High-temperature sodium ion battery electrolyte, functional additive and sodium ion battery

A sodium-ion battery and functional additive technology, which is applied in the high-temperature sodium-ion battery electrolyte, functional additive and sodium-ion battery fields, can solve problems such as poor performance at low temperature, high viscosity of the electrolyte, and poor wetting of the pole piece. Achieve the effects of improving high-temperature cycle performance, improving dissolution, and reducing continuous decomposition

Pending Publication Date: 2022-04-15
江苏蓝固新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are certain deficiencies in the above-mentioned technical means for solving the high temperature problem.
For example: reducing the amount of electrolyte will result in poor wetting of the electrode sheet and high impedance; high salt concentration electrolyte has high cost, and the viscosity of the electrolyte is high and the wettability is poor; the current technical improvements are mainly aimed at the negative electrode, and some cannot be well balanced Low temperature performance, narrow application range

Method used

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  • High-temperature sodium ion battery electrolyte, functional additive and sodium ion battery
  • High-temperature sodium ion battery electrolyte, functional additive and sodium ion battery
  • High-temperature sodium ion battery electrolyte, functional additive and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Electrolyte solution A is prepared by using the compound represented by formula (II).

[0035]

[0036] In a glove box with moisture less than 0.1ppm, oxygen less than 0.1ppm, and filled with argon, ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 3: 2: Mix evenly in a ratio of 5, add bisfluorosulfonimide sodium salt (NaFSI), the concentration of sodium salt is 1 mol L -1 , respectively add auxiliary additives ethylene carbonate (VC), 1,3-propane sultone (PS) and vinyl sulfate (DTD) according to 1%, 1%, and 1% of the total mass fraction of the electrolyte, and then add 5 wt% of the compound (II) to obtain the high-temperature sodium-ion battery electrolyte A.

Embodiment 2

[0038] Electrolyte B was prepared using the compound of formula (III).

[0039]

[0040]In a glove box with moisture less than 0.1ppm, oxygen less than 0.1ppm, and filled with argon, ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 3: 2: Mix evenly in a ratio of 5, add bisfluorosulfonimide sodium salt (NaFSI), the concentration of sodium salt is 1 mol L -1 , add auxiliary additives ethylene carbonate (VC), 1,3-(1-propene) sultone (PST) and N,N dicyclohexyl Carbodiimide (DCC), and then add 10 wt% of compound (III) to obtain high-temperature sodium-ion battery electrolyte B.

Embodiment 3

[0042] Electrolyte C is prepared by using the compound of formula (IV).

[0043]

[0044] In a glove box with moisture less than 0.1ppm, oxygen less than 0.1ppm, and filled with argon, ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 3: 2: Mix evenly in a ratio of 5, add bisfluorosulfonimide sodium salt (NaFSI), the concentration of sodium salt is 1 mol L -1 , respectively add auxiliary additives ethylene carbonate (VC), 1,3-(1-propene) sultone (PST) and succinic anhydride (SA) according to 1%, 1% and 1% of the total mass fraction of the electrolyte, Then add 5wt% of the compound (III) to obtain the high temperature sodium ion battery electrolyte C.

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Abstract

The invention relates to a high-temperature sodium ion battery electrolyte, a functional additive and a sodium ion battery. The high-temperature sodium-ion battery electrolyte comprises a bis (trifluoromethyl) functional additive and sodium salt, the bis (trifluoromethyl) functional additive is a functional additive containing a bis (trifluoromethyl) compound, the chemical formula of the bis (trifluoromethyl) compound is shown in the specification, and R1, R2, R3, R4, R5 and R6 are respectively selected from any one of alkane, alkoxy, aryl or heteroaryl; the double trifluoromethyl functional additive and Na < + > in the high-temperature sodium-ion battery electrolyte form an F-containing interfacial film on the surfaces of the positive electrode and the negative electrode of the sodium-ion battery; wherein the range of the high temperature is not lower than 40 DEG C. The electrolyte forms interface films on the surfaces of the positive electrode and the negative electrode, so that the dissolution of organic components in the interface films at high temperature can be effectively improved, the continuous decomposition of the electrolyte on the interface is reduced, and the high-temperature cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a high-temperature sodium-ion battery electrolyte, functional additives and a sodium-ion battery. Background technique [0002] With the rapid development of the new energy industry, the demand for 3C, small power and other fields has also increased in recent years. The overall demand for upstream resources in the lithium battery industry has also increased day by day, forming a resource run situation to a certain extent. Lithium carbonate, cobalt sulfate The price of various raw materials such as lithium ions has risen sharply, and the crustal abundance of lithium ions is only 0.0065%. Among them, the amount of resources that can be economically exploited is even more limited, and the quality varies greatly. At the same time, there are serious uneven distribution characteristics. High-quality resources Most of them are concentrated in South America, Australia and other places, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/054H01M10/42
CPCH01M10/0567H01M10/054H01M10/4235H01M2300/0025
Inventor 黄建李立飞
Owner 江苏蓝固新能源科技有限公司
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