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Non-aqueous electrolyte used in sodium ion battery, sodium ion battery and application

A sodium ion battery and electrolyte salt technology, applied in the field of electrolyte sodium salt, can solve the problems of poor cycle performance and low battery coulombic efficiency

Inactive Publication Date: 2013-05-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, for titanate-based sodium-ion battery anode materials, NaClO 4 Electrolyte system, low coulombic efficiency and poor cycle performance of the battery

Method used

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  • Non-aqueous electrolyte used in sodium ion battery, sodium ion battery and application
  • Non-aqueous electrolyte used in sodium ion battery, sodium ion battery and application
  • Non-aqueous electrolyte used in sodium ion battery, sodium ion battery and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example illustrates the formulation of NaFSI / EC:DMC electrolyte and its application in sodium-ion batteries using hard carbon as the working electrode.

[0032] Weigh NaFSI according to the concentration of 1M, measure organic solvent EC and DMC (volume ratio is 2:3), add molecular sieve to remove water after stirring and dissolving, and obtain the required electrolyte when the water concentration drops below 10ppm. The battery assembly and testing process is as follows: a metal sodium sheet is used as the counter electrode, the active material hard carbon electrode sheet is used as the working electrode, a glass fiber separator is added, and the NaFSI / EC:DMC electrolyte is added to assemble a CR2032 button battery. The test was carried out in constant current charge-discharge mode, the discharge cut-off voltage was 0.01V, the charge cut-off voltage was 2V, and the current density was 25mA / g. See test results figure 1 .figure 1 It is the charge-discharge curve of ...

Embodiment 2

[0037] This example illustrates the formulation of NaFSI / PC electrolyte and the use of Na 2 Ti 3 O 7 Application in sodium-ion batteries when it is the working electrode.

[0038] Weigh NaFSI according to the concentration of 1M, measure the organic solvent PC, add molecular sieve to remove water after stirring and dissolving, and obtain the required electrolyte when the water concentration drops below 10ppm. The battery assembly and testing process is as follows: the metal sodium sheet is used as the counter electrode, and the active material Na is used as the counter electrode. 2 Ti 3 O 7 The pole piece is the working electrode, the glass fiber separator is added with the NaFSI / PC electrolyte, and the CR2032 button cell is assembled. The test was carried out in constant current charge-discharge mode, the discharge cut-off voltage was 0.01V, the charge cut-off voltage was 3V, and the current density was 10mA / g. See test results image 3 . image 3 is the charge-discha...

Embodiment 3

[0043] This example illustrates the formulation of NaFSI / EC:DEC electrolyte and the use of Li 4 Ti 5 O 12 Application in sodium-ion batteries when it is the working electrode.

[0044] Weigh NaFSI according to the concentration of 1M, measure organic solvent EC and DEC (volume ratio is 2:3), add molecular sieve to remove water after stirring and dissolving, and obtain the required electrolyte when the water concentration drops below 10ppm. The battery assembly and testing process is as follows: the metal sodium sheet is used as the counter electrode, and the active material Li 4 Ti 5 O 12 The pole piece is the working electrode, the glass fiber separator is added with the NaFSI / EC:DEC electrolyte, and the CR2032 button cell is assembled. The constant current charge-discharge mode was used for testing, the discharge cut-off voltage was 0.5V, the charge cut-off voltage was 3V, and the current density was 17.5mA / g. See test results Figure 5 . Figure 5 It is the charge-d...

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Abstract

The invention discloses a non-aqueous organic electrolyte containing sodium bis(fluorosulfonyl)imide. The non-aqueous organic electrolyte comprises electrolyte salt and an organic solvent, wherein the electrolyte salt is sodium bis(fluorosulfonyl)imide. The invention also discloses a sodium ion battery. The improvement of the sodium ion battery provided by the invention is characterized in that the sodium bis(fluorosulfonyl)imide is used as the electrolyte salt. The prepared sodium ion battery has the advantages of low cost, long cycle life, high energy density and the like, can be widely applied in large-scale energy storage equipment needed for solar energy and wind power generation, as well as the fields of intelligent power grid peak shaving, distributed power stations, standby power supplies, communications base stations and the like, and is especially suitable for being used as large-scale energy storage equipment.

Description

technical field [0001] The invention relates to an electrolyte sodium salt and application thereof, in particular to a non-aqueous electrolyte used as a sodium ion battery, a sodium ion battery using the electrolyte and its application. Background technique [0002] Since its invention, lithium-ion batteries have been widely used in various small mobile devices due to their high energy density, good cycle performance, and high operating voltage. [0003] In recent years, electric-oil hybrid vehicles and pure electric vehicles powered by lithium-ion batteries have begun to develop rapidly; due to the need for storage of emerging energy such as wind power and solar energy, lithium-ion batteries are also expected to be used in "green grids". , "power" and "energy storage" have become the next application hotspots for lithium-ion batteries. [0004] However, once lithium-ion batteries are applied on a large scale in these two aspects, the problem of lithium resource shortage wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/054
CPCY02E60/12Y02E60/10
Inventor 胡勇胜赵亮潘慧霖简泽浪李泓周志彬陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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