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Separator for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte storage batteries, lithium storage batteries, battery pack components, etc., can solve problems such as temperature rise, fire, separator melting, etc., achieve excellent load characteristics, charge and discharge cycle Excellent effect

Inactive Publication Date: 2013-06-05
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature of the battery rises further after shutdown, the melted polyethylene tends to flow, and the so-called melting of the separator may occur.
In this case, the positive and negative electrodes are in direct contact, and the temperature rises further, and in the worst case, there is a danger of fire

Method used

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  • Separator for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery
  • Separator for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery
  • Separator for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107]

[0108] Urethane acrylate as an oligomer ("EBECRYL8405" manufactured by Daicel-Cytec Corporation): 80 parts by mass, tripropylene glycol diacrylate as a monomer: 20 parts by mass, di(2 , 4,6-trimethylbenzoyl)-phenylphosphine oxide: 2 parts by mass, boehmite (average particle diameter: 1 μm) as inorganic particles (B): 300 parts by mass, and as solvent (a) The mixed solvent of ethyl acetate and dodecane as solvent (b) with a volume ratio of 9:1: in 600 parts by mass, add 5 times the amount (mass basis) of boehmite The zirconia beads were uniformly stirred for 15 hours using a ball mill, and then filtered to prepare a separator-forming slurry.

[0109]

[0110] Using N-methyl-2-pyrrolidone (NMP) as a solvent, graphite as the negative electrode active material: 95 parts by mass and PVDF: 5 parts by mass were uniformly mixed to prepare a paste containing the negative electrode mixture. The paste is applied intermittently on both sides of a 10 μm thick current collect...

Embodiment 2

[0124] Except for changing the monomer to 1,6-hexanediol diacrylate, it was carried out in the same manner as in Example 1 to prepare a separator-forming slurry, and it was the same as in Example 1 except that this slurry for separator formation was used. Operate in an efficient manner to make an integrated product of the separator and the negative electrode. The volume V of the resin (A) in the separator A and the volume V of the inorganic particle (B) B ratio of V A / V B is 0.82.

[0125] Then, a nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the above-mentioned integrated product of the separator and the negative electrode was used.

Embodiment 3

[0127] Except that the oligomer was changed to urethane acrylate ("EBECRYL8402" manufactured by Daicel-Cytec Co., Ltd.), and the monomer was changed to tetraethylene glycol diacrylate, the separator was prepared in the same manner as in Example 1. Using the slurry, except that the slurry for forming a separator was used, it was carried out in the same manner as in Example 1, and an integrated product of the separator and the negative electrode was produced. The volume V of the resin (A) in the separator A and the volume V of the inorganic particle (B) B ratio of V A / V B is 0.82.

[0128] Then, a nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the above-mentioned integrated product of the separator and the negative electrode was used.

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Abstract

A non-aqueous electrolyte secondary battery having excellent load characteristics and excellent charge / discharge cycle characteristics, a separator that can constitute the non-aqueous electrolyte secondary battery, and a method for producing the separator are provided. The separator for non-aqueous electrolyte secondary batteries according to the present invention includes at least a resin (A) having a crosslinked structure. The resin having the crosslinked structure is obtained by applying energy rays to at least an oligomer that is capable of being polymerized by irradiation with energy rays, and the resin (A) has a glass transition temperature higher than 0 DEG C. and lower than 80 DEG C. The separator for non-aqueous electrolyte secondary batteries according to the present invention can be produced using a method of the present invention including the steps of applying a separator-forming composition containing an oligomer and a solvent to a base substrate, forming a resin (A) by irradiation with energy rays, and forming pores by drying a coating film after the resin (A) has been formed. Furthermore, the non-aqueous electrolyte secondary battery of the present invention includes the separator for non-aqueous electrolyte secondary batteries according to the present invention.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery excellent in load characteristics and charge-discharge cycle characteristics, a separator capable of constituting the nonaqueous electrolyte secondary battery, and a manufacturing method thereof. Background technique [0002] Non-aqueous electrolyte secondary batteries such as lithium secondary batteries are widely used as power sources for portable devices such as mobile phones and notebook personal computers due to their high energy density. With the improvement of the performance of portable devices, various battery characteristics, Security has become an important issue. [0003] In current lithium secondary batteries, a polyolefin-based porous film having a thickness of, for example, about 20 to 30 μm is used as a separator interposed between the positive electrode and the negative electrode. However, in the production of such a polyolefin-based porous film, in order to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/414H01M50/449H01M50/489
CPCY02E60/12H01M2/166H01M2/1666H01M2/348H01M2/1626H01M10/05C08F2/46H01M2/145H01M10/052H01M2/1653H01M2/16Y02E60/10H01M50/4295H01M50/44H01M50/446H01M50/403H01M50/489H01M50/414H01M50/491H01M50/42H01M50/431H01M2220/30Y02P70/50
Inventor 古谷隆博儿岛映理渡边利幸小山邦彦
Owner HITACHI LTD