Solid electrolyte, solid lithium ion battery and preparation method of solid lithium ion battery

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

Active Publication Date: 2020-05-22
QINGDAO UNIV OF SCI & TECH
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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 objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to embodiments.

[0036] In an embodiment of the solid electrolyte of the present invention, the solid electrolyte is composed of polyethylene oxide PEO, bistrifluoromethylsulfonimide LiTFSI, branched polymethyl methacrylate PMTFSI and silicon dioxide SiO 2 A quaternary solid polymer electrolyte formed by cross-linking under light initiation. Among them, polyethylene oxide PEO, bis-trifluoromethyl sulfonimide LiTFSI, branched polymethyl methacrylate PMTFSI, silica SiO 2 These four substances need to meet the molar ratio of (8-10): (1-2): (2-3): (1-2).

[0037] For the quaternary solid polymer electrolyte formed by photo-initiated cross-linking, it needs to be prepared by a specific method. Specifically, an embodiment of the method for preparing the quaternary solid polymer electrolyte include...

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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 specifically relates to a solid electrolyte, a solid lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have successfully occupied the electronic product market, but their performance in the field of electric vehicles (EV) is far from satisfactory. The main reason is that while LIBs meet the demand for high energy density, safety issues remain main problem. Frequent electric vehicle fire accidents have caused considerable concern about LIBs. Battery safety issues are caused by different reasons, such as overcharging, abuse, internal or external short circuit of the battery, etc., but these are more or less related to the use of volatile, flammable and toxic liquid organic carbonate-based electrolytes with lithium-ion batteries related. [0003] Compared with traditional liquid organic carbonate-based electrolytes, solid p...

Claims

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Application Information

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