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Composite membrane for lithium ion battery and lithium ion battery using same

A lithium-ion battery and composite diaphragm technology, which is used in secondary batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as direct contact between positive and negative electrodes, battery deformation, and short circuit.

Inactive Publication Date: 2010-12-15
海悉新能源科技(上海)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer separator is light in weight and has good electronic insulation performance. The disadvantage is that the melting point of the polymer is generally low. When the battery is thermally abused, the heat accumulation inside the battery is easy to deform and the positive and negative electrodes are in direct contact with each other. short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Preparation of ceramic composite diaphragm: (1) disperse 1ml of 20% polydimethyldiallylammonium chloride in 0.5M NaCl solution in 40ml of mass percentage concentration; (2) disperse 0.05g of polystyrene sulfonic acid Sodium is dispersed in the NaCl solution of 40 milliliters 0.5M; (3) the commercially available porous zirconia membrane of 60% porosity is soaked in the solution that step (1) makes after 30 minutes, take out and dry; (4) Immerse the zirconia film treated in step (3) in the solution prepared in step (2), take it out and dry it after 30 minutes; (5) repeat the immersion process of step (3) and step (4) 3 times, that is A ceramic composite diaphragm is obtained.

[0085] Positive electrode preparation: add lithium cobalt oxide positive electrode material, acetylene black, and polyvinylidene fluoride into N-methylpyrrolidone solvent at a mass ratio of 85:7:8, mix evenly; coat on an aluminum foil with a thickness of 20 microns, and After drying at 60°C for 30...

Embodiment 2

[0089] Preparation of ceramic composite diaphragm: (1) disperse 3ml of 20% polydimethyldiallyl ammonium chloride in 50ml of 0.5M NaCl solution; (2) 0.15g of polystyrenesulfonic acid Sodium is dispersed in the NaCl solution of 50 milliliters 0.5M; (3) the commercially available porous zirconia membrane of 50% porosity is soaked in the solution that step (1) makes after 30 minutes, take out and dry; (4) Immerse the zirconia film treated in step (3) in the solution prepared in step (2), take it out and dry it after 30 minutes; (5) repeat the immersion process of step (3) and step (4) 3 times, that is A ceramic composite diaphragm is obtained.

[0090] Positive electrode preparation: add lithium cobalt oxide positive electrode material, acetylene black, and polyvinylidene fluoride into N-methylpyrrolidone solvent at a mass ratio of 85:7:8, mix evenly; coat on an aluminum foil with a thickness of 20 microns, and After drying at 60°C for 30 minutes, place it in a vacuum oven and dr...

Embodiment 3

[0094] Preparation of ceramic composite diaphragm: (1) disperse 1ml of 20% polydimethyldiallyl ammonium chloride in 10ml of 0.5M NaCl solution; (2) 0.05g of polystyrenesulfonic acid Sodium was dispersed in 10 milliliters of 0.5M NaCl solution; (3) after soaking the commercially available PP film in a 1% sodium dodecylsulfonate solution by mass ratio for 30 minutes, take out the hot air and dry it; (4 ) immersing the diaphragm obtained after the treatment in step (3) in the solution prepared in step (2) for 30 minutes, then taking it out and drying it in the air; (5) immersing the zirconia film treated in step (3) in the step ( 1) In the prepared solution, after soaking for 30 minutes, take it out and dry it in the air; (6) repeat the impregnation process of step (4) and step (5) 3 times; The powder is dispersed in the solution prepared in step (1), and left to stand for 30 minutes, then centrifuged and washed with distilled water for 3 times with the isolated zirconia nanopowd...

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Abstract

The invention discloses a composite membrane for a lithium ion battery and the lithium ion battery using the same. The composite membrane comprises a membrane matrix and a polyelectrolyte composite layer, wherein the membrane is a ceramic composite membrane consisting of yttrium oxide-stabilized zirconium oxide and polyelectrolyte; in the yttrium oxide-stabilized zirconium oxide, the yttrium oxide accounts for 8 to 13 weight percent and the zirconium oxide accounts for 87 to 92 weight percent; and the polyelectrolyte of the ceramic composite membrane accounts for 0.1 to 2.0 percent of the total weight of the membrane. The lithium ion battery using the composite membrane comprises an electrode assembly and nonaqueous electrolyte which are sealed in a battery shell, and the composite membrane is the ceramic composite membrane. By compounding ceramic and the polyelectrolyte, the composite membrane can effectively improve the wetting property of organic electrolyte to the ceramic membrane, the solution holding capacity of ceramic pores, and the work safety of the battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries and relates to high-safety lithium-ion batteries. Specifically, it relates to a ceramic composite diaphragm with high melting point and high temperature stability and a high-capacity lithium ion battery using the ceramic composite diaphragm as a battery diaphragm. technical background [0002] In recent years, with the depletion of earth resources and the enhancement of social environmental awareness, green and clean energy has become an important direction in the field of energy storage and energy conversion. As a basic energy storage and conversion device, chemical power sources have become an indispensable part of production and life. Today, with the rapid development of portable electronic devices, the demand for rechargeable chemical power sources is extremely urgent. Compared with traditional secondary batteries such as nickel-cadmium and lead-acid, lithium-ion batteries have t...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622H01M2/14H01M10/0525H01M10/058H01M50/403H01M50/414H01M50/434H01M50/489
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 孙俊才文钟晟李嵩季世军
Owner 海悉新能源科技(上海)股份有限公司
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