Additive for sodium-ion battery electrolyte, electrolyte and sodium-ion battery

A sodium-ion battery and additive technology, applied in the field of sodium batteries, can solve the problems of poor cycle performance and rate performance of sodium-ion batteries, and achieve the effects of improving electrochemical performance, reducing losses, and reducing resistance

Pending Publication Date: 2022-01-11
SO-FUN TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is to provide an additive for the electrolyte of a sodium-ion battery to solve the problems of poor cycle performance and rate performance of the current sodium-ion battery

Method used

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  • Additive for sodium-ion battery electrolyte, electrolyte and sodium-ion battery
  • Additive for sodium-ion battery electrolyte, electrolyte and sodium-ion battery
  • Additive for sodium-ion battery electrolyte, electrolyte and sodium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A kind of additive for sodium-ion battery electrolyte, comprises the first additive, the second additive and the third additive, the first additive is the compound shown in formula 1, the second additive is the compound shown in formula 3, the third additive For fluoroethylene carbonate.

[0043] The additive is applied in the electrolyte solution of the sodium ion battery, the electrolyte solution also includes sodium salt and an organic solvent, wherein the mass of the additive is 2 to 20% of the total mass of the electrolyte solution, the first additive and the second The sum of the masses of the two additives is a, the mass ratio of the first additive to the second additive is 2:1, the mass of the third additive is b, a:b=1:2.

[0044] The preparation method of this electrolyte is:

[0045] 1) In a nitrogen-filled glove box (O2 2 (0<3ppm), prepare an organic solvent, the organic solvent is composed of EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl...

Embodiment 2

[0054] The difference from Example 1 is the setting of electrolyte additives.

[0055] The parts by weight of the sodium salt solution, the organic solvent, (the first additive+the second additive), and the third additive are 14 parts, 81 parts, 3 parts and 2 parts.

[0056] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0058] The difference from Example 1 is the setting of electrolyte additives.

[0059] The parts by weight of the sodium salt solution, the organic solvent, (the first additive+the second additive), and the third additive are 14 parts, 79 parts, 5 parts and 2 parts.

[0060] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides an additive for a sodium-ion battery electrolyte, the electrolyte and a sodium-ion battery, the additive comprises a first additive and a second additive, the first additive is a compound as shown in a formula I, and the second additive is a compound as shown in a formula II. Compared with the prior art, the sodium-ion battery electrolyte comprises at least two additives, so that the cycle performance and the rate capability of the battery can be obviously improved. Specifically, the first additive can spontaneously react with trace water and hydrofluoric acid in the electrolyte, so that the hydrolysis of sodium hexafluorophosphate is inhibited, the corrosion of hydrofluoric acid, phosphorus pentafluoride and other products on the positive electrode material is prevented, the stability of the material and the electrolyte is improved, and the electrochemical performance of the sodium-ion battery is improved; the second additive can form a stable interfacial film on the surfaces of the positive electrode and the negative electrode, and an organic sodium-rich interfacial film formed on the positive electrode can effectively inhibit transition metal in the positive electrode from being dissolved into electrolyte, so that the loss of active substances is reduced, and the resistance is improved.

Description

technical field [0001] The invention relates to the field of sodium batteries, in particular to an additive for an electrolyte solution of a sodium ion battery, an electrolyte solution and a sodium ion battery. Background technique [0002] Because of its large reserves in the earth's crust, sodium-based materials are cheaper than lithium-based materials, so sodium-ion batteries have attracted much attention in the field of energy storage. However, sodium-ion batteries are affected by poor rate performance, cycle performance and low first effect, which restricts their wide application. [0003] The electrolyte is the "bridge" connecting the positive and negative electrodes in the sodium-ion battery, which affects the battery cycle, rate performance and other performance. Among the three components of the electrolyte, the formulations of sodium salt and solvent do not change much, and additives are the key factors to improve the performance of sodium-ion batteries. Therefore...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/054
CPCH01M10/0567H01M10/054H01M2300/0025H01M2300/0091Y02E60/10
Inventor 黄玉希刘鹏徐雄文王志斌
Owner SO-FUN TECH CORP LTD
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