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Lithium ion cell, electrode of lithium ion cell and its preparation method

A lithium-ion battery and electrode technology, applied in battery electrodes, electrode manufacturing, electrode current collector coating, etc., can solve problems such as unsuitable coating, and achieve the effects of good bonding performance, low cost, and environmental friendliness

Active Publication Date: 2004-03-31
PULEAD TAIAN TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zheng Weizhong etc. (Chinese patent, publication number: CN1328102A) is CH with general formula 2 =CR 1 R 2 The hydrophilic monomer and the lipophilic monomer have prepared the polyacrylate water-based adhesive that can be applied to the lithium-ion battery pole piece coating as the initial polymerization monomer, can be applied to the coating of negative electrode graphite powder, and It has a certain improvement effect on the cycle performance of the battery, but it is not suitable for the coating of the positive electrode (such as lithium cobalt oxide) due to electrode polarization and other reasons

Method used

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  • Lithium ion cell, electrode of lithium ion cell and its preparation method
  • Lithium ion cell, electrode of lithium ion cell and its preparation method
  • Lithium ion cell, electrode of lithium ion cell and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 40 g of CMC lithium salt, dissolve it in 1000 ml of deionized water, add 80 g of styrene-butadiene emulsion (50% solid content), and add 5 g of vinyl tris (β-methoxyethoxy) silane coupling agent , Continue to stir to a homogeneous system, that is, water-based adhesive. Then the electrode was prepared as follows.

[0030] Weigh 180 grams of water-based adhesive, add 10 grams of carbon black, add 500 grams of composite graphite, stir evenly, add deionized water to adjust the viscosity to 8500 mPa·s, and apply it on both sides of the copper foil according to the battery’s conventional coating process. Rolling and slitting into negative electrode sheet;

[0031] Weigh 200 grams of water-based adhesive, add 5 grams of carbon black and 5 grams of graphite, and add 500 grams of LiCoO 2 After stirring uniformly, add deionized water to adjust the viscosity to 7000mPa·s, then apply it on both sides of the aluminum foil, roll it, and cut it into positive pole pieces.

[0032] Fo...

Embodiment 2

[0035] Weigh 5g of EMC lithium salt, dissolve it in 1000ml of deionized water, add 130g of styrene-butadiene emulsion (50% solid content), and add 40g of γ-aminopropyltriethoxysilane coupling agent, and continue to stir until A homogeneous system is a water-based adhesive. Then the electrode was prepared as follows.

[0036] Weigh 70 grams of water-based adhesive, add 3 grams of carbon black, add 500 grams of composite graphite, stir evenly, add deionized water to adjust the viscosity to 5000 mPa·s, and apply it on both sides of the copper foil according to the battery’s conventional coating process. Rolling and slitting into negative electrode sheet;

[0037] Weigh 80 grams of water-based adhesive, add 20 grams of carbon black and 30 grams of graphite, and add 500 grams of LiCoO 2 , After stirring uniformly, add deionized water to adjust the viscosity to 11000mPa·s, then apply it on both sides of the aluminum foil, roll and cut to make the positive pole piece.

[0038] Then the b...

Embodiment 3

[0040] Weigh 110 grams of HPMC lithium salt, dissolve it in 2000 milliliters of deionized water, add 40 grams of propylene benzene emulsion (50% solid content), 20 grams of N-dimethylaminotrimethoxysilane, and continue to stir until homogeneous The system is a water-based adhesive. Then the electrode was prepared as follows.

[0041] Weigh 800 grams of water-based adhesive, add 3 grams of carbon black, add 500 grams of MCMB, stir evenly, add deionized water to adjust the viscosity to 10000mPa·s, and apply it to both sides of the copper foil according to the battery's conventional coating process. Press and cut to make negative sheets;

[0042] Weigh 450 grams of water-based adhesive, add 20 grams of carbon black and 10 grams of graphite, and add 500 grams of LiCoO 2 , After stirring uniformly, add deionized water to adjust the viscosity to 9000mPa·s, then coat it on both sides of the aluminum foil, roll, and cut to make the positive pole piece.

[0043] Then the battery was assemb...

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Abstract

The invention refers to the electrodes of lithium ion battery and making method, as well as the lithium ion battery. Mix positive and / or negative active substrate powder 85-98%, electric agent 0.5-10%, and water-based adhesive 1.5-10% according to weight percentage, add in water to adjust into 4000-12000mPa*s plasm; smear the plasm on two surfaces of positive current collector aluminum foil and / or negative current collector copper foil; roll and slice to obtain the electrodes. It can be widely applied to the making field of lithium ion battery.

Description

Technical field: [0001] The invention relates to a lithium ion battery, in particular to an electrode of a lithium ion battery prepared with a water-based binder, a preparation method thereof, and a lithium ion battery using the electrode. Background technique: [0002] Since its introduction in 1990, lithium-ion batteries have become a new generation of rechargeable batteries with excellent performance, which are widely used in mobile phones, notebook computers, electric vehicles, power tools, etc., and gradually show great application prospects in aerospace, defense and other fields . Among them, the research of lithium-ion battery materials and processes has always been a research hotspot in this field. Lithium-ion batteries are mainly composed of positive pole pieces, negative pole pieces, separators, and electrolyte. The production of positive and negative pole pieces is generally to mix the positive and negative active materials, binders and conductive agents into a uniform...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M4/48H01M4/58H01M4/62H01M10/36H01M10/38H01M10/40
CPCY02E60/122H01M4/139H01M4/624H01M4/0404H01M10/0525H01M4/621Y02E60/10Y02P70/50
Inventor 周恒辉陈继涛孙杰
Owner PULEAD TAIAN TECH IND
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