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Low-temperature electrolyte and lithium ion battery thereof

An electrolyte and low-temperature technology, which is applied in the field of lithium-ion batteries, can solve the problems of low conductivity of lithium salts, and achieve the effects of improving ion conductivity, reducing internal resistance, and reducing loss

Pending Publication Date: 2021-08-31
广州明美新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the battery performance has been improved under general low-temperature environmental conditions, the problem of low conductivity of lithium salts still cannot be solved under ultra-low temperature conditions of -45°C. It is of great significance to improve the application value under extreme conditions

Method used

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  • Low-temperature electrolyte and lithium ion battery thereof
  • Low-temperature electrolyte and lithium ion battery thereof
  • Low-temperature electrolyte and lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Positive electrode preparation: modifying the positive electrode active material LiCoO 2 , Conductive carbon black and polytetrafluoroethylene are mixed evenly according to the mass ratio of 96.8:2.0:1.2, and then dispersed in N-methyl-2-pyrrolidone to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, After rolling, cutting and tab welding, the positive electrode sheet is obtained, and finally it is baked and vacuum-dried before use.

[0064] Negative electrode preparation: Mix the artificial graphite material, acetylene black and styrene-butadiene rubber evenly according to the mass ratio of 96:2:2, and then disperse them in deionized water to obtain the negative electrode slurry; spread the negative electrode slurry evenly on both sides of the copper foil , after rolling, cutting and tab welding, the negative electrode sheet is obtained, and finally it is baked and vacuum dried before use.

[0065...

Embodiment 2

[0071] Different from Example 1 is the preparation of electrolyte:

[0072] 1) In a nitrogen-filled glove box (O 2 2 (0<3ppm), prepare an organic solvent, the organic solvent is composed of the following components in mass percentage: 0.5% vinylene carbonate, 1% ethyl methyl carbonate, and the balance is ethylene carbonate with a mass ratio of 1:1:1 , a mixture of diethyl carbonate and propylene carbonate;

[0073] 2) Slowly add sulfur-containing oxygen-containing fluoroalkyl phosphate lithium into the organic solvent to form a lithium salt solution with a concentration of 1.2mol / L;

[0074] 3) Add 2% 1,3-propane sultone, 1.5% hexanetrinitrile, 1.5% lithium bistetrafluorophosphorimide and 1% triethylene to the lithium salt solution Diamine (c), after mixing evenly, is the electrolyte.

[0075] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0077] Different from Example 1 is the preparation of electrolyte:

[0078] 1) In a nitrogen-filled glove box (O 2 2 (0<3ppm), prepare an organic solvent, the organic solvent is composed of the following components in mass percentage: 0.5% vinylene carbonate, 1% ethyl methyl carbonate, and the balance is ethylene carbonate with a mass ratio of 1:1:1 , a mixture of diethyl carbonate and propylene carbonate;

[0079] 2) Slowly add sulfur-containing oxygen-containing fluoroalkyl phosphate lithium into the organic solvent to form a lithium salt solution with a concentration of 1.2mol / L;

[0080] 3) Add 2% 1,3-propane sultone, 1.5% hexanetrinitrile, 1.7% lithium bistetrafluorophosphorimide and 0.8% triethylene to the lithium salt solution Diamine (c), after mixing evenly, is the electrolyte.

[0081] 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 lithium ion batteries, and particularly relates to a low-temperature electrolyte. The electrolyte comprises a lithium salt, an organic solvent and an additive, the lithium salt is sulfur-containing oxygen-containing fluoroalkyl lithium phosphate, and the additive comprises a conventional additive, an acid-binding agent and bis-tetrafluorophosphorimide salt. In addition, the invention also relates to a lithium ion battery which comprises the low-temperature electrolyte. The electrolyte provided by the invention has high ionic conductivity under the ultralow temperature condition of -45 DEG C, an excellent solid electrolyte interface film can be formed on the surface of a pole piece, and the battery provided by the invention has good low-temperature discharge performance and long cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a low-temperature electrolyte and a lithium ion battery thereof. Background technique [0002] Due to its high operating voltage, high specific energy density, long cycle life, and environmental friendliness, lithium-ion batteries have become one of the indispensable and important chemical energy sources in the fields of electronic digital, electric vehicles, energy storage applications, aerospace and other fields. With the increasing application range of lithium-ion batteries, people have higher requirements for the charging and discharging performance of lithium-ion batteries in low temperature environments. [0003] At low temperatures, the decrease in the transport rate of lithium ions is the main reason for the decrease in the charging and discharging efficiency of lithium-ion batteries. The properties of positive electrode materials, negative elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0525H01M2300/0025Y02E60/10
Inventor 梁昌明
Owner 广州明美新能源股份有限公司
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