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Sodium-ion battery electrolyte additive containing rubidium and/or caesium cations, and applications thereof

An electrolyte additive, sodium ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that sodium ions cannot be inserted and removed.

Inactive Publication Date: 2017-10-20
SHANGHAI RUGE TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite as the negative electrode in lithium-ion batteries has good electrochemical performance, but using conventional carbonate electrolytes, sodium ions cannot be intercalated and extracted in an orderly graphite negative electrode, while hard carbon as a disordered The carbon material is the main anode material for sodium-ion batteries
However, there are no reports on the application of rubidium and / or cesium cations in the field of sodium-ion batteries.

Method used

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  • Sodium-ion battery electrolyte additive containing rubidium and/or caesium cations, and applications thereof
  • Sodium-ion battery electrolyte additive containing rubidium and/or caesium cations, and applications thereof
  • Sodium-ion battery electrolyte additive containing rubidium and/or caesium cations, and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Mix PC and EC well, add RbPF 6 Stir to dissolve, then add NaPF 6 , and finally add FEC, stir and dissolve to obtain the required electrolyte. Wherein the volume ratio of PC and EC is 4:1, RbPF 6 The concentration is 0.05mol / L, NaPF 6 The concentration of FEC is 0.8mol / L, and the mass percentage of FEC is 2% (the additive mass accounts for the percentage of the total mass of the electrolyte).

[0057] A sodium-ion battery was assembled with the above electrolyte, with metal sodium as the counter electrode, active material hard carbon as the working electrode, glass fiber separator, and CR2016 button battery.

Embodiment 2

[0059] Mix PC and EC evenly, add CsPF 6 Stir to dissolve, then add NaPF 6 , and finally add FEC, stir and dissolve to obtain the required electrolyte. Wherein the volume ratio of PC and EC is 4:1, CsPF 6 The concentration is 0.05mol / L, NaPF 6 The concentration of FEC is 0.8mol / L, and the mass percentage of FEC is 2% (the additive mass accounts for the percentage of the total mass of the electrolyte).

[0060] A sodium-ion battery was assembled with the above electrolyte, with metal sodium as the counter electrode, active material hard carbon as the working electrode, glass fiber separator, and CR2016 button battery.

Embodiment 3

[0062] Mix PC, EC and DEC evenly, add RbPF 6 Stir to dissolve, then add NaPF 6 , and finally add FEC, stir and dissolve to obtain the required electrolyte. The volume ratio of PC, EC and DEC is 4:1:5, RbPF 6 The concentration is 0.05mol / L, NaPF 6 The concentration of FEC is 0.8mol / L, and the mass percentage of FEC is 2% (the additive mass accounts for the percentage of the total mass of the electrolyte).

[0063] A sodium-ion battery was assembled with the above electrolyte, with metal sodium as the counter electrode, active material hard carbon as the working electrode, glass fiber separator, and CR2016 button battery.

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Abstract

The invention discloses a sodium-ion battery electrolyte additive containing rubidium and / or caesium cations, and applications thereof, and also discloses applications of rubidium and / or caesium cations as sodium-ion battery electrolyte additives in the field of sodium-ion battery. The sodium-ion battery electrolyte additive contains rubidium and / or caesium cations at a molar concentration of 0.01 to 0.2mol / L, an electrolyte sodium salt at a molar concentration of 0.5 to 2mol / L, and an organic solvent. The sodium-ion battery electrolyte additive containing rubidium and / or caesium cations is applied in the field of sodium-ion battery, so that the stability of sodium-ion battery anode SEI membrane is increased further, impedance is reduced, polarization of sodium-ion battery is reduced, cycling stability of sodium-ion battery is increased, and service life of sodium-ion battery is prolonged.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, in particular to a sodium ion battery electrolyte additive containing rubidium and / or cesium cations and an application thereof. Background technique [0002] In recent years, due to environmental pollution and smog induced by the greenhouse effect have become an important hidden danger to national health, energy conservation and emission reduction and green energy have gradually become important means to solve environmental pollution problems. The use of traditional fossil energy not only pollutes the environment, but also belongs to non-renewable energy. People pay more and more attention to the development and utilization of renewable energy such as water energy, solar energy, and wind energy. However, these energy sources are random and intermittent, and cannot be directly connected to the grid for people to use. They need to be converted through energy storage systems. Therefore, the deve...

Claims

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Application Information

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IPC IPC(8): H01M10/056
CPCH01M10/056Y02E60/10
Inventor 刘晶车海英陈周昊汪小平许理明马紫峰
Owner SHANGHAI RUGE TECH DEV CO LTD
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