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Electrolyte with high solvent-sodium salt ratio and sodium ion battery

A sodium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor wettability of pole pieces and separators, affecting high-temperature cycle performance, affecting low-temperature cycle performance, etc. Temperature range, good cycle performance, good wettability

Pending Publication Date: 2021-08-24
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will lead to poor wettability of the electrolyte on the pole piece and diaphragm, which will affect the low-temperature cycle performance
When applied under high temperature conditions, the decomposition of anions is intensified at high temperature, and the by-products increase, which will also affect the high temperature cycle performance
[0005] There are also common methods in the industry to use film-forming additives in the electrolyte to improve the stability of the electrode-electrolyte interface layer and battery cycle stability. High counter electrode wettability and other issues

Method used

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  • Electrolyte with high solvent-sodium salt ratio and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The preparation method of electrolyte is as follows:

[0056] At room temperature, in a glove box with water content and oxygen content less than 0.1ppm, mix ethylene carbonate (EC) and propylene ester (PC) at a volume ratio of 1:1 to form a solvent, and add it to the solvent according to solvent: sodium salt =20:1 (molar ratio) adding sodium hexafluorophosphate (NaPF 6 ) into a mixed solution, dissolved completely, and left to stand for 24 hours for later use.

[0057] NaCu 1 / 9 Ni 2 / 9 Fe 1 / 3 mn 1 / 3 o 2 As the positive active material, hard carbon is used as the negative active material, glass fiber is used as the diaphragm, and the above electrolyte is used to assemble the CR2032 button battery according to the usual process.

Embodiment 2-26 and comparative example 1-17

[0059] According to the implementation method of Example 1, change the molar ratio of solvent and sodium salt, the type of sodium salt, the type of solvent, the positive electrode active material and the negative electrode active material in Example 1, obtain Example 2-26 and Comparative Example 1-17, electrolysis The composition of the solution and the electrode active materials used are shown in Table 1.

[0060] Table 1: Electrolyte composition and electrode active material selection of Examples 1-26 and Comparative Examples 1-17:

[0061]

[0062]

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Abstract

The invention discloses an electrolyte with a high solvent-sodium salt ratio and a sodium ion battery. The electrolyte comprises sodium salt, a solvent and an additive, wherein the molar ratio of the solvent to the sodium salt is (20: 1)-(70: 1), and the addition amount of the additive accounts for 0.5%-5% of the mass of the electrolyte; the sodium salt comprises one or more of sodium perchlorate (NaClO4), sodium tetrafluoroborate (NaBF4), sodium hexafluorophosphate (NaPF6), sodium hexafluoroarsenate (NaAsF6), sodium trifluoroacetate (CF3COONa), sodium tetraphenylborate (NaB(C6H5)4), sodium trifluoromethanesulfonate (NaSO3CF3), sodium bis (fluorosulfonyl) imide (Na[(FSO2)2N]) or sodium bis (trifluoromethanesulfonyl) imide (Na[(CF3SO2)2N]).

Description

technical field [0001] The invention relates to the technical field of sodium battery materials, in particular to an electrolyte with a high solvent-sodium salt ratio and a sodium ion battery. Background technique [0002] Na-ion batteries have long been considered as a useful complement to lithium-ion batteries due to their low cost and abundant sources. Sodium, an element in the same main group as lithium, has very similar physical and chemical properties to lithium, and the abundance of sodium on the earth is higher than that of lithium, and the cost is lower, so the development of sodium-ion batteries as large-scale energy storage devices has become a A better choice. Up to now, the research on related technologies of Na-ion batteries has attracted extensive attention in both academic and industrial fields. [0003] Sodium-ion battery electrolyte is the carrier of ion transport in sodium-ion batteries. Generally composed of sodium salt and organic solvent. The electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M10/0567H01M10/0568H01M10/0569
CPCH01M10/054H01M10/0568H01M10/0569H01M10/0567Y02E60/10
Inventor 胡勇胜杨佯李钰琦陆雅翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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