Polymer cell and preparation method thereof

A polymer and battery technology, used in battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve problems such as low battery energy density, achieve excellent cycle performance, prevent adverse consequences, and increase capacity.

Inactive Publication Date: 2013-06-12
SHENZHEN OCEANSUN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of low energy density of polymer lithium-ion batteries in the prior art, the in...

Method used

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Examples

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preparation example Construction

[0017] The preparation method of the polymer battery disclosed in the present invention comprises:

[0018] a. Obtain a positive electrode sheet and a negative electrode sheet, wherein in the negative electrode sheet, the negative electrode active material is silicon carbide;

[0019] b, forming a polymer porous film on both sides of the separator and the negative electrode material of the negative electrode sheet;

[0020] c. Laminating or winding the negative electrode sheet, separator, and positive electrode sheet sequentially to make a bare cell, in which the polymer porous film on the surface of the negative electrode sheet is in contact with the polymer porous film on the surface of the separator;

[0021] d. Accommodating the bare cell in the battery casing, injecting electrolyte solution and packaging to obtain the battery precursor;

[0022] e. Plasticizing and forming the battery precursor to obtain the polymer battery.

[0023] In the above method, the preparation...

Embodiment 1

[0064] This example is used to illustrate the preparation method of the polymer battery and the polymer battery disclosed in the present invention.

[0065] LiCoO 2 As the positive electrode active material, carbon black (Super P) is used as the conductive agent, polyvinylidene fluoride (PVDF) is used as the binder, and aluminum foil is used as the positive electrode current collector. The positive electrode sheet is prepared as follows:

[0066] 2.6 parts by weight of binder are dissolved in 45 parts by weight of N-methylpyrrolidone solvent to prepare binder solution, then 95.6 parts by weight of positive active material and 1.8 parts by weight of conductive agent that have been mixed uniformly are added to the above binder solution, stir and mix evenly to obtain positive electrode slurry; use a pulper to evenly coat the positive electrode slurry on the aluminum foil. After being heated and dried at 125° C., the positive electrode sheet was obtained by roll forming the cut s...

Embodiment 2

[0075] This example is used to illustrate the preparation method of the polymer battery and the polymer battery disclosed in the present invention.

[0076] The preparation method of the positive electrode sheet and the negative electrode sheet is the same as in Example 1, wherein the difference is that the content of the negative electrode active material is 80 parts by weight, the content of the conductive agent is 10 parts by weight, the content of the binder is 8 parts by weight, and the dispersant The content is 2 parts by weight.

[0077] The polymer battery S2 was prepared according to the method of Example 1.

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Abstract

The invention provides a preparation method of a polymer cell. The preparation method comprises the following steps of 1, preparing an anode piece and a cathode piece, wherein a cathode active substance in the cathode piece is silicon carbide, 2, coating polymer porous membranes on two sides of a diaphragm and on a cathode material of the cathode piece, 3, orderly laminating or winding the cathode piece, the diaphragm and the anode piece to obtain a nude electrical core, wherein in the nude electrical core, the polymer porous membrane on the surface of the cathode piece contacts with the polymer porous membrane on the surface of the diaphragm, 4, putting the nude electrical core into a cell case, pouring an electrolyte into the cell case, and carrying out packaging to obtain a cell precursor, and 5, carrying out plasticization and formation of the cell precursor to obtain the polymer cell. The invention also discloses the polymer cell obtained by the preparation method. The polymer cell obtained by the preparation method has high energy density and a large capacity.

Description

technical field [0001] The invention relates to a preparation method of a polymer battery and a polymer battery prepared by the method. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, small size, no memory effect and long life. High energy battery. [0003] At present, lithium-ion batteries still use a liquid electrolyte system. Although lithium-ion batteries using a liquid electrolyte system have good high-rate charge-discharge performance and low-temperature performance, there are safety hazards such as leakage. [0004] Polymer lithium ion battery is a new generation of high specific energy secondary battery system developed on the basis of liquid lithium ion battery. Compared with traditional liquid lithium-ion batteries, it has the following obvious advantages: 1. The use of polymer electrolytes instead of liquid electrolyte solutions can effectively avoid possible electrolyte leakage problems in li...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/583H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 赖桂棠许晶王涛李科严磊陈兴荣
Owner SHENZHEN OCEANSUN BATTERY
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