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Integrated polymer lithium ion battery and method for preparing same

A lithium ion battery and polymer technology, applied in the field of polymer lithium ion battery and its preparation, can solve the problems of large difference in electrochemical performance, high battery manufacturing cost and difficulty, and achieve simple process flow, easy operation, low cost effect

Active Publication Date: 2009-12-23
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is very difficult for mass production, and the plasticizer is difficult to remove. The residual plasticizer will cause the battery to swell, the battery cycle performance will deteriorate, the electrochemical performance will vary greatly, and the battery manufacturing cost will be high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the above-mentioned integrated polymer lithium ion battery is:

[0022] ①Preparation of batteries

[0023] The positive and negative tabs of the lithium-ion battery are spot welded, separated by a separator, and then wound into a battery cell.

[0024] ②Configure the polymer electrolyte:

[0025] Dissolve an appropriate amount of polymer in the electrolyte to form a viscous solution, and then use anhydrous tetrahydrofuran THF or acetone as a diluent to make the viscosity of the polymer electrolyte reach the required concentration value. The electrolyte used in the present invention is composed of carbonate ethylene carbonate (EC) and / or diethyl carbonate (DEC) and / or dimethyl carbonate (DMC) and / or methyl ethyl carbonate (EMC) and / or Or propylene carbonate (PC) and organic solvent tetrahydrofuran or acetone and other low-boiling volatile components and corresponding lithium hexafluorophosphate.

[0026] ③Wrap the battery

[0027] First, dry...

Embodiment example 1

[0031] ①Preparation of batteries:

[0032] The positive and negative tabs of the lithium-ion battery are spot-welded, separated by a diaphragm, and then wound into a cell for later use.

[0033] ②Configure the polymer electrolyte:

[0034] Dissolve 0.5 g of vinylidene fluoride-hexafluoropropylene copolymer in 24.5 g of electrolyte of ethylene carbonate EC and diethyl carbonate DEC containing 1 molar concentration of lithium hexafluorophosphate (EC:DEC=1:1) to form a viscous solution. Then use anhydrous THF or acetone as a diluent to make the viscosity of the polymer electrolyte reach the required level.

[0035] ③Wrap the cell:

[0036] Then, immerse the spare core into the electrolyte, expose the tab position, soak for about 4-7 minutes, take it out, and place it in a vacuum-heated rotary box for centrifugation and concentration for 1-3 minutes, so that the diluent in the electrolyte is slowly evaporated, The electrolyte penetrates into the pole piece, and the polymer even...

Embodiment example 2

[0040] ①Preparation of batteries:

[0041] The positive and negative tabs of the lithium-ion battery are spot-welded, separated by a diaphragm, and then wound into a cell for later use.

[0042] ②Configure the polymer electrolyte:

[0043] Dissolve 0.25 g of vinylidene fluoride-hexafluoropropylene copolymer and 0.25 g of polyethylene oxide (molecular weight of 500,000) in 24.5 g of electrolyte of ethylene carbonate EC and diethyl carbonate DEC containing 1 molar concentration of lithium hexafluorophosphate , where ECDEC=1:1, to form a viscous solution, and then use anhydrous THF or acetone as a diluent to make the viscosity of the polymer electrolyte reach the required level.

[0044] ③Wrap the cell:

[0045] Then, immerse the spare core into the electrolyte, expose the pole ears, soak for about 5 minutes, take it out, and place it in a vacuum heated rotary box for centrifugation and concentration for 1 minute, so that the diluent in the electrolyte slowly evaporates and the...

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PUM

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Abstract

The invention provides an integrated polymer lithium ion battery and a method for preparing the same. The battery comprises an electric core wound by an anode plate, a cathode plate and a diaphragm arranged between the anode plate and the cathode plate and separating the anode plate and the cathode plate and electrolyte solution, and is characterized in that the electric core and the electrolyte solution are coated and bonded into an integrated structure by a layer of diaphragm made of polymers. The integrated structure can effectively solve the problems that the battery leaks and is unsafe due to the flowing of the electrolyte solution, and cannot be directly used as the internal battery due to poor hardness. The method has the advantages of simple preparation process step, easy and convenient operation, low cost and the suitability for mass production.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, more particularly to a polymer lithium ion battery and a preparation method thereof. Background technique [0002] In 1996, the polymer lithium-ion battery was successfully developed in the laboratory. In view of all the advantages of traditional lithium-ion batteries, and better advantages in terms of weight, shape and safety of batteries, they have been widely used and are known as the chemical energy of the 21st century. Polymer lithium ions are usually composed of battery cells and packaging polymer films, which replace traditional metal steel shells. [0003] However, the current polymer lithium-ion battery has the problem of leakage and unsafety caused by the flow of electrolyte, and the hardness cannot be directly used as a built-in battery. In order to solve these problems, the electrolyte, separator, positive and negative electrode materials inside the polymer l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/38
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 郭也平陈国荣
Owner EVE ENERGY CO LTD
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