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Composite laminated chemically crosslinked separator

A technology of layered structure and cross-linked structure, applied in electrochemical generators, hybrid capacitor separators, chemical instruments and methods, etc., can solve the limitations of performance improvement, unsatisfactory permeability, and thermal stability. It has the effect of high safety and improved heat resistance due to problems such as insufficient compatibility or liquid retention.

Pending Publication Date: 2022-03-11
ASAHI KASEI KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, as long as polyolefin is used as the resin, even if the mechanical microporous structure of the separator is improved, there is a limit to performance improvement.
For example, due to the heat-resistant stability of the separator at the melting point of polyolefin or the electronegativity of the olefin unit, the affinity with the electrolyte or the liquid retention are not sufficient, so that Li ions or their solvation The permeability in the separator of ion clusters is not satisfactory

Method used

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  • Composite laminated chemically crosslinked separator
  • Composite laminated chemically crosslinked separator
  • Composite laminated chemically crosslinked separator

Examples

Experimental program
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Effect test

no. 2 approach

[0605] In the second embodiment, the method for manufacturing an electrical storage device of the present disclosure may include, for example, the following steps:

[0606] (i) a preparation process of preparing an outer case for accommodating a laminate or a wound body of an electrode and a separator for an electrical storage device of the present disclosure, and a non-aqueous electrolytic solution;

[0607] (ii) liquid injection process, non-aqueous electrolytic solution is injected in the casing;

[0608] (iii) a terminal connection process, as desired, to connect the lead terminal to an electrode inside the housing or an electrode exposed from the housing; and

[0609] (iv) In the charging and discharging step, at least one cycle of charging and discharging is performed as desired.

[0610] Steps (i) to (iv) can be performed according to methods known in the technical field except for using the separator for an electrical storage device of the present disclosure. In step...

Embodiment 1

[0805]

[0806] According to the following steps, two kinds of polyolefin microporous membranes with two-layer laminated structure were produced.

[0807] In order to form a microporous layer (CL) capable of forming a cross-linked structure, a polyolefin with a viscosity average molecular weight of 120,000 is added as a raw material to 79.2% by mass of polyethylene (UHMWPE(A)) which is a homopolymer with a weight average molecular weight of 1,100,000 19.8% by mass of silane-grafted polyethylene (PE(B)) of 0.33 g / min obtained through the modification reaction of vinyl silane substituted by trimethoxy alkoxide (according to the above, (A) and (B) ) are 0.8 and 0.2), respectively, 1% by mass of pentaerythritol-tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] as an antioxidant, using a drum mixer Dry blending, thus obtaining a mixture.

[0808] In order to form a polyethylene microporous layer (PE), 0.3 parts by mass of tetrakis-(methylene-3-(3' ,5'-di-tert-butyl-4'-...

Embodiment 2～3

[0817] As shown in Table 8, the polyethylene (PE) conditions for forming the polyethylene microporous layer (PE), the composite layer constitution conditions, the arrangement conditions in the battery, etc. were changed, and the same as in Example 1 were performed except that According to the operation, polyolefin microporous membranes, separators and batteries having two kinds of two-layer laminated structures shown in Table 8 were obtained. The obtained separator and battery were subjected to various evaluations according to the above-mentioned evaluation methods, and the evaluation results are also shown in Table 8.

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Abstract

The purpose of the present disclosure is to provide a polyolefin microporous membrane having higher safety, and a separator for a power storage device, a power storage device assembly kit, a power storage device, and a power storage device using the same. In one embodiment, the polyolefin microporous membrane is provided with at least one layer A and at least one layer B, and the polyolefin contained in at least one of the layer A and the layer B has one or more functional groups. (1) the functional groups are subjected to a condensation reaction with each other, (2) the functional groups are reacted with chemical substances inside the electricity storage device, or (3) the functional groups are reacted with other types of functional groups, thereby forming a cross-linked structure. In another embodiment, the polyolefin contained in at least one of the A layer and the B layer has one or more functional groups, and the functional groups include functional groups in which the functional groups are subjected to a condensation reaction with each other in the electricity storage device to form a crosslinked structure based on a siloxane bond.

Description

technical field [0001] The present disclosure relates to a polyolefin microporous film, a separator for an electrical storage device using the same, an electrical storage device, and the like. Background technique [0002] Microporous membranes are widely used as separation or selective permeation separation membranes and separators for various substances. Examples of their applications include microfiltration membranes, fuel cell applications, separators for capacitors, and pore filling functions. Base materials for functional films that express new functions, separators for electrical storage devices, etc. Among them, polyolefin microporous films are suitable for use as separators for lithium ion batteries widely used in notebook personal computers, mobile phones, digital cameras, and the like. [0003] In order to ensure the safety of the battery, technologies have been proposed to realize the on-off function and increase the membrane rupture temperature by forming a cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/417H01M10/0525H01M50/403H01M50/431H01M50/457H01M50/491
CPCH01M50/403H01M50/417H01M50/457H01M50/491H01M50/431H01M10/0525H01G11/06H01G11/18H01G11/52H01G11/30H01M4/525H01M4/505H01M50/449H01M50/451B32B2255/26B32B7/10B32B2457/10B32B2255/10B32B2250/242B32B2250/02B32B27/32B32B27/08H01M50/434H01M50/443H01M4/5825H01M50/42H01M50/426H01M50/423H01M10/052H01M10/0585H01M10/0587C08J9/28Y02E60/10C08L23/06C08L2203/16C08L2203/20C08L2205/025C08L2312/08
Inventor 张珣秋田祐甫松山隼士小林博实
Owner ASAHI KASEI KK
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