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Method of preparing gel polymer lithium ion battery

A technology of lithium-ion batteries and gel polymers, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of complex plasticizer extraction process, complex process, difficult to control, etc., and achieve a firm and stable internal structure of the battery cell , The process is simple, and the effect of reducing surface unevenness

Active Publication Date: 2013-04-03
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this technology is that the process is too complicated, the cost is high, and the extraction process of plasticizer is complicated and difficult to control

Method used

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  • Method of preparing gel polymer lithium ion battery
  • Method of preparing gel polymer lithium ion battery
  • Method of preparing gel polymer lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare a kind of gel polymer lithium-ion battery, its preparation process is as follows figure 1 As shown, each material and component are as follows.

[0038] Cathode, LiCoO 2 : Acetylene carbon black conductive agent: PVDF binder (mass ratio) = 96: 1.6: 2.4; positive current collector is aluminum foil.

[0039] Negative electrode, artificial graphite: SBR binder: sodium carboxymethyl cellulose (mass ratio) = 96:2.5:1.5; negative electrode current collector is copper foil.

[0040] Separator, 42.5% porosity polyolefin separator, thickness 12 μm.

[0041] Liquid electrolyte, EC: DEC: PC (mass ratio) = 1: 1: 0.2, LiFP 6 = 1M.

[0042] P(VDF-HFP) mixed solution, P(VDF-HFP): acetone: n-butanol: acetate ethanol (mass ratio) = 1:12:3:1; among them, monomeric HFP in P(VDF-HFP) The mass ratio to VDF is 13:100.

[0043] Prepare liquid electrolyte and P(VDF-HFP) mixed solution according to the above ratio.

[0044] The prepared P(VDF-HFP) mixed solution is coated on the ...

Embodiment 2

[0060] A gel polymer lithium ion battery was prepared. The difference between the materials and components of Example 1 was that in the prepared P(VDF-HFP) mixed solution, the solvent was a combination of acetone and tetrahydrofuran, and the non-solvent was positive Butanol, the proportion is, P(VDF-HFP): acetone: tetrahydrofuran: n-butanol (mass ratio) = 1:6:6:4.

[0061] Its preparation process differs from Example 1 in that the prepared solution P(VDF-HFP) mixed solution is coated on the positive electrode sheet of the battery, thereby forming a composite porous membrane on the positive electrode sheet of the battery instead of forming a porous film on the separator. composite porous membrane.

[0062] A set of batteries was produced according to the above method, and the battery safety performance test was carried out by using the method in Example 1, and the battery test results were qualified.

Embodiment 3

[0064] Prepare a kind of gel polymer lithium ion battery, each material and component are different from embodiment 1 in that, in the prepared P(VDF-HFP) mixed solution, solvent adopts dimethylformamide, non-solvent adopts acetic acid Ethanol, the ratio is, P(VDF-HFP): dimethylformamide: ethyl acetate (mass ratio) = 5:100:30.

[0065] Its preparation process is identical with embodiment 1.

[0066] A set of batteries was produced according to the above method, and the battery safety performance test was carried out by using the method in Example 1, and the battery test results were qualified.

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Abstract

The invention discloses a method of preparing a gel polymer lithium ion battery, comprising the following steps: solving P(VDF-HFP) in organic solvent, and then adding P(VDF-HFP) nonsolvent to obtain mixed P(VDF-HFP) solution; spreading the mixed P(VDF-HFP) solution on the diaphragm or the positive electrode plate and the negative electrode plate of the lithium ion battery to volatilize the solvent of the mixed P(VDF-HFP) solution and form a composite porous film on the diaphragm or the positive electrode plate and the negative electrode plate of the lithium ion battery; assembling the positive electrode plate and the negative electrode plate with the diaphragm of the lithium ion battery, and injecting liquid electrolyte in to as assembled electrical core; and heating and baking the electrical core to make the composite porous film and the liquid electrolyte form gel to obtain the gel polymer lithium ion battery. The method of preparing the gel polymer lithium ion battery has simple process, low cost and wide application range and ensures that the produced composite porous film has high liquid absorption rate and stable structure and the gel polymer lithium ion battery has good cycling performance and conducting performance.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a preparation method of a gel polymer lithium ion battery. Background technique [0002] Traditional lithium-ion batteries use liquid electrolytes, which consist of lithium salts dissolved in organic solvents such as carbonates. For the liquid electrolyte, the applicable negative electrode materials are limited; the liquid electrolyte is easy to decompose to generate gas and form excessive vapor pressure during the discharge process. In addition, the liquid electrolyte is easy to corrode the shell of the battery cell, causing leakage and the like. The polymer lithium-ion battery is a new type of green and environmentally friendly chemical energy that appeared in the 1990s. It has the advantages of high voltage, large specific energy, stable discharge voltage, good cycle performance, good safety performance and long storage life. [0003] Bell Communication Research Institu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/40
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陈向魁桑成涛韦壮平潘丽群
Owner ZHENGZHOU BAK BATTERY CO LTD
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