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Solid-state electrolyte applied to lithium battery and preparation method of solid-state electrolyte

A solid electrolyte and lithium battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low conductivity and difficulty in reaching the practical application level, and achieve high ion conductivity, high ion conductivity and electrochemical Window stability, effect of improving film formation and mechanical strength

Inactive Publication Date: 2018-06-22
SUZHOU FLUOLYTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the room temperature ionic conductivity of solid electrolytes is lower than that of liquid electrolytes, and it is difficult to reach the level of practical application.

Method used

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  • Solid-state electrolyte applied to lithium battery and preparation method of solid-state electrolyte

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preparation example Construction

[0030] An embodiment of the present invention also provides a method for preparing a solid electrolyte applied to a lithium battery as described above, the method comprising:

[0031] At the set temperature, the lithium salt is dissolved in the plastic crystal by magnetic stirring to obtain a precursor solution;

[0032] Add trimethylolpropane trimethacrylate (TMPTMA) and initiator to the precursor solution, continue to heat and magnetically stir until uniformly mixed to obtain a gel electrolyte;

[0033] The gel electrolyte is cast into a film by a solution casting method, and the solid electrolyte is obtained after cooling.

[0034] In one embodiment, the initiator is azobisisoheptanonitrile (ABVN).

[0035] In one embodiment, the method is performed in an inert gas atmosphere.

Embodiment 1

[0038] Under an argon atmosphere, mix succinonitrile (SN) and LiTFSI, dissolve LiTFSI in succinonitrile by heating and stirring, magnetically stir and control the temperature at 75°C until LiTFSI is completely dissolved, and a transparent precursor solution is obtained. Add the monomer trimethylolpropane trimethacrylate (TMPTMA) and the initiator azobisisoheptanonitrile (ABVN) into the precursor solution, continue heating to 80°C and magnetic stirring until the mixture is uniform and reaches the gel point Finally, the solution gels into a white gel-like electrolyte to obtain an electrolyte with a ratio of 98% LiTFSI-SN-2% TMPTMA, which is cast into a film by solution casting method, and a solid electrolyte 98% [LiTFSI-SN 】-2% TMPTMA.

Embodiment 2

[0040] Under an argon atmosphere, mix succinonitrile (SN) and LiTFSI, dissolve LiTFSI in succinonitrile by heating and stirring, magnetically stir and control the temperature at 75°C until LiTFSI is completely dissolved, and a transparent precursor solution is obtained. Add the monomer trimethylolpropane trimethacrylate (TMPTMA) and the initiator azobisisoheptanonitrile (ABVN) into the precursor solution, continue heating to 80°C and magnetic stirring until the mixture is uniform and reaches the gel point Finally, the solution gels into a white gel-like electrolyte, and an electrolyte with a ratio of 98% LiTFSI-SN-2% TMPTMA is obtained, which is cast into a film by solution casting method, and a solid electrolyte 95% [LiTFSI-SN 】-5% TMPTMA.

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Abstract

The invention discloses a solid-state electrolyte applied to a lithium battery and a preparation method of the solid-state electrolyte. The solid-state electrolyte at least comprises trihydroxymethylpropane trimethyl acrylate (TMPTMA), a plastic crystal and a lithium salt. The plastic crystal is used as the solid-state electrolyte of a substrate, the lithium salt can be dissociated by high polarity and high diffusion performance of a plastic crystal phase, and the prepared solid-state electrolyte is enabled to have relatively high ion conductivity and electrochemical window stability; and bycombination of a polymer and the plastic crystal, the film formation performance and the mechanical strength of the solid-state electrolyte can be improved, the plastic crystal also have an effect ofa plasticizer, and the solid-state electrolyte is enabled to have relatively high ion conductivity when the plastic crystal is wrapped in holes of the polymer.

Description

technical field [0001] The invention belongs to the technical field of energy batteries, and in particular relates to a solid electrolyte applied to a lithium battery and a preparation method thereof. Background technique [0002] At present, the main energy storage devices include chemical power storage and mechanical energy storage. Compared with mechanical energy storage, which has higher requirements on the environment, chemical energy storage such as lithium-ion batteries, lead-acid batteries, and flow batteries are widely used because of their high energy density, power density, and portability. consumer electronics and electric vehicles. [0003] Lithium-ion batteries currently on the market mainly use liquid electrolyte materials. However, since the development of liquid electrolytes, there are still many problems, such as: little potential for increasing energy density, liquid electrolytes contain a large amount of organic solvents, are prone to leakage, corrode e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 陈瀚林陈世忠
Owner SUZHOU FLUOLYTE
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