Lithium ion battery and combination electrode used for the same and production method thereof

A lithium-ion battery and composite electrode technology, which is applied in electrode manufacturing, secondary batteries, active material electrodes, etc., can solve problems such as large environmental pollution, and achieve the effects of low price, fast liquid absorption speed, and high liquid absorption rate

Active Publication Date: 2008-08-20
CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, toluene is used as the reaction medium in the synthesis and preparation of polyacrylonitrile colloids, and there is a big problem of environmental pollution during the film formation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] 1. Preparation of aqueous polymer colloidal emulsion

[0043] Specific preparation method:

[0044] a. Add water to water-soluble polymer and hydrophilic monomer, heat and stir until completely dissolved;

[0045] b. At a temperature of 30-90°C, sequentially add the hydrophobic monomer and the initiator to the solution prepared in step a once, dividedly or dropwise, and polymerize for 4-35 hours, preferably 5-20 hours. Obtain an aqueous polymer colloidal emulsion;

[0046] The weight ratio of each raw material of the water-based polymer colloidal emulsion is: 100 parts of water-soluble polymer, 0-200 parts of hydrophilic monomer, 30-500 parts of hydrophobic monomer, and 1-5 parts of initiator;

[0047] Wherein, the water-soluble polymer is polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone or polyvinylpyrrolidone water-soluble copolymer; the degree of polymerization of polyvinyl alcohol is between 1700-2400, and the degree of hydrolysis is 50-99 , polyvinylp...

Embodiment 1

[0068] Example 1 Preparation of composite electrode sheet with microporous coating of the present invention

[0069] Synthesis of the first step aqueous polymer colloidal emulsion

[0070] In this example, polyvinyl alcohol (PVA) 1750 and lipophilic monomer vinyl acetate (VAc) / ethyl acrylate (EA) / acrylonitrile (AN) were grafted and copolymerized in the water phase to produce a The aqueous polymer colloid emulsion of diaphragm, its copolymer composition is PVA: Vac: EA: AN=10: 2: 2: 5 (weight ratio, the same below), the copolymer content is 17%, and the product is white opaque emulsion.

[0071] The specific preparation method of this water-based polymer colloidal emulsion is: in the four-port reaction vessel with condensed water, add 1000 parts of distilled water and 100 parts of polyvinyl alcohol (PVA) 1750, the reaction kettle is heated up to 75 ℃, stirring and dissolving, the rotating speed is 100 rpm, after 3 hours, when the material is transparent, it can be considered a...

Embodiment 2

[0077] Example 2 Preparation of composite electrode sheet with microporous coating of the present invention

[0078] The first step of colloidal emulsion synthesis

[0079] In this embodiment, lipophilic monomer styrene (St) / butyl acrylate (Ba) / acrylonitrile (AN) is added to polyvinylpyrrolidone (PVP) aqueous solution to carry out ternary copolymerization in the water phase, and the copolymerization composition is PVP:St:Ba:AN=10:2:4:2 (weight ratio), the copolymer content is 15%.

[0080] The water-based polymer emulsion adopts step-by-step polymerization: add 1000 parts of distilled water and 100 parts of polyvinylpyrrolidone into a four-port reaction vessel with condensed water, raise the temperature of the reaction kettle to 90 degrees, stir and dissolve until the material is transparent. Add styrene (St) monomer and 2 parts of ammonium persulfate initiator, react for 20 hours, turn white emulsion, add 40 parts of butyl acrylate (Ba) and continue to react for 2 hours. Th...

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Abstract

The present invention relates to compound electrode slices applied in lithium ion battery and producing method thereof, which belongs to fields of battery production, in order to provide a new septum and cathode two-in-one electrode slices. The provided compound electrode slices is polymer colloid latex initiated, grafted and copolymerized by 1-5 portion initiator in aqueous solution containing 100 portion water-solubility polymer by 30-500 portion hydrophobic monomer and 0-200 portion hydrophilic monomer. Counted as that the solid content in the polymer colloid latex is 100%, the inorganic filler of 0-100% and the plasticizer of 20-100% are added, and the slurry is coated on the carbon cathode slice which is obtained by drying. The electrode slices has good heat stability and electrochemistry stability, super water absorptivity and rapid water absorption speed, and keeps higher water absorptivity in whole circle service life period. The battery has credible safety and circle service life, and the present invention provides a new thinking for lithium ion battery fields.

Description

technical field [0001] The invention relates to a composite electrode sheet applied to a lithium ion battery and a preparation method thereof, belonging to the field of battery manufacturing. Background technique [0002] Lithium-ion battery is a new type of high-performance battery that has been developing rapidly in the past ten years. It has the characteristics of small size, light weight, and high energy density. It has been widely used in electronic appliances such as mobile communications, cameras, and notebook computers. In recent years To vigorously research and develop high-power, high-capacity lithium-ion batteries for electric tools, electric bicycles, electric vehicles, satellite positioning systems, national defense, aerospace and other fields. [0003] Lithium-ion batteries are composed of positive electrode, negative electrode, separator and electrolyte. The positive electrode is the provider of lithium source, and its positive electrode material is mainly LiC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 邓正华潘中来邓佳闽李仁贵陈勉忠熊俊威杜鸿昌王璐王凯秦华汪沣
Owner CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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