Sodium ion composite polymer solid electrolyte and preparation method thereof

A composite polymer and solid-state electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of restricting the promotion and application of flexible electronic devices, low load of electrode active materials, and volume changes of electrode materials. Improving ionic conductivity and electrochemical performance, high adhesion, and the effect of alleviating agglomeration

Pending Publication Date: 2022-07-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, liquid electrolytes are mostly used as electrolytes for power supplies, but they generally have problems such as corrosion, leakage, and volatility, and require additional high-cost packaging, which limits their further promotion and application in the field of flexible electronic devices.
[0005] At present, the development of solid-state sodium-ion batteries with superior performance still faces many scientific and technical challenges, such as: low ionic conductivity, large interface (electrode / solid electrolyte) impedance, volume change of electrode materials, and low load of electrode active materials. , and poor cycle stability
And at present, most of them use liquid electrolyte as the electrolyte of the power supply, but it generally has problems such as easy corrosion, easy leakage, and easy volatilization, which requires additional high-cost packaging, which limits its further promotion and application in the field of flexible electronic devices

Method used

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  • Sodium ion composite polymer solid electrolyte and preparation method thereof
  • Sodium ion composite polymer solid electrolyte and preparation method thereof
  • Sodium ion composite polymer solid electrolyte and preparation method thereof

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preparation example Construction

[0037] A preparation method of sodium ion composite polymer solid electrolyte, comprising the following steps:

[0038] S1: Precursor Solution Preparation

[0039] The polymer is dissolved in the organic solvent by magnetic stirring, and ethyl cellulose is added and stirred again until the solution becomes a transparent solution, and sodium salt and active filler are added into the transparent solution, and the precursor solution is obtained by magnetic stirring;

[0040] S2: Preparation of composite polymer solid electrolyte

[0041] The precursor solution is injected into a preset mold, dried to remove the organic solvent and formed into a composite polymer solid electrolyte membrane, taken out from the preset mold and dried to obtain a sodium ion composite polymer solid electrolyte membrane.

[0042]In the step of preparing the precursor solution, the preparation process adopts the preset sodium salt, the preset sodium electrolytic solution concentration and the first pres...

Embodiment 1

[0065] (1) Preparation of precursor solution: Weigh PEO in the proportion of 30wt.% and dissolve it in acetonitrile solution and stir, after complete dissolution, add 1wt.% ethyl cellulose and continue stirring until the solution is transparent, and then add 0.5wt.% NASICON active filler and 0.5vol.% sodium salt and continue to stir, the sodium salt is a mixed solution of sodium perchlorate, dimethyl carbonate and ethyl methyl carbonate, the concentration is 1mol / L, the stirring time is 24h, and the rotating speed is 800r / min; A homogeneous mixed solution of polymer, organic solvent, ethyl cellulose, sodium salt and active material completely solvent is obtained.

[0066] (2) Preparation of composite polymer solid electrolyte: the mixed solution obtained in step (1) is slowly poured into a polytetrafluoroethylene mold, and placed in a vacuum drying box with a temperature of 80 ° C for 24 hours to remove the above-mentioned organic solvent, A composite solid-state electrolyte m...

Embodiment 2

[0069] (1) Preparation of precursor solution: Weigh PEO in the proportion of 40wt.% and dissolve it in acetonitrile solution and stir, after complete dissolution, add 10wt.% ethyl cellulose and continue stirring until the solution is transparent, then add 40wt.% NASICON active filler and 10vol.% sodium salt and continue to stir, the sodium salt is a mixed solution of sodium perchlorate, dimethyl carbonate and ethyl methyl carbonate, the concentration is 0.8mol / L, the stirring time is 12h, and the rotating speed is 1000r / min; A homogeneous mixed solution of polymer, organic solvent, ethyl cellulose, sodium salt and active material in complete solvent.

[0070] (2) Preparation of composite polymer solid electrolyte: the mixed solution obtained in step (1) is slowly poured into a polytetrafluoroethylene mold, and placed in a vacuum drying box with a temperature of 100 ° C for 12 hours to remove the above-mentioned organic solvent, A composite solid-state electrolyte membrane was ...

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Abstract

The invention discloses a sodium ion composite polymer solid electrolyte and a preparation method thereof, and relates to the technical field of high polymer materials and new energy materials. According to the sodion composite polymer solid electrolyte disclosed by the invention, the active filler is added into the cellulose-based gel polymer electrolyte, so that the ionic conductivity and the electrochemical performance of the composite polymer solid electrolyte are improved; the composite polymer solid electrolyte with high ionic conductivity, flexibility, light weight, high mechanical strength and adhesiveness is obtained; meanwhile, the invention discloses a preparation method of the composite polymer solid electrolyte, the cycle life and the electrochemical performance of the all-solid-state sodium ion battery using the composite polymer solid electrolyte are optimized, and all-solid-state of the sodium ion battery is realized.

Description

technical field [0001] The invention relates to a sodium ion composite polymer solid electrolyte and a preparation method thereof, and relates to the technical field of polymer materials and new energy materials. Background technique [0002] Rechargeable batteries are one of the cornerstones of the green energy transition and will play a key role in the decarbonisation and electrification of the global economy. Efficient, sustainable and safe batteries have great potential to reduce the consumption of natural resources and environmental pollution caused by fossil fuels, so its development will facilitate the transition to a circular economy model. [0003] Sodium-ion batteries have re-entered the field of sustainable energy storage as a viable alternative to the ubiquitous lithium-ion batteries. Compared with lithium-ion batteries, sodium-ion batteries have a lower impact on global warming, fossil consumption, and freshwater eutrophication. Sodium is naturally abundant (2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/054H01M10/058
CPCH01M10/0565H01M10/054H01M10/058H01M2220/30H01M2300/0085H01M2300/0091Y02P70/50
Inventor 侯敏杰姚正银梁风赵兰清周英杰杨泻铖苏咸凯解志鹏刘轶昌马龙任昆陈宇能
Owner KUNMING UNIV OF SCI & TECH
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