9results 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.

The application relates to the technical field of wireless charging and discloses an automatic power-off control method for a wireless charging system, which comprises the following steps: acquiring historical charging sample data; modeling capacity attenuation data by using a Weibull distribution to construct a Weibull distribution model; modeling overvoltage fault discrete data by using a beta distribution to construct a beta distribution model; fusing the Weibull distribution model and the beta distribution model to construct a hybrid loss function and calculate expected loss values under different off-voltages; selecting an off-voltage that makes the expected loss value minimum as an optimal off-voltage output; judging whether a real-time collected port voltage is less than the optimal off-voltage, if yes, the system normally charges and continuously monitors, otherwise, the system stops charging and shuts down; after charging is completed, characteristic data of this time of charging are recorded and updated; and the application solves the technical problem that a battery is overcharged or undercharged due to the adoption of a fixed voltage threshold.

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 discloses an ITO-free vertical partition flexible stretchable dimming film and a preparation method thereof, and belongs to the technical field of dimming films.The dimming film comprises a flexible transparent substrate, a patterned silver nanowire / organic polymer composite electrode layer and an electrochromic functional layer; the composite electrode layer is divided into 8-12 vertical partitions, each partition comprises a working electrode area and a counter electrode area which are insulated from each other, and all electrode leads are gathered at the lower edge of the film; an insulating isolation groove penetrating through the composite electrode layer and the electrochromic functional layer is arranged between adjacent partitions.The application replaces the traditional ITO electrode with an organic composite electrode, eliminates the ion horizontal crosstalk between partitions through a physical isolation groove, and combines a short-time overdrive pulse, a constant-current coulomb meter control and a constant-voltage maintenance driving strategy, so that the device has the flexibility, the stretchability, the high-precision independent partition control ability and the long cycle stability while maintaining the high transmittance and the low haze.

Disclosed is a positive electrode active material for improving the performance of an electrochemical device. The positive electrode active material comprises an overlithiated layered oxide (OLO), and has an R value (defined by Formula (1) R = (P A / P B ) of not more than 27. According to small-angle X-ray scattering analysis, in Formula (1), P A is the volume (cm 3 / g) of macro pores contained in the positive electrode active material, P B is the volume (cm 3 / g) of micro pores contained in the positive electrode active material, the macro pores have a maximum volume fraction in the pore radius range of 2 to 50 nm, and the micro pores have a maximum volume fraction in the pore radius range of 0.5 to 2 nm.

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.