Organic electrolyte with wide working temperature zone, and sodium ion battery

An organic electrolyte and sodium-ion battery technology, applied in the field of sodium-ion batteries, can solve the problems of unsuitable working temperature range and wide range of sodium-ion battery electrolyte, and achieve improved cycle life and Coulombic efficiency, high ionic conductivity, The effect of viscosity and melting point reduction

Active Publication Date: 2021-06-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose an organic electrolyte and a sodium-ion battery with a wide operating temperature range to solve the problems that the existing sodium-ion battery electrolyte is not suitable and the operating temperature range is not wide

Method used

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  • Organic electrolyte with wide working temperature zone, and sodium ion battery
  • Organic electrolyte with wide working temperature zone, and sodium ion battery
  • Organic electrolyte with wide working temperature zone, and sodium ion battery

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preparation example Construction

[0045] The preparation method of the sodium ion battery comprises: 1) preparing a bare cell; 2) configuring an electrolyte; 3) assembling the battery. This preparation method is a common method in the industry, and will not be described in detail here. The following specific examples will be described by selecting different electrolyte sodium salts, organic solvents, and positive and negative electrodes.

[0046] The sodium ion battery provided by the present invention includes the above-mentioned organic electrolyte solution with a wide working temperature range, and the organic electrolyte solution has a higher matching property when applied to a sodium ion battery. The viscosity of the liquid is kept in a more reasonable range, thereby improving the conductivity of the organic electrolyte, and at the same time, the boiling point is higher and the melting point is lower, so the working temperature range is wider and the stability is higher. Therefore, a wide working temperatu...

Embodiment 1

[0049] The present embodiment provides a kind of sodium ion battery, and concrete steps are as follows:

[0050] 1) Preparation of bare cells: stack sodium sheets, diaphragm GF-D and sodium sheets in sequence in the electrode shell under high-purity argon gas to form bare cells;

[0051] 2) Electrolyte configuration: configure the sodium ion battery electrolyte in a glove box filled with argon, wherein the electrolyte salt is sodium hexafluorophosphate, the concentration is 1M; the organic solvent is diethylene glycol dimethyl ether and 1,3- Dioxolane (volume ratio 1:1), stirring and mixing obtains the organic electrolyte of embodiment 1;

[0052] 3) Assemble the metal sodium symmetrical battery: under high-purity argon gas, drop the organic electrolyte obtained in step 2) to the bare cell, and after the cell is fully infiltrated, completely seal the battery case to obtain a sodium ion battery;

[0053] 4) Metal sodium symmetric battery test: The above-assembled metal sodium ...

Embodiment 2

[0058] The present embodiment provides a kind of sodium ion battery, and concrete steps are as follows:

[0059] 1) Preparation of bare cells: Weigh hard carbon, acetylene black and PVDF according to the mass ratio of 85:5:10, add N-methylpyrrolidone (NMP) to grind and mix, coat on aluminum foil, dry in high-purity Lay the hard carbon electrode, the diaphragm GF-D and the sodium sheet in the electrode shell at one time to form a bare cell under argon gas;

[0060] 2) Electrolyte configuration: configure the sodium ion battery electrolyte in a glove box filled with argon, wherein the electrolyte salt is sodium hexafluorophosphate, the concentration is 1M; the organic solvent is diethylene glycol dimethyl ether and 1,3- Dioxolane (volume ratio 1:1), stirring and mixing to obtain an organic electrolyte;

[0061] 3) Assembling the hard carbon battery: under high-purity argon gas, drop the organic electrolyte obtained in step 2) to the bare battery cell, and after the battery cell...

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Abstract

The invention provides an organic electrolyte with a wide working temperature zone, and a sodium ion battery. The organic electrolyte comprises an electrolyte sodium salt and an organic solvent, and the organic solvent comprises one or more of a cyclic ether solvent, a chain ether solvent and a nitrile solvent. The organic electrolyte provided by the invention has the advantages of low viscosity and melting point and high ionic conductivity, and can work in a temperature range of -50-60 DEG C; when the organic electrolyte with the wide working temperature zone is used for constructing the sodium ion battery, the working temperature of the sodium ion battery can be effectively widened, and the safety and the cycling stability of the battery are improved.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to an organic electrolyte and a sodium ion battery with a wide working temperature range. Background technique [0002] The electrolyte is an ionic conductor that conducts electricity between the positive and negative electrodes of the battery, which largely affects the capacity, cycle life and safety performance of the ion battery. Sodium-ion batteries have attracted extensive attention from researchers due to their advantages such as abundant sodium reserves, low cost, wide operating temperature range, and environmental friendliness, and are expected to become a promising next-generation energy storage system. In recent years, in order to meet some special use environments, such as aerospace and deep sea exploration, batteries are required to work in a wide temperature range (-50-60°C), which requires batteries to have higher low-temperature resistance to charge and discharge p...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/054
CPCH01M10/0569H01M10/054H01M2300/0028Y02E60/10
Inventor 尤雅林雅周星
Owner WUHAN UNIV OF TECH
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