6results about How to "Improve charging capacity" patented technology

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

This invention relates to a low-temperature charging method for lithium-ion batteries. The method includes acquiring constant-capacity data of the battery measured at room temperature, where n1, n2, and n3 represent the charging capacities corresponding to 25–35% SOC, 45–55% SOC, and 75–85% SOC, respectively, and aV, bV, and cV represent the corresponding voltages; preparing for charging at low temperature; charging to aV at a first-rate constant current, recording the capacity m1; determining whether the condition n1 / m1 ≥ 65% is met; if not, maintaining a constant voltage to 0.08–0.12C; if the condition is met, charging to bV at a second-rate constant current, recording the capacity m2; determining whether n2 / m2 ≥ 65% is met; if not, maintaining a constant voltage to 0.03–0.07C; if the condition is met, charging to cV at a rate of 0.33C, recording the capacity m3; determining whether n3 / m3 ≥ 65% is met; if not, maintaining a constant voltage to 0.08–0.12C; if the condition is met, charging at a third-rate constant current. This invention can improve charging capacity and charging efficiency, and improve or prevent lithium plating.

The invention provides a composite crystal lithium manganate material, a lithium ion battery and a preparation method, and relates to the technical field of lithium ion batteries. The composite crystal lithium manganate material is composed of a monoclinic layered structure, an orthogonal layered structure and a tetragonal distorted spinel structure according to different proportions. By regulating and controlling the proportion of the three crystal structures, stable lithium manganate and capacitive lithium manganate can be obtained, and the capacity or cycle performance of the material can be improved. And the preparation method of the composite crystal form lithium manganate material is simple, controllable in condition and suitable for large-scale production.

The application provides modified graphene and a preparation method and application thereof, the modified graphene has a structure shown in formula (I): wherein R1 is selected from any one of benzene, naphthalene, anthracene, phenanthrene, perylene, naphthacene, pyrene groups; R2 and R3 are each independently any one of H, -CH3 and -CH2CH3; m is 0, 1, 2, 3 or 4; n is 0, 1 or 2; the modified graphene provided by the application enables the carbon-coated aluminum foil to have the function of sodium storage, and can reduce the contact resistance of the carbon-coated aluminum foil and the positive electrode material, improve the peeling strength of the carbon-coated aluminum foil and the positive electrode material, and improve the battery charging capacity and cycle life.

The utility model discloses an electric vehicle storage battery charging and heating device which comprises a heating module, a temperature sensor arrangement module, an electric energy transmission module, a front heating device plate and a rear heating device plate. The device comprises a lower heating device plate, a peripheral temperature sensor, a central temperature sensor, a motor controller, a power supply plug, a central support, a wire, a temperature control valve, an annular heating ring and a central heating module. The temperature sensor and the motor controller monitor the environment temperature of the storage battery when an electric vehicle user begins to charge, and heat the storage battery during charging, so that the optimal activity temperature of the storage battery is achieved, the charging capacity of the storage battery is improved, and the service life of the electric vehicle is prolonged.

The application provides an electrolyte, a preparation method and application thereof, the electrolyte comprises an organic solvent, a lithium salt, an interface additive and a fluorine-containing diluent; the interface additive comprises a boric acid bis-sulfolactone compound; the boric acid bis-sulfolactone compound has a structure shown in formula I; in the application, the electrolyte is compounded by selecting a specific structure of the interface additive and the fluorine-containing diluent, so that the electrolyte has high conductivity, forms a unique high-voltage-resistant fast-charging electrolyte system, improves the high-voltage resistance and cycle performance of the battery, has higher charging capacity under the same condition, and has good fast-charging performance.