Lithium ion battery using crosslinked separator

A technology for separators and cross-linking reactions, applied in the manufacture of lithium batteries, secondary batteries, secondary batteries, etc., can solve the problem of insufficient electrolyte affinity or liquid retention, failure to meet permeability, and failure to meet high-speed requirements. Problems such as charging and discharging or heat resistance stability

Active Publication Date: 2020-09-04
ASAHI KASEI KK
View PDF20 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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, separators above the melting point of polyolefin have insufficient affinity with the electrolyte or liquid retention due to heat-resistant stability or the electronegativity of the olefin unit, and thus cannot meet the requirements of Li ions or their solvation. Permeability of ion clusters within the separator
[0007] Thus, due to the above-mentioned limitations, it is not possible to expect high-speed charge-discharge and heat-resistant stability that are required by modern battery development.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery using crosslinked separator
  • Lithium ion battery using crosslinked separator
  • Lithium ion battery using crosslinked separator

Examples

Experimental program
Comparison scheme
Effect test

no. 8 approach

[0460] [Viscoelastic Behavior (Viscoelasticity Measurement Version 3 Explained in Examples)]

[0461] The separator of the eighth embodiment includes a polyolefin microporous membrane, and regarding the viscoelasticity measurement (version 3) described in the examples, in the solid viscoelasticity measurement at a temperature of -50°C to 250°C, the storage modulus (E') the minimum value (E' min ) is 1.0MPa ~ 10MPa, the maximum value of E' (E' max ) is 100MPa~10,000MPa, and / or the minimum value of loss modulus (E") (E" min ) is 0.1MPa ~ 10MPa, the maximum value of E" (E" max ) is from 10MPa to 10,000MPa. If at 1.0MPa≤E' min ≤10MPa and 100MPa≤E' max ≤10,000MPa, and / or 0.1MPa≤E" min ≤10MPa and 10MPa≤E” max In the range of ≤10,000MPa, there is a tendency not only to take into account the closing function of the separator and the resistance to high-temperature membrane rupture, but also to avoid production defects in the manufacturing process of the separator or the storage ...

no. 9 approach

[0467] The partition of the ninth embodiment includes:

[0468] a microporous membrane comprising a silane-modified polyolefin; and

[0469] An inorganic porous layer comprising inorganic particles and a resin binder is disposed on at least one surface of the microporous membrane.

[0470] The separator of the ninth embodiment may include layers other than the microporous membrane and the inorganic porous layer as desired.

[0471] In the ninth embodiment, the combination of a microporous membrane comprising a silane-modified polyolefin and an inorganic porous layer balances the shutdown function at a temperature lower than 150° C. and the membrane rupture property at a higher temperature, and improves the cycle characteristics of the electrical storage device And the propensity for battery stabbing safety. It is presumed that since the silane-modified polyolefin in the microporous membrane is silane-crosslinkable, once the silane crosslinking occurs, the viscosity of the re...

no. 10 approach

[0489] A separator for an electrical storage device (hereinafter also simply referred to as a "separator") according to a tenth embodiment includes a first porous layer (A layer) containing silane-modified polyolefin and capable of forming a cross-linked structure, and a second porous layer containing inorganic particles. Porous layer (layer B). The A layer and the B layer are each a single layer or a multilayer. The B layer is formed only on one surface of the A layer or on both surfaces.

[0490] In LIB, which is a typical example of an electrical storage device, lithium (Li) ions reciprocate between positive and negative electrodes. Therefore, by arranging the separator including the A layer and the B layer between the positive and negative electrodes, Li ions can be moved at a relatively high speed between the positive and negative electrodes while avoiding contact between the positive and negative electrodes.

[0491] (ratio of thickness)

[0492] The layer A functions...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Film thicknessaaaaaaaaaa
Film thicknessaaaaaaaaaa
Film thicknessaaaaaaaaaa
Login to view more

Abstract

Provided are: an electricity storage device separator containing a silane-modified polyolefin and characterized in that the silane crosslinking reaction of the silane-modified polyolefin commences upon contact with an electrolyte; and a method for manufacturing the separator.

Description

technical field [0001] The present invention relates to a separator for an electrical storage device, a crosslinking method thereof, an assembly kit for an electrical storage device, a method for manufacturing an electrical storage device, and the like. Background technique [0002] Microporous membranes are widely used as separation of various substances or selective permeation separation membranes and separators. Examples of applications include microfiltration membranes, separators for fuel cells and capacitors, or for functional Substrates of functional films that fill pores with materials to exert new functions, separators for electrical storage devices, etc. Among them, polyolefin microporous films are suitable as separators for lithium ion batteries widely used in notebook personal computers, mobile phones, digital cameras, and the like. [0003] In order to ensure battery safety, the separator is required to take into account the activation of the shutdown function ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M2/16C08J3/24C08J9/36H01G11/52H01M10/052H01M10/0566H01M10/0585H01M10/0587H01M50/403H01M50/406H01M50/417H01M50/489H01M50/491H01M50/494
CPCH01M50/494H01M50/489H01M50/491H01M10/058H01M10/0525H01M50/417H01M50/406H01G11/52H01M10/0568H01M10/04H01M50/403C08J9/28C08J2201/054C08J9/365C08J9/36C08J2201/0502C08J2323/06C08J2483/10C08J2383/10C08J2423/06C08J2423/12C08J2423/30C08J2423/36Y02E60/10Y02P70/50H01M10/4235H01M10/0569C08J3/24C08L23/06C08L23/26C08J2323/26H01M50/446
Inventor 张珣黑木谅福永悠希小林博实斋藤三都子
Owner ASAHI KASEI KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap