Electrolyte for improving high-temperature cycle performance of sodium-ion battery

A sodium ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effects of inhibiting decomposition, good sodium ion transport capacity, and improving cycle stability

Pending Publication Date: 2022-08-05
深圳名飞远科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the basic principle of sodium-ion batteries is similar to that of lithium-ion batteries, the half-cell potential of sodium ions is 0.3V higher than that of lithium ions, and the radius of sodium ions is much larger than that of lithium ions, so it is suitable for electrolysis of lithium-ion batteries Liquid additives are not necessarily suitable for sodium-ion batteries, such as vinylene carbonate can enhance the cycle stability of lithium-ion batteries, but it is counterproductive in sodium-ion batteries

Method used

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  • Electrolyte for improving high-temperature cycle performance of sodium-ion battery
  • Electrolyte for improving high-temperature cycle performance of sodium-ion battery
  • Electrolyte for improving high-temperature cycle performance of sodium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In a glove box with moisture less than 0.1 ppm, oxygen content less than 0.1 ppm and filled with argon gas, diethyl carbonate and ethylene carbonate were mixed uniformly in a volume ratio of 60:40, and NaClO was added. 4 , the molar concentration of sodium salt is 1mol / L, mix well, then add bis-[3-(triethoxysilyl)propyl]-disulfide, bis-[3-(triethoxysilyl)propyl The mass concentration of ]-disulfide is 2%, and the mixture is uniform to obtain the electrolyte.

Embodiment 2

[0023] In a glove box with a moisture content of less than 0.1 ppm and an oxygen content of less than 0.1 ppm and filled with argon, mix ethyl methyl carbonate and propylene carbonate in a volume ratio of 55:45, and add NaPF 6 , the molar concentration of sodium salt is 0.5mol / L, mix well, then add bis-[3-(triethoxysilyl)propyl]-disulfide, bis-[3-(triethoxysilyl)propyl] The mass concentration of the base]-disulfide is 3%, and the mixture is uniform to obtain the electrolyte.

Embodiment 3

[0025] In a glove box with moisture less than 0.1ppm and oxygen content less than 0.1ppm and filled with argon, diethyl carbonate, ethyl methyl carbonate and ethylene carbonate were mixed uniformly in a volume ratio of 40:30:30, and NaFSI was added. The molar concentration of sodium salt is 1.5mol / L, mix well, then add bis-[3-(triethoxysilyl)propyl]-disulfide, bis-[3-(triethoxysilyl)propyl The mass concentration of ]-disulfide is 5%, and the mixture is uniform to obtain the electrolyte.

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Abstract

The invention discloses an electrolyte for improving the high-temperature cycle performance of a sodium-ion battery, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, an organic solvent and an additive, and the additive is bis-[3-(triethoxysilyl) propyl]-disulfide; according to the invention, the additive and the organic solvent in a specific ratio are added into the electrolyte, so that the electrolyte has good sodium ion transport capacity, the decomposition of the electrolyte on the surface of an electrode material is inhibited, and the cycling stability, especially the high-temperature cycling performance, of the sodium ion battery is improved.

Description

Technical field: [0001] The invention relates to the technical field of sodium ion batteries, in particular to an electrolyte for improving the high temperature cycle performance of the sodium ion battery. Background technique: [0002] A sodium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of sodium ions between the positive and negative electrodes to work, similar to the working principle of a lithium-ion battery. During charging and discharging, Na + Insertion and extraction back and forth between the two electrodes. When charging, Na + It is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte; the opposite is true during discharge. The electrode materials used in sodium-ion batteries are mainly sodium salts, which are more abundant and cheaper than lithium salts. Because sodium ions are larger than lithium ions, sodium-ion batteries are a cost-effective alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/054
CPCH01M10/0567H01M10/0569H01M10/054H01M2300/0025Y02P70/50
Inventor 许名飞许赫奕王飞蓉许银梅
Owner 深圳名飞远科技有限公司
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