the safety performance of the lithium-sulfur battery adopting the electrolyte can be remarkably improved.

Provided is a lithium ion secondary battery positive electrode active material with excellent cycle characteristics and rate characteristics even when charging has been performed at high voltages. This lithium ion secondary battery positive electrode active material comprises particles (III) having, on the surface of a lithium-containing composite oxide, a covering layer containing a metal oxide (I) comprising at least one metallic element chosen from the group consisting of group 3 elements, group 13 elements and lanthanoids in the period table, and a compound (II) containing Li and P, and is characterized in that the atomic ratio (P/metallic elements) of the particles (III) in the layer within 5nm of the surface is 0.03-0.45.

The invention discloses a preparation method of special alumina for high-purity lithium battery separation membranes. The preparation method comprises: preparing boehmite by using aluminum hydroxide as a raw material, using ultrafine aluminum hydroxide as a seed crystal, using ammonia water as an additive and using soft water as a reaction medium through a hydrothermal reaction; carrying out hightemperature calcination on the boehmite to obtain alpha-Al2O3 raw powder; and grinding the alpha-Al2O3 raw powder by a horizontal sander, and carrying out spray drying, or grinding by a jet mill to obtain the alumina for lithium battery separation membranes. According to the present invention, sodium oxide impurities can be removed through the hydrothermal reaction; and the obtained alumina has characteristics of high chemical purity, controllable crystal micro-morphology and relatively narrow particle size distribution, has the Al2O3 content of more than or equal to 99.95%, has the Na2O content of less than or equal to 0.02%, has the contents of impurities such as Fe2O3 and the like of less than or equal to 70 ppm, mainly has spherical and cubic structure, has a specific surface area of 3.5-6.0 m<2>/g, and can meet the requirements of electrochemical performance and safety performance of lithium battery separation membrane materials.

The invention discloses a high-specific-energy flexible integrated electrode and a preparation method therefor. The electrode is prepared from the following components based on mass percentage: 20-80% of graphene, 0-10% of conductive carbon black, and 10-80% of sulfur-containing material, wherein the content of the conductive carbon black is not zero; the graphene and the conductive carbon black form a flexible graphene/conductive carbon black self-supporting thin film; and the sulfur-containing material is elementary sulfur or -S<m->-structured polysulfide, wherein m is greater than 2. By virtue of the high-specific-energy flexible integrated electrode prepared by the invention, the utilization rate of sulfur in the electrode is improved; in addition, the high-specific-energy flexible integrated electrode is high in conductivity and mechanical performance, capable of effectively relieving volume expansion of an active material in the charge-discharge process, and capable of improving the cycle performance and high specific energy characteristic of a battery.

The invention belongs to the technical field of solid electrolyte membranes for all-solid-state lithium batteries, and particularly relates to an application of a functionalized quantum dot compositesolid electrolyte membrane to the field of the all-solid-state lithium batteries. The functionalized quantum dot composite solid electrolyte membrane is prepared by selecting polyethylene oxide (PEO)as a polymer matrix, performing co-mixing and microwave-assisted reaction on polyethylene glycol diglycidyl ether (PEGDGE), diethylenetriamine and a citric acid aqueous solution to prepare PEGDGE functionalized carbon quantum dots as fillers, co-mixing PEGDGE functionalized carbon quantum dot dispersion liquid, Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and the PEO to prepare a membrane casting solution, and performing a casting method. The prepared functionalized quantum dot composite solid electrolyte membrane shows more excellent lithium ion conductivity and mechanical property compared with a traditional PEO electrolyte membrane.

A method for producing a slurry for a heat-resistant layer for a lithium ion secondary battery, including: a step of producing a polymer aqueous dispersion by polymerizing a monomer in an aqueous medium to give a polymer aqueous dispersion containing a polymer with a polymerization conversion rate of 90 to 100%, a step of obtaining a mixed solution by mixing N-methylpyrrolidone and the polymer aqueous dispersion, a step of obtaining a binder composition by removing an unreacted monomer and the aqueous medium from the mixed solution, and a step of obtaining a slurry by dispersing non-conductive microparticles in the binder composition, wherein the step of obtaining the binder composition includes removing the aqueous medium and the unreacted monomer by using a distillation column under a reduced pressure so that the binder composition contains the unreacted monomer and a water content in predetermined amounts.

The invention discloses a graphene/functionalized metal-organic framework material composite intercalation as well as a preparation method and application thereof. The graphene/functionalized metal organic framework material composite intercalation is prepared by taking a metal-organic framework material and graphene in a certain ratio as main bodies, and is placed on the cathode side of a non-polar diaphragm of a lithium-sulfur battery, so electrolyte absorption and lithium ion diffusion can be promoted, interface impedance is effectively reduced, polysulfide is adsorbed to limit the diffusion of the polysulfide, the shuttle effect of the polysulfide is inhibited, and the loss of active substances is reduced; the assembled lithium-sulfur battery is high in capacity and slow in attenuationat high multiplying power and shows excellent cycling stability and multiplying power performance; and the intercalation can be widely applied to lithium-sulfur batteries.

An electrode material for a secondary battery and a secondary battery are provided. The electrode material for the secondary battery includes tin-manganese-nickel-oxide. The secondary battery includes a cathode, an anode, an electrolyte, and a package structure, wherein the anode includes the electrode material for the secondary battery.

Positive electrode active material particle powder includes lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 4 μm to 20 μm, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape in which each (111) plane thereof is adjacent to at least one (100) plane thereof.

A rechargeable lithium battery includes: a negative electrode including a negative active material; a positive electrode; a separator interposed between the negative electrode and the positive electrode; and an electrolyte solution including an additive, wherein the negative active material includes a Si-based material, the Si-based material is included in an amount from about 1 to about 70 wt % based on total amount of the negative active material, and the additive includes fluoroethylene carbonate and a compound represented by the following Chemical Formula 1.

In the above Chemical Formula 1, R¹ to R³ are each independently a substituted or unsubstituted C2 to C5 alkyl group.

The invention discloses a composite cathode of a microbial fuel cell and a preparation method thereof. The composite cathode in turn comprises a catalytic layer, a carbon cloth layer, a carbon base layer and a diffusion layer from one side to the other side; and the material of the catalytic layer is a mixture of a graphene oxide / magnesium oxide composite material, activated carbon and perfluorinated sulfonic acid. The composite cathode of the microbial fuel cell is prepared from the magnesium oxide / graphene oxide composite material. Compared with noble metal platinum and alloy materials thereof, the raw materials of the composite cathode of the microbial fuel cell are wide in source and low in price, and the prepared composite cathode has a large surface area, excellent conductivity and stable electronic migration, can be used in microbial fuel cells, has low cost, stable operation and high output power, and can be widely used in the microbial fuel cells, lithium batteries or super capacitors.

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.

Nonaqueous electrolyte solvents or additives include components synthesized for advanced rechargeable batteries using diversified chemistries to achieve high energy densities. The electrolyte components are generated to create the formation of protective interphases on both cathode and anode surfaces simultaneously. The electrolyte components integrate the key structural elements into a single molecule, thus rendering the stabilization of electrode/electrolyte interfaces more efficiently and with parasitic reactions minimized. The electrolyte components have several applications in diversified battery chemistries such as Li-ion of high voltage and high capacity as well as beyond Li-ion (e.g., Li/sulfur, Na and Mg ion as well as conversion-reaction).