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Preparation method of lithium ion battery with high charging performance

A lithium-ion battery, high-performance technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems that batteries are difficult to adapt to high-current charging characteristics, affect customer experience, and take a long time to charge, so as to reduce terminal charging time , Improve safety performance, high energy density effect

Pending Publication Date: 2021-07-27
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as a traditional negative electrode material, graphite, due to its own structural problems, it is difficult for the battery to adapt to the characteristics of high-current charging, that is, the double charging performance is poor, and the charging time for terminal use is long, which seriously affects the customer experience. How to improve it safely and effectively? The charging rate of lithium-ion batteries has always been a difficult problem for industry personnel to explore

Method used

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  • Preparation method of lithium ion battery with high charging performance
  • Preparation method of lithium ion battery with high charging performance
  • Preparation method of lithium ion battery with high charging performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of a lithium-ion battery with high charging performance, comprising the steps of:

[0041] S1. Preparation of positive electrode sheet: Stir lithium iron phosphate, conductive carbon black, graphene, carbon nanotubes, and polyvinylidene fluoride in N-methylpyrrolidone at a mass ratio of 95:2:2:1:2, and pump Vacuum defoaming, viscosity adjustment, sieve with a 150-mesh sieve, evenly spread the sieved slurry on the front and back sides of a 12μm aluminum foil, and then roll it (compaction density 2.45g / cc), mold Cut and place in the oven to bake;

[0042] Among them, the cathode material preparation process is as follows:

[0043] (1) Stir the polyvinylidene fluoride in N-methylpyrrolidone for 2.5h until the polyvinylidene fluoride is completely dissolved;

[0044] (2) Add conductive carbon black and vacuumize and stir for 35min, then add graphene and carbon nanotubes, vacuumize and stir for 35min;

[0045] (3) Divide lithium iron phosphate into the ...

Embodiment 2

[0056] A preparation method of a lithium-ion battery with high charging performance, comprising the steps of:

[0057] S1. Preparation of positive electrode sheet: Stir lithium manganate, conductive carbon black, graphene, carbon nanotubes, and polyvinylidene fluoride in N-methylpyrrolidone at a mass ratio of 96:1:1:1:1, and pump Vacuum defoaming, viscosity adjustment, sieve with a 200-mesh sieve, evenly spread the sieved slurry on the front and back sides of 12μm aluminum foil, and then roll it (compaction density 2.45g / cc), die Cut and place in the oven to bake;

[0058] Among them, the cathode material preparation process is as follows:

[0059] (1) Stir the polyvinylidene fluoride in N-methylpyrrolidone for 3 hours until the polyvinylidene fluoride is completely dissolved;

[0060] (2) Add conductive carbon black and vacuumize and stir for 40min, then add graphene and carbon nanotubes, vacuumize and stir for 30min;

[0061] (3) Divide lithium iron phosphate into the abo...

Embodiment 3

[0072] A preparation method of a lithium-ion battery with high charging performance, comprising the steps of:

[0073] S1. Preparation of positive electrode sheet: Stir lithium cobaltate, conductive carbon black, graphene, carbon nanotubes and polyvinylidene fluoride in N-methylpyrrolidone according to the mass ratio of 94:1:3:1:1, and pump Vacuum defoaming, viscosity adjustment, sieve with a 100-mesh sieve, evenly spread the sieved slurry on the front and back sides of a 12μm aluminum foil, and then roll it (compaction density 2.45g / cc), mold Cut and place in the oven to bake;

[0074] Among them, the cathode material preparation process is as follows:

[0075] (1) Stir the polyvinylidene fluoride in N-methylpyrrolidone for 2 hours until the polyvinylidene fluoride is completely dissolved;

[0076] (2) Add conductive carbon black and vacuumize and stir for 30min, then add graphene and carbon nanotubes, vacuumize and stir for 30min;

[0077] (3) Divide lithium iron phosphat...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium ion battery with high charging performance. The method comprises the following steps of S1, preparing a positive plate; S2, preparing a negative plate, namely uniformly stirring a mixture of artificial graphite and a composite material TiO2@MoS2, a conductive agent III, a thickening agent and a negative electrode binder in a dispersing agent, vacuumizing, defoaming, sieving, uniformly coating the front surface and the back surface of a copper foil with the mixture, and placing the copper foil in an oven for baking after rolling and die cutting; and S3, assembling the positive plate, the negative plate and a diaphragm into a battery cell, injecting electrolyte, sealing, forming and grading to obtain the lithium ion battery. According to the invention, the TiO2@MoS2 composite material is mixed with the traditional artificial graphite to prepare the battery negative electrode, so that the multiple charging performance of the lithium ion battery can be effectively improved; and the prepared battery cell is nonflammable, so that a lithium precipitation phenomenon of a negative electrode can be effectively avoided, and the safety performance of the battery cell is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a lithium-ion battery with high charging performance. Background technique [0002] As a secondary battery widely used in the market, lithium-ion batteries are being valued by governments around the world because of their non-toxicity, long life, and good weather resistance. At the same time, with the accelerated entry of various types of capital, Lithium-ion battery market is bound to have more sustainable prosperity and development. [0003] However, as a traditional negative electrode material - graphite, due to its own structural problems, it is difficult for the battery to adapt to the characteristics of high-current charging, that is, the double charge performance is poor, and the charging time for terminal use is long, which seriously affects the customer experience. How to improve it safely and effectively? The charging r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/58H01M4/587H01M4/62
CPCH01M10/058H01M10/0525H01M4/5815H01M4/587H01M4/62Y02P70/50Y02E60/10
Inventor 许伟周翠芳张萍陈飞叶青孟丹丹李明钧周建中
Owner TIANNENG SAFT ENERGY JOINT CO
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