Electrolyte for high-nickel lithium ion battery, preparation method of electrolyte and high-nickel lithium ion battery

A technology of lithium-ion batteries and ion batteries, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as low high-temperature cycle retention rate, low-voltage cycle performance, unfavorable electrolyte cost, etc., to achieve cycle Improved performance, improved capacity retention, and improved cycle stability

Pending Publication Date: 2022-08-02
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

The disadvantage of this technical solution is that the high-voltage cycle performance is low and there is still room for improvement. In addition, the price of lithium difluorooxalate borate and lithium difluorophosphate used in this technical solution is relatively high, which increases the cost of the electrolyte and is not conducive to large-scale industrializat

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  • Electrolyte for high-nickel lithium ion battery, preparation method of electrolyte and high-nickel lithium ion battery
  • Electrolyte for high-nickel lithium ion battery, preparation method of electrolyte and high-nickel lithium ion battery
  • Electrolyte for high-nickel lithium ion battery, preparation method of electrolyte and high-nickel lithium ion battery

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preparation example Construction

[0058] A preparation method of an electrolyte for a high-nickel lithium ion battery, comprising the following steps:

[0059] S1. In an argon-filled glove box (O 2 2 O<3ppm), ethylene carbonate (EC) and methyl ethyl carbonate (EMC) are mixed according to the mass ratio as EC:EMC=1:(1~1.5);

[0060] S2, then slowly add lithium hexafluorophosphate to the non-aqueous organic solvent mixed solution, and configure into a lithium salt solution with a concentration of 1-3.5mol / L;

[0061] S3. Add 0.5wt% to 10wt% based on the total weight of the electrolyte, one or two of unsaturated carbonate [vinylene carbonate (VC) or ethylene ethylene carbonate (VEC) are mixed, and when the two are mixed, the mass The ratio is 1:(1~1.5)], lithium salt [lithium dioxalate borate (LiBOB), lithium difluorooxalate borate (LiDFOB), lithium bistrifluoromethanesulfonimide (LiTFSI), bisfluorosulfonimide Lithium salt (LiFSI) one or more] and 2-methyl maleic anhydride (CA) phosphate compound, fully stirred...

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Abstract

The invention discloses an electrolyte for a high-nickel lithium ion battery, a preparation method of the electrolyte and the high-nickel lithium ion battery, the electrolyte comprises a non-aqueous organic solvent, a high-concentration lithium salt and an electrolyte additive, the electrolyte additive comprises unsaturated carbonate, a lithium salt and 2-methyl maleic anhydride, the content of the unsaturated carbonic ester, the lithium salt and the 2-methyl maleic anhydride is 0.5 wt%-10 wt%. The electrolyte can effectively improve the high-temperature stability of the high-nickel lithium ion battery, and the thermal runaway heat of the battery solvent is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials for energy storage, and particularly relates to an electrolyte for high-nickel lithium-ion batteries, a preparation method thereof, and a high-nickel lithium-ion battery. Background technique [0002] At present, the most promising high-nickel lithium-ion battery is the 811 battery, but the characteristics of high-nickel and low-cobalt lithium-ion batteries also have certain shortcomings. While high nickel brings high energy density, it also brings new challenges to battery safety. , the hidden danger of safety accidents in the battery is higher than that of the low-nickel battery; and the reduction of the cobalt content reduces the number of charging cycles of the battery, and the service life of the battery is relatively lower. Therefore, the "811" battery needs to be optimized in terms of stability and durability. In addition, when the lithium-ion battery is used in a hig...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/4235H01M2300/0025Y02P70/50
Inventor 王淑娟杨博赵磊吴琼郗航程文姬牛凯刘增博康英李太江张瑞刚
Owner XIAN THERMAL POWER RES INST CO LTD
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