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battery separator

A separator and battery technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of low internal resistance, thin film of the separator, and the durability of the electrolyte, so as to reduce the internal resistance , excellent durability

Active Publication Date: 2018-09-14
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not easy for conventional aluminum oxides to satisfy all the problems of durability to the electrolyte, low internal resistance, and thinning of the separator.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0065] The following materials were stirred with a homogenizer (manufactured by PRIMIX, trade name: T.K. HOMODISPER Model 2.5, rotation speed 1500 rpm) for 3 hours to prepare dispersion (1).

[0066]

[0067] To 100 parts by mass of the dispersion liquid (1), 100 parts by mass of a 0.6% by mass sodium carboxymethyl cellulose aqueous solution (manufactured by Nippon Paper Industries, trade name: MAC500LC) and 6 parts by mass of acrylic acid were added Latex-like latex (manufactured by JSR, trade name: TRD202A, concentration 40.2% by mass), and coating liquid (1) was prepared.

[0068] 30 parts by mass of regular polyethylene terephthalate (PET) fiber (0.1dtex, length 5mm), 40 parts by mass of stretched regular PET fiber (0.3dtex, length 5mm), 30 The composition of unstretched PET fiber (0.2dtex, length 4mm) in parts by mass, the unit area weight is 9.5g / m by the wet method 2 Fiber web. The drying temperature at this time was 130°C. Next, heat calendering was applied at 190°C to pr...

Embodiment 1-2

[0070] Using compound 3 instead of compound 2 in Example 1-1, the coating amount was 11g / m 2 The thickness of the separator is 24μm.

Embodiment 1-3

[0072] Using compound 4 instead of compound 2 in Example 1-1, the coating amount was 12g / m 2 The thickness of the separator is 24μm.

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PUM

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Abstract

The battery separator of the present invention has a porous support body and a porous membrane layer containing inorganic particles. )y(1.0

Description

Technical field [0001] The present invention relates to a separator for batteries. Background technique [0002] Conventionally, as a separator for a battery used in a lithium secondary battery (hereinafter may be simply referred to as a "separator"), a porous film of polyolefin having penetrating fine pores has been used. The separator assumes the following structure: when the battery generates heat due to an abnormality, the penetrating fine pores will melt and be blocked, thereby increasing the internal resistance of the battery, thereby suppressing heat generation, and suppressing the thermal runaway of lithium cobalt oxide as an electrode material The explosion of the battery. [0003] However, in applications requiring high-current charging and discharging, such as batteries for hybrid electric vehicles and uninterruptible power sources, according to recent research, techniques for suppressing thermal runaway explosions caused by electrode materials have also been developed....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/434
CPCH01M10/052Y02E60/10H01M50/434
Inventor 高冈和千代中岛敏充
Owner MITSUBISHI PAPER MILLS LTD