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Solid electrolyte, solid lithium ion battery and preparation method thereof

A solid-state electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of poor stability of high-pressure oxidation of ethylene oxide chains, limiting the application of solid-state lithium-ion batteries, and low voltage of solid-state lithium-ion batteries, etc. problem, to achieve the effect of large elastic deformation range, wide application range and not easy to short circuit

Active Publication Date: 2020-10-30
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the highest occupied molecular orbital (HOMO) of PEO is quite low, resulting in poor high-pressure oxidation stability of the ethylene oxide chain.
Therefore, solid polymer electrolytes based on PEO can only be limited to 3 V-level positive electrode materials. Therefore, the prepared solid-state lithium-ion batteries have low voltage and are difficult to assemble into high-power batteries suitable for electric vehicles, which limits the use of solid-state lithium-ion batteries in Applications in the field of electric vehicles

Method used

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments.

[0036] In an embodiment of a solid electrolyte of the present invention, the solid electrolyte is made of polyethylene oxide PEO, two trifluoromethylsulfonimide LiTFSI, branched polymethyl methacrylate PMTFSI and silicon dioxide SiO 2 A quaternary solid polymer electrolyte cross-linked under photoinitiation. Among them, polyethylene oxide PEO, bistrifluoromethylsulfonimide LiTFSI, branched polymethyl methacrylate PMTFSI, silicon dioxide SiO 2 These four substances need to meet the molar ratio of (8-10): (1-2): (2-3): (1-2).

[0037] For photo-induced cross-linking of quaternary solid polymer electrolytes, it needs to be prepared by a specific method. Specifically, an embodiment of a method for preparing the quaternary solid polymer electrolyte includes the following steps:

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Abstract

The invention discloses a solid electrolyte, a solid lithium ion battery and a preparation method of the solid lithium ion battery. The solid electrolyte is a quaternary solid polymer electrolyte formed by crosslinking polyethylene oxide, bis(trifluoromethylsulfonyl)imide, branched chain polymethyl methacrylate and silicon dioxide in a molar ratio of (8-10): (1-2): (2-3): (1-2) under photo-initiation, and is a solid electrolyte adapted to a 4V high-voltage positive electrode material. The solid lithium ion battery comprises a 4V-grade elastic positive electrode layer, a solid electrolyte layerand an elastic negative electrode layer which are packaged by packaging films, and is an elastic solid lithium ion battery with 4V high-voltage output.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a solid electrolyte, a solid lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have successfully captured the market for electronic products, but their performance in the field of electric vehicles (EVs) is far from satisfactory, mainly because LIBs meet the demand for high energy density while safety concerns remain primary issue. Frequent electric vehicle fire accidents have raised considerable concerns about LIBs. Battery safety issues are caused by different reasons, such as overcharging, abuse, short circuit inside or outside the battery, etc., but these are more or less related to the use of volatile, flammable and toxic liquid organic carbonate-based electrolytes in lithium-ion batteries. related. [0003] Compared with traditional liquid organic carbonate-based electrolytes, solid-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 顾圆春刘光烨
Owner QINGDAO UNIV OF SCI & TECH