Method for preparing gel polymer lithium ion battery

A lithium-ion battery, gel polymer technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of complex plasticizer extraction process, decreased battery yield, easy to produce micro-short circuit, etc. Ionic conduction, cost reduction, effect of increasing randomness

Active Publication Date: 2014-08-27
ZHENGZHOU BAK BATTERY CO LTD
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  • 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, the extraction process of the plasticizer is complicated and difficult to control, and the thermal compounding process is prone to micro-short circuit, resulting in a decrease in battery yield

Method used

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

Examples

Experimental program
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Embodiment Construction

[0046] Prepare a kind of gel polymer lithium-ion battery, its preparation process is as follows figure 1 As shown, the materials and components are as follows:

[0047] Cathode, LiCoO 2 : Acetylene carbon black conductive agent: PVDF binder (mass ratio) = 96: 1.6: 2.4; positive current collector is aluminum foil.

[0048] Negative electrode, 96% artificial graphite: SBR binder: sodium carboxymethyl cellulose (mass ratio) = 96:2.5:1.5; the negative electrode current collector is copper foil.

[0049] Separator, 39.5% porosity polyolefin separator, thickness 12 μm.

[0050] Liquid electrolyte, EC: DEC: PC (mass ratio) = 1: 1: 0.2, LiFP 6 = 1M.

[0051] P(VDF-HFP) solution, P(VDF-HFP):acetone (mass ratio)=1:13.

[0052] TBT precursor solution (taking the amount of P(VDF-HFP) as 1), TBT:AcAc:n-butanol (mass ratio)=0.34:0.1:4.

[0053] Catalyst (TBT amount is 1), HCl: H 2 O: acetone (mass ratio) = 0.1:2:10.

[0054] Prepare liquid electrolyte, P(VDF-HFP) solution, TBT precu...

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Abstract

The invention discloses a preparation method of a gel polymer lithium ion battery. P(VDF-HFP) is dissolved in an organic solvent, and an in-situ hydrolysis method is used to add inorganic ultrafine powder to prepare the P(VDF-HFP )-TiO2 mixed solution, and then apply the mixed solution to the positive and negative plates of the battery, volatilize the solvent, and form a composite porous film on the positive and negative plates, and then assemble the pole plate and the diaphragm containing the composite porous film, and assemble The liquid electrolyte is injected into the final cell, and the cell is heated and baked, so that the composite porous membrane and the electrolyte form a gel to form a gel polymer battery. The process of manufacturing the polymer battery by the method is simple, the cost is reduced, and the production process is widely applicable; the manufactured composite porous membrane has high liquid absorption rate, high porosity, stable structure, and good battery cycle performance and electrical conductivity.

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
CPCY02E60/10Y02P70/50
Inventor 陈向魁黄东
Owner ZHENGZHOU BAK BATTERY CO LTD
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