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Diaphragm for lithium ion battery and lithium ion battery applying diaphragm

A lithium-ion battery and diaphragm technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems affecting the safety of lithium-ion batteries, safety accidents, and short-circuiting of opposite electrodes, and solve battery short-circuit problems , avoid safety accidents and prolong service life

Active Publication Date: 2012-12-19
山东泰一新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing battery separators are made of polyolefin materials (such as polypropylene PP, polyethylene PE materials), and the melting temperature of polyolefin materials is around 130~160°C, which leads to the failure of the battery when the temperature is higher than the above-mentioned temperature. , the counter electrode inside the battery will be short-circuited, and the battery will generate severe heat, which will lead to safety accidents and affect the safety of lithium-ion batteries.

Method used

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  • Diaphragm for lithium ion battery and lithium ion battery applying diaphragm

Examples

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Embodiment 1

[0032] The specific preparation process of a ceramic fiber separator for a lithium-ion battery provided by the present invention is illustrated below through a specific example.

[0033] 1. Select the material step. Ceramic fiber can specifically choose solid alumina Al 2 o 3 Ceramic fiber (It should be noted that the solid alumina Al 2 o 3 Ceramic fibers can include Al in the alpha form 2 o 3 Ceramic fiber and γ-type Al 2 o 3 ceramic fiber), the solid alumina Al 2 o 3 The length of the ceramic fiber is selected as 120mm, and the solid alumina Al 2 o 3 The diameter of the ceramic fiber is selected as 2.5 μm;

[0034] The inorganic filler can specifically choose sodium carboxymethyl cellulose particles, and the inorganic glue and organic glue can be chosen to be a mixture of silane glue and polyacrylic acid glue.

[0035] In this embodiment, the mass ratio between the ceramic fiber, the inorganic filler and the two kinds of glue, the inorganic glue and the organic g...

Embodiment 2

[0050] The specific preparation process of a ceramic fiber separator for a lithium-ion battery provided by the present invention is illustrated again through a specific example.

[0051] 1. Material selection steps. Ceramic fiber can choose solid silicon oxide SiO 2 and solid alumina Al 2 o 3 (alpha-type Al 2 o 3 ) ceramic fiber, the mass ratio of silicon oxide and aluminum oxide is 80:20. Solid alumina Al 2 o 3 The length of the ceramic fiber is selected as 120mm, and the solid alumina Al 2 o 3 The diameter of the ceramic fiber is chosen to be 2.5 μm. The solid silicon oxide SiO 2 The length is chosen to be 150mm, the solid silicon oxide SiO 2 The diameter is chosen to be 2.0 μm.

[0052] The inorganic filler can specifically choose sodium carboxymethyl cellulose particles, and the inorganic glue and organic glue can be chosen to be a mixture of silane glue and polyacrylic acid glue.

[0053] In this embodiment, the mass ratio between the ceramic fiber, the inorg...

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Abstract

The invention discloses a diaphragm for a lithium ion battery and the lithium ion battery applying the diaphragm. The diaphragm is a ceramic fiber diaphragm and comprises ceramic fiber, inorganic fillers and inorganic adhesive and / or organic adhesive. The diaphragm for the lithium ion battery has the advantages that the performance is stable and reliable, the short-circuited problem of the battery due to melting of the diaphragm of an electrode can be solved, the safety accidents can be avoided, the safety performance is good, the long-time normal use of the lithium ion battery is guaranteed, and the service life of the lithium ion battery is prolonged, so that the diaphragm is wide in market application prospect and great in production and practice significance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a diaphragm for lithium ion batteries and a lithium ion battery used therefor. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, long cycle life, and no environmental pollution. As a secondary chemical power source that can convert electrical energy and chemical energy into each other, it is regarded as one of the popular candidate technologies for electric energy storage systems. . Since its birth, its application fields have been continuously expanded and developed rapidly. At present, it is not only widely used in mobile communication equipment and portable electronic equipment, but also widely used in large electric equipment such as electric tools, electric bicycles and electric vehicles. Therefore, the safety performance requirements of lithium-ion batteries are becoming more and more serious. High,...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 于申军田启友
Owner 山东泰一新能源股份有限公司
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