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Electrolyte for sodium ion battery, preparation method, and sodium ion battery comprising the electrolyte for sodium ion battery

A sodium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of unfavorable application and promotion of sodium-ion batteries, harsh operating environment and application environment, easy decomposition to produce hydrofluoric acid, etc., and achieve battery The effect of low environmental requirements, low moisture sensitivity and low price

Active Publication Date: 2020-01-14
REAL POWER IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, they did not get rid of expensive electrolytes that are very sensitive to water and oxygen content, making these electrolytes more harsh on the operating environment and application environment. For example, the commonly used sodium hexafluorophosphate is very sensitive to water content and is easy to decompose to produce hydrogen. Hydrofluoric acid, leading to battery performance deterioration; sodium perchlorate is prone to safety hazards due to its strong oxidation; therefore, the existing electrolyte is not conducive to the application and promotion of sodium ion batteries

Method used

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  • Electrolyte for sodium ion battery, preparation method, and sodium ion battery comprising the electrolyte for sodium ion battery
  • Electrolyte for sodium ion battery, preparation method, and sodium ion battery comprising the electrolyte for sodium ion battery
  • Electrolyte for sodium ion battery, preparation method, and sodium ion battery comprising the electrolyte for sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-27 and comparative example 1-4

[0048] Respectively use different electrolytes (listed in Table 1) as the electrolyte of the sodium-ion battery, and use Na with a specific capacity of 100mAh / g 2 Fe 2 (SO 4 ) 3 It is the positive electrode active material, and PVDF and conductive carbon black are coated on aluminum foil at a mass ratio of 95:3:2 as the positive electrode sheet, the negative electrode is tin foil, and the separator is celgard 2400 polypropylene porous membrane, assembled into a sodium ion battery, and recorded respectively Be embodiment 1-27 and comparative example 1-4.

[0049] It should be noted that the solvents in Examples 1-9 are all the same, the difference is that the electrolyte concentration is different, wherein, the electrolyte concentration in Examples 2-9 is within the preferred concentration range of the present invention.

[0050] The electrolyte concentration of embodiment 10-16 is identical with embodiment 3, and difference is that the proportioning of solvent is different ...

Embodiment 28-39

[0072] Sodium-ion batteries were assembled with electrolytes with different formulations, different positive electrodes and different negative electrodes, and were respectively recorded as Examples 28-39.

[0073] Table 2 shows the performance test results of sodium-ion batteries obtained with different positive electrodes, negative electrodes and electrolyte formulations.

[0074] Sodium ion battery performance test result in table 2 embodiment 28-39

[0075]

[0076]

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Abstract

The invention relates to the field of secondary battery and particularly provides an electrolyte solution for a sodium-ion battery, a preparation method and a sodium-ion battery comprising the electrolyte solution for the sodium-ion battery. The electrolyte solution for the sodium-ion battery comprises an electrolyte and a solvent, wherein the electrolyte mainly is sodium nitrate; and the polarityof the solvent is greater than or equal to 4. The electrolyte solution has the advantages of being low in price, high in security, low in sensitivity to moisture and low in requirement on the batterypreparation environment. The sodium-ion battery comprising the electrolyte solution for the sodium-ion battery has the advantages of being high in charge-discharge efficiency, good in cycle performance, high in security, wide in operating temperature range and low in cost.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to an electrolyte solution for a sodium ion battery, a preparation method and a sodium ion battery containing the electrolyte solution for a sodium ion battery. Background technique [0002] With the rapid development of electronic equipment, electric tools, electric vehicles and other industries, the market demand for high-energy, long-cycle, high-safety, and low-cost batteries is increasing. At present, lithium-ion batteries are the most widely used high-energy battery system. However, as industries such as digital and transportation rely more heavily on lithium-ion batteries, limited lithium resources will inevitably face shortages. Lithium and sodium are in the same main group and adjacent in the periodic table, and have very similar physical and chemical properties; at the same time, sodium-ion batteries are rich in sodium resources, cheap and evenly distributed in the earth'...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0563H01M10/054
CPCY02E60/10
Inventor 唐永炳谢呈德方月
Owner REAL POWER IND LTD
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