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Sodium ion battery electrolyte additive, electrolyte and sodium ion battery

An electrolyte additive, sodium ion battery technology, applied in electrolytes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of restricted application, low initial efficiency, poor cycle performance of sodium ion batteries, etc. The effect of low internal resistance, film formation resistance, and improved battery cycle and high temperature storage performance

Pending Publication Date: 2021-10-08
SO-FUN TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, sodium-ion batteries also have disadvantages such as poor cycle performance, high-temperature storage flatulence, and low initial efficiency, which restrict their wide application.

Method used

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  • Sodium ion battery electrolyte additive, electrolyte and sodium ion battery
  • Sodium ion battery electrolyte additive, electrolyte and sodium ion battery
  • Sodium ion battery electrolyte additive, electrolyte and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Positive electrode preparation: the positive electrode material Na 1.72 MnFe(CN) 6 , binder PVDF, and conductive agent Super-P are dispersed in NMP organic solvent at a mass ratio of 90:4:6, stirred until stable and uniform under the action of a vacuum mixer, and evenly coated on an aluminum foil with a thickness of 12 μm. After the aluminum foil was dried at room temperature, it was transferred to a blast oven at 120° C. to dry for 1 hour, and then cold pressed and die-cut to form a positive electrode sheet.

[0042] Negative electrode preparation: According to the mass ratio of 97:2:1, spherical hard carbon, binder PVDF, and conductive agent Super-P are mixed together, dispersed in NMP organic solvent, and evenly coated on aluminum foil with a thickness of 15 μm. After the aluminum foil was dried at room temperature, it was transferred to a blast oven at 120°C to dry for 1 hour, and then cold pressed and die-cut to form a negative electrode sheet.

[0043] Electroly...

Embodiment 2

[0051] The difference from Example 1 is that the sodium salt solution, organic solvent, additive a and additive b are 14 parts, 82 parts, 2 parts and 2 parts by weight.

[0052] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0054] The difference from Example 1 is that the sodium salt solution, organic solvent, additive a and additive b are 14 parts, 79 parts, 5 parts and 2 parts by weight.

[0055] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery electrolyte additive, an electrolyte and a sodium ion battery. The additive a comprises at least one of compounds shown in a formula I and a formula II; in the formula I and the formula II, R1-R15 are independently selected from one of H, halogen atoms, alkane groups, unsaturated alkyl groups, alkoxy groups and alkanoyl groups respectively; H in the alkane group, the unsaturated alkyl group, the alkoxy group and the alkanoyl group can be partially or completely substituted by one or more of halogen atoms, cyano groups, carboxyl groups and sulfonic acid groups; the additive b is one or more of ethylene carbonate, fluoroethylene carbonate, vinylethylene carbonate, ethylene sulfate and allyl sultone. The electrolyte additive can form a stable and compact interface film on the surfaces of a positive electrode and a negative electrode, reduces side reaction with an electrolyte, reduces gas generation, and enables the cycle performance and the high-temperature performance of a battery to be better.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to an electrolyte additive for a sodium ion battery, an electrolyte and a sodium ion battery. Background technique [0002] Sodium is one of the most abundant elements on the earth. Its working principle is similar to that of lithium-ion batteries. At the same time, it has the advantages of low cost, good safety, and long-term large-scale storage. It has attracted more and more attention from researchers. The electrode materials used in sodium-ion batteries are mainly sodium salts, which are more abundant and cheaper than lithium salts. Since sodium ions are larger than lithium ions, sodium-ion batteries are a cost-effective alternative when weight and energy density are not critical. [0003] Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Na-salt raw materials are rich in reserves and low in price. Compared wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/054H01M10/42
CPCH01M10/0567H01M10/054H01M10/4235H01M2300/0091Y02E60/10
Inventor 刘鹏徐雄文王志斌
Owner SO-FUN TECH CORP LTD
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