High-nickel ternary cathode material system battery electrolyte and lithium-ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of high-nickel ternary positive electrode material system battery electrolyte and lithium-ion batteries, can solve the problems of high-temperature cycle and high-temperature storage performance, etc., to improve interface compatibility, improve Low temperature and impedance reduction effect, good thermal stability effect

Active Publication Date: 2020-02-11
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a new electrolytic solution for the high-nickel ternary positive electrode material system in the prior art, especially the high-nickel ternary positive electrode material / silicon-carbon negative electrode system lithium ion battery. Liquid and lithium-ion batteries, and hope to further improve the low-temperature discharge performance of lithium-ion batteries on this basis

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  • High-nickel ternary cathode material system battery electrolyte and lithium-ion battery

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preparation example Construction

[0042] According to some embodiments provided by the present invention, the preparation method of the high-nickel ternary positive electrode material system battery electrolyte includes the following steps:

[0043] S1: Add the electrolyte lithium salt into the solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;

[0044] S2: Add positive electrode film-forming additives, negative electrode film-forming additives and low-impedance additives to the lithium salt solution, and mix uniformly to obtain the high-nickel ternary positive electrode material system battery electrolyte.

[0045] Preferably, the solvent is purified. The purification refers to the removal of impurities and water from the solvent, preferably through molecular sieves and activated carbon. Described molecular sieve can adopt type, type or type.

[0046] According to some embodiments provided by the present invention, the dissolution temperature of the electrolyte ...

Embodiment 1

[0054] In this embodiment, the electrolyte provided includes a mixed organic solvent composed of ethyl methyl carbonate (EMC), ethylene carbonate (EC) and dimethyl carbonate (DMC), and the lithium salt is LiPF 6 , the positive electrode film-forming additive is triallylbenzenesulfonyl phosphoimidate, the negative electrode film-forming additive is fluoroethylene carbonate and the low impedance additive is lithium difluorophosphate.

[0055] The preparation method of described electrolytic solution is: in the glove box that moisture is less than 10ppm, oxygen content is less than 1ppm, solvent is according to ethyl methyl carbonate (EMC) 30%, ethylene carbonate (EC) 20%, dimethyl carbonate ( DMC) 50% mass fraction mixed evenly, at 10°C, add electrolyte lithium salt LiPF 6 Prepare a 1mol / L solution, stir and mix well, then add 1.0% triallylbenzenesulfonyl phosphoimidate (TABSP), 10% Fluoroethylene carbonate (FEC) and 1.0% lithium difluorophosphate (LiDFP) were stirred evenly to...

Embodiment 2

[0057] Different from Example 1, the sum of the mass of solvent and lithium salt is 100%, the addition of triallylbenzenesulfonyl phosphoimidate (TABSP) is 1.2%, fluoroethylene carbonate (FEC ) was added in an amount of 10% and lithium difluorophosphate (LiDFP) was added in an amount of 1.0%.

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Abstract

The invention provides an electrolyte for a high-nickel ternary cathode material system battery and a lithium ion battery. The electrolyte comprises a solvent, an electrolyte lithium salt and an additive. The additive comprises a cathode film forming additive triallyl phenylsulfonyl phosphorus imide, an anode film forming additive fluoroethylene carbonate and low-impedance additive lithium difluorophosphate. The electrolyte provided by the invention is applied to a lithium ion battery of a high-nickel cathode / silicon carbon anode system, the interface compatibility of the electrolyte and the anode and the cathode can be improved, and the high-temperature cycle performance, and the high-temperature storage performance and the low-temperature discharge performance of the lithium ion batteryare improved. The preparation method is simple, easy to industrialize and has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution for a high-nickel ternary positive electrode material system battery and a lithium-ion battery. Background technique [0002] Lithium-ion batteries with high energy density have received more and more attention. In order to improve the energy density of lithium-ion batteries, many efforts have been made on positive and negative electrode materials. On the positive electrode side, the nickel-rich ternary layered oxide {Li[NixCoyMz]O 2 (0<x, y, z<1; M=Mn, abbreviated as NMC; M=Al; abbreviated as NCA)} has excellent comprehensive properties such as high energy density, good cycle performance, and moderate price. It is the current lithium-ion battery (LIBs ) is the most promising type of cathode material. With the rapid development of electric vehicles (EVs) and hybrid electric vehicles (HEVs), the requirements for energy density, cycle l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 朱辉余意张新民何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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