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Li-ion secondary battery anode preparation method

A secondary battery and lithium ion technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of complex process, high energy consumption, low energy consumption, etc., and achieve the effect of low cost and simple process

Inactive Publication Date: 2008-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of complex process and high energy consumption in the recycling method of positive electrode residual products and positive electrode scraps in the prior art, and provide a method for preparing the positive electrode of a lithium-ion secondary battery, which can not only recover positive electrode residual products and positive electrode cut pieces The leftover materials are recycled, and the process is simple and the energy consumption is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example illustrates the positive electrode preparation method provided by the present invention.

[0027] Soak 800 grams of positive electrode scraps with 400 grams of N-methylpyrrolidone at room temperature for 2 hours, and filter the mixture of dispersant and positive electrode scraps through a sieve with 180 microns of mesh to obtain 680 grams of filtrate that contains positive electrode material. The positive active material on the leftover material of the positive electrode is lithium cobalt oxide, the binder is polyvinylidene fluoride, and the conductive agent is acetylene black; the slurry containing the positive electrode material is evenly coated to a thickness of On both sides of an 18-micron aluminum foil, the weight ratio of the slurry containing the positive electrode material to the current collector was 9:1. After vacuum heating and drying at 125°C for 1 hour, calendering under a pressure of 2.0 MPa, and cutting into pieces to obtain a positive elect...

Embodiment 2

[0033] This example illustrates the positive electrode preparation method provided by the present invention.

[0034] In a JB-90 model 5-liter stirrer (Beijing Luye Tongda Experimental Instrument Equipment Co., Ltd.), stir the mixture of 600 grams of N, N-dimethylformamide and 800 grams of positive electrode scraps at 75 ° C for 2 hours, 150 microns The sieve filter dispersant of mesh and the mixture of positive electrode scraps, obtain 1285 grams of filtrate that is the slurry that contains positive electrode material, the positive electrode active material on the positive electrode scraps is lithium cobalt oxide, binder is polybias Ethylene difluoride, conductive agent is acetylene black; This slurry that contains positive electrode material is coated on both sides of the thick 18 micron aluminum foil with drawing machine, makes the slurry that contains positive electrode material and the weight ratio of current collector be 9 : 1. After vacuum heating and drying at 125°C f...

Embodiment 3

[0036] This example illustrates the positive electrode preparation method provided by the present invention.

[0037] Use a JU-6106 ultrasonic oscillator (Shanghai Jie Enpu Ultrasonic Equipment Co., Ltd.) to treat 300 grams of dimethyl sulfoxide and 900 grams of positive electrode scraps at room temperature for 1 hour at 100 kHz, and filter and disperse them through a sieve with a mesh size of 100 microns. The mixture of the agent and the positive electrode scraps to obtain 1290 grams of filtrate that is the slurry containing the positive electrode material, the positive active material on the positive electrode scraps is lithium cobalt oxide, the binding agent is styrene-butadiene rubber, and the conductive agent is carbon black ; The slurry containing the positive electrode material is evenly coated on both sides of an aluminum foil with a thickness of 18 microns with a pulper, so that the weight ratio of the slurry containing the positive electrode material to the current co...

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Abstract

The invention relates to a preparation method of an anode in a potassium ion secondary battery. The method comprises the following process: the sizing agent containing the anode material is coated, dried, calendered and slitted on the integrated body. The sizing agent containing the anode material comprises the anode material and a dispersant; at least part of the sizing agent containing the anode material is the sizing agent containing the anode material which is recycled from the anode damaged articles and / or the rim leftover of the anode slitting by the dispersant. The invention uses the dispersant to recycle the anode material from the anode damaged articles and / or the rim leftover of the anode slitting to obtain the sizing agent containing the anode material to be directly used for preparing the anode of the battery. The invention has the advantages of simple process and low cost.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode of a battery, in particular, the invention relates to a method for preparing a positive electrode of a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary battery refers to an ion battery composed of two compounds that can reversibly intercalate and deintercalate lithium ions as positive and negative electrodes. Because of its high specific energy, high working voltage, wide working temperature range, low self-discharge rate, long cycle life, no pollution, light weight, good safety performance, etc., it has a wide range of applications. [0003] Lithium-ion secondary batteries generally comprise a battery case and an electrode group and an electrolyte that are sealed in the battery case; the electrode group includes a positive pole, a negative pole, and a diaphragm between the positive pole and the negative pole; the positive pole includes a positive ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCY02E60/10
Inventor 史国强
Owner BYD CO LTD