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Polymer lithium ion battery and preparation method of diaphragm thereof

A technology of lithium-ion batteries and polymers, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of complex plasticizer extraction process, decreased battery yield, and easy micro-short circuit, etc. Ion conduction, cost reduction, effect of increasing irregularity

Active Publication Date: 2014-04-30
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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  • Polymer lithium ion battery and preparation method of diaphragm thereof
  • Polymer lithium ion battery and preparation method of diaphragm thereof
  • Polymer lithium ion battery and preparation method of diaphragm thereof

Examples

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Embodiment Construction

[0053] 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:

[0054] Positive electrode, LiCoO2: acetylene carbon black conductive agent: PVDF binder (mass ratio) = 96: 1.6: 2.4; positive electrode current collector is aluminum foil.

[0055] 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.

[0056] Separator, 39.5% porosity polyolefin separator, thickness 12 μm.

[0057] Liquid electrolyte, EC: DEC: PC (mass ratio) = 1: 1: 0.2, LiFP 6 = 1M.

[0058] P(VDF-HFP) solution: P(VDF-HFP):acetone=1:10.

[0059] TBT precursor solution (taking the amount of P(VDF-HFP) as 1), TBT:AcAc:n-butanol (mass ratio)=0.34:0.1:4.

[0060] Catalyst preparation (TBT amount is 1), HCl: H 2 O: acetone (mass ratio) = 0.1:2:10.

[0061] Prepare liquid electrolyte, P(VDF-H...

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Abstract

The invention discloses a polymer lithium ion battery and a preparation method of a diaphragm of the polymer lithium ion battery. The preparation method comprises the following steps: dissolving P(VDF-HFP) into an organic solvent, and adding inorganic ultra-fine powder into the mixture by adopting an in-situ hydrolysis method so as to prepare a mixed solution of P(VDF-HFP)-TiO2; coating the mixed solution on a polyolefin diaphragm so that the solvent is volatilized and a composite porous membrane is formed on the diaphragm; then assembling positive and negative pole pieces with the diaphragm; injecting liquid electrolyte into an electric core after assembling; and heating and baking the electric core so that the composite porous membrane and the electrolyte form a gel so as to prepare a gel polymer battery. The method has a simple technological process for preparing the polymer battery, low cost and wide application range of a production process; and the manufactured composite porous membrane has the advantages of high liquid absorption rate, high porosity and stable structure, and the battery has good cycling performance and electric conductivity.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a preparation method of a polymer lithium ion battery and a diaphragm. 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 Rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/40H01M2/14H01M50/403
CPCY02E60/10Y02P70/50
Inventor 陈向魁黄东
Owner ZHENGZHOU BAK BATTERY CO LTD
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