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Polarity gel electrolyte and application thereof to solid-state lithium sulfur battery

A gel electrolyte, polarity technology, applied in non-aqueous electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problem of the shuttle effect of lithium-sulfur batteries that cannot be effectively solved, and achieve performance improvement and risk reduction. Effect

Active Publication Date: 2018-05-15
苏州德加能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this polymer cannot effectively solve the problem of the shuttle effect in lithium-sulfur batteries.

Method used

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  • Polarity gel electrolyte and application thereof to solid-state lithium sulfur battery
  • Polarity gel electrolyte and application thereof to solid-state lithium sulfur battery
  • Polarity gel electrolyte and application thereof to solid-state lithium sulfur battery

Examples

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Effect test

Embodiment 1

[0025] This embodiment provides a polar gel electrolyte, which includes a polymer matrix and a liquid electrolyte formed in the polymer matrix. The chemical reaction formula of the polymer matrix is ​​as follows figure 1 As shown, the liquid electrolyte is dissolved in 1.0M LiTFSI (bistrifluoromethanesulfonylimide lithium) and 1.0wt% LiNO 3 solution of triethylene glycol dimethyl ether. The preparation of the polymer matrix is ​​as follows: 800 mg polyethylene glycol diglycidyl ether (PEGDE) and 200 mg ethylenediamine-terminated polyethyleneimine (PEI, Sigma-Aldrich; so that the molar ratio of epoxy groups to amino groups is 1 : 1) Add 10ml of N,N-dimethylformamide (DMF) into a container, pass argon into the container for half an hour as a protective gas, then heat to 140°C and keep for 6h for polymerization to obtain a product containing ( That is, the mixed solution of the polymer matrix) (the reaction mechanism is as follows figure 1 Shown; In the present embodiment, beca...

Embodiment 2

[0030]This example provides an application of the polar gel electrolyte in Example 1 in a solid-state lithium-sulfur battery. Disperse in NMP (N-methylpyrrolidone) with a mass ratio of 8:1:1 to make a slurry evenly, coat it on an aluminum foil, and then heat it at 60°C for 24 hours until it is dried to obtain a sulfur carbon electrode; then coat it with The mixed solution of 0.5mg polymer matrix was dried at 60°C so that the polymer matrix was formed on the surface of the sulfur carbon electrode, and its electrochemical performance was as follows: Image 6 shown.

Embodiment 3

[0032] This embodiment provides a polar gel electrolyte, which is basically the same as that in Example 1, except that 900 mg of polypropylene glycol diglycidyl ether and 300 mg of polyether amine are dissolved in N,N-dimethylformamide ( DMF) solvent for polymerization.

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PUM

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Abstract

The invention relates to polarity gel electrolyte and application thereof to a solid-state lithium sulfur battery. The polarity gel electrolyte is prepared from a polymer matrix and liquid-state electrolyte formed in the polymer matrix, wherein the polymer matrix is prepared by polymerization reaction between a first organic matter containing at least two epoxy groups and a second organic matter containing at least two amino groups, and a molar ratio of the epoxy groups to the amino groups is 1 to (0.5 to 2). The polymer matrix not only can effectively limit flowing of the liquid-state electrolyte and reduce dangerousness of electrolyte leakage, but also can generate very strong interaction with polysulfide generated in a lithium sulfur battery circulation process and limit the polysulfidein a sulfur electrode very well; thus, performance of the lithium-sulfur battery is obviously improved.

Description

technical field [0001] The invention belongs to the field of solid-state lithium-sulfur batteries, and relates to a gel electrolyte, in particular to a polar gel electrolyte and its application in solid-state lithium-sulfur batteries. Background technique [0002] Due to climate warming and scarcity of non-renewable resources, we need to develop high-energy storage systems for electric vehicles and portable electronic devices. Lithium-ion batteries have been widely used in electronic power supplies due to their advantages such as high energy density and long cycle life, and have occupied a dominant position in the market. [0003] Electrolyte, as an important part of lithium-ion batteries, provides a lithium-ion transport pathway and prevents electron transfer between the cathode and anode. In addition, it is crucial to the battery's operating temperature, cycle efficiency, and especially safety issues. important. The electrolyte materials of lithium-ion batteries can be d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0565
CPCH01M10/052H01M10/0565Y02E60/10
Inventor 晏成林周金秋钱涛
Owner 苏州德加能源科技有限公司
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