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Organic ether electrolyte and application thereof in sodium ion battery

A sodium-ion battery, organic ether technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of high cost, easy oxidation reaction, capacity and cyclic decay, etc., to improve the oxidation voltage , The effect of improving Coulomb efficiency and cycle performance

Pending Publication Date: 2022-08-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems with ether electrolytes in sodium-ion batteries. For example, the general charging voltage is lower than 3.5V. Once the voltage is higher than this voltage, ether solvents are prone to oxidation reactions, which greatly reduces the capacity and cycle performance, resulting in ether-based sodium ions The application of batteries is greatly hindered
Document 1 (Yi Q, Lu Y, Sun X, et al. Fluorinated EtherBased Electrolyte Enabling Sodium-Metal Batteries with Exceptional Cycling Stability [J]. ACS applied materials & interfaces, 2019, 11(50): 46965-46972.) uses fluorinated ether To increase the oxidation voltage of ether electrolyte, but its cost is high and the synthesis is complicated

Method used

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  • Organic ether electrolyte and application thereof in sodium ion battery
  • Organic ether electrolyte and application thereof in sodium ion battery
  • Organic ether electrolyte and application thereof in sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The organic ether electrolyte, the specific preparation method is as follows:

[0038] In a glove box filled with argon, sodium triflate was dissolved in diethylene glycol dimethyl ether electrolyte to a final concentration of 1.0M sodium triflate, and NaNO was added to it 3 , NaNO 3 The concentration in the electrolyte is 0.1M, stirring, mixing and dissolving. The reagents used in the preparation are all dried in the glove box for more than 12 hours to prepare the electrolyte.

Embodiment 2

[0051] The organic ether electrolyte, the specific preparation method is as follows:

[0052] In a glove box filled with argon, sodium triflate was dissolved in tetraethylene glycol dimethyl ether electrolyte to a final concentration of 1.0M sodium triflate, and NaNO was added to it 3 , NaNO 3 The concentration in the electrolyte is 0.1M, stirring, mixing and dissolving. The reagents used in the preparation are all dried in the glove box for more than 12 hours to prepare the electrolyte.

Embodiment 3

[0061] The organic ether electrolyte, the specific preparation method is as follows:

[0062] In an argon-filled glove box, sodium perchlorate was dissolved in diethylene glycol dimethyl ether electrolyte to a final concentration of 1.0 M sodium perchlorate, and NaNO was added to it 3 , NaNO 3 The concentration in the electrolyte is 0.1M, stirring, mixing and dissolving. The reagents used in the preparation are all dried in the glove box for more than 12 hours to prepare the electrolyte.

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Abstract

The invention discloses an organic ether electrolyte and an application thereof in a sodium ion battery. The NaNO3 additive is introduced into the organic ether electrolyte and is applied to the sodium ion battery, an effective component is formed in a solid-liquid interface film between an electrode and the electrolyte, and an electrolyte solvent is protected, so that the oxidation voltage of the electrolyte is improved, the high-voltage ether sodium ion battery is realized, and the coulombic efficiency and the cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and relates to an organic ether electrolyte and its application in sodium ion batteries. Background technique [0002] Lithium-ion battery is a mainstream energy storage battery system, however, it needs a lot of lithium resources when it is applied to large-scale energy storage system equipment on a large scale, but the lithium resources on the earth's crust are very limited. As the same main group and relatively abundant element sodium in the earth's crust, sodium-ion batteries have a similar battery energy storage mechanism to lithium-ion batteries, and become the development direction of new battery systems in the future. [0003] Ether-based electrolytes in sodium-ion batteries have higher solubility of electrolyte salts than ester-based electrolytes, and high concentrations of electrolyte salts will reduce the occurrence of side reactions in the electrolyte, and can also genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/42H01M10/054
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M10/054H01M2300/0025
Inventor 杨梅刘子恒王星宇夏晖
Owner NANJING UNIV OF SCI & TECH
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