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A self-crosslinking gel polymer electrolyte for lithium-ion batteries

A gel polymer and lithium-ion battery technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolyte immobilization/gelation, etc., can solve the problems of high equipment, high gamma radiation, human injury, implementation difficulties, etc. question

Active Publication Date: 2018-06-19
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common point of these two typical chemical cross-linking methods is the addition of additives such as cross-linking agents or initiators in the on-site polymerization, which leads to the inevitable introduction of impurities into the gel electrolyte, which adversely affects the stability of the gel electrolyte.
Although it has also been reported that γ-rays are used to directly irradiate polymer monomers to polymerize without adding any initiators, the high radiation of γ-rays will cause harm to the human body, and the requirements for equipment are very high, so it is very difficult to implement.

Method used

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  • A self-crosslinking gel polymer electrolyte for lithium-ion batteries
  • A self-crosslinking gel polymer electrolyte for lithium-ion batteries
  • A self-crosslinking gel polymer electrolyte for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 1.32g of lithium bisoxalate borate (LiBOB) into 5ml of propylene carbonate (PC) to dissolve completely. At room temperature, add 2g of silylmethoxy-terminated polypropylene oxide to the electrolyte solution of lithium bisoxalate borate and propylene carbonate and stir evenly (indicate the viscosity number average molecular weight), and then place on a polytetrafluoroethylene plate, With the cellulose membrane as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose membrane, and then heated in an oven at 45°C for 20 hours, the polymer electrolyte solidified and formed a film by itself. The mass fraction of the cross-linked polyether in the gel electrolyte after curing into a film is 25% (excluding the cellulose film).

Embodiment 2

[0031] Dissolve 0.88 g of lithium bis(salicylate) borate (LBSB) into 5 ml of propylene carbonate (PC) and ethylene carbonate (EC) (v:v = 1:1) to dissolve completely. At room temperature, add 2g of silicon methoxy-terminated polyethylene oxide to the electrolyte solution of lithium bisoxalate borate and propylene carbonate and stir evenly, and then place it on a polytetrafluoroethylene plate with a cellulose membrane as the supporting framework , the uniformly stirred polymer electrolyte was scraped onto both sides of the cellulose membrane, and then heated in an oven at 45°C for 18 hours, the polymer electrolyte solidified into a film by itself. The mass fraction of the cross-linked polyether in the gel electrolyte is 27% (except for the cellulose film).

Embodiment 3

[0033] Dissolve 1.12 g of lithium bismalonate borate (LiBMB) into 5 ml of propylene carbonate (PC) and ethylene carbonate (EC) (v:v = 1:1) to dissolve completely. At room temperature, add 3 g of silicon methoxy-terminated polyethylene oxide to the electrolyte solution of lithium bisoxalate borate and propylene carbonate and stir evenly, and then place it on a polytetrafluoroethylene plate with a polyimide porous membrane In order to support the skeleton, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the polyimide film, and then heated in an oven at 45°C for 10 hours, the polymer electrolyte cured itself to form a film. The mass fraction of the cross-linked polyether in the gel electrolyte after curing to form a film is 38% (except for the polyimide film).

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Abstract

The invention relates to a novel polymer electrolyte for lithium ion batteries and a preparation method thereof. In the invention, the silicon methoxy-terminated polyether oligomer is used as a matrix polymer, and the lithium boric acid salt is not only used as a lithium source, but also can catalyze the in-situ crosslinking of the matrix polymer, so as to prepare a terminal group crosslinked polymer electrolyte. The polymer electrolyte has good strength and self-supporting properties, good flexibility and a wide electrochemical stability window (4.7 V), with a certain amount of solvent can achieve a more ideal ionic conductivity (up to 10‑3 S cm‑1), suitable for power lithium batteries and flexible lithium batteries for wearable devices.

Description

technical field [0001] The invention belongs to the field of polymer electrolytes for lithium ion batteries, and relates to a polymer electrolyte with self-crosslinking properties and a preparation method thereof. Background technique [0002] The replacement of traditional liquid electrolyte by polymer electrolyte has transformative significance for the development of lithium secondary batteries, because of its high safety and plastic shape, it is one of the ideal electrolytes for flexible batteries used in wearable electronic devices. [0003] Polymer electrolytes include all-solid polymer electrolytes and gel polymer electrolytes. However, all-solid-state electrolytes represented by polyethylene oxide polymer electrolytes have not been widely used so far due to their low ionic conductivity at room temperature and narrow electrochemical stability window. Traditional physically cross-linked gel polymer electrolytes are generally formed by linear polymers after absorbing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 崔光磊王庆富张宁徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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