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Ternary cathode material lithium ion battery electrolyte

A lithium-ion battery and cathode material technology, applied in the field of ternary cathode material lithium-ion battery electrolyte, can solve the problem that the specific surface area of ​​ternary materials affects battery performance, battery high and low temperature cycle performance, and high temperature storage performance cannot be satisfied, etc. problems, achieve good thermal stability, prevent direct contact reaction decomposition, and improve high-voltage cycle performance

Pending Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ternary power battery electrolyte of 4.35V and above on the market is still immature. The main problem is that the ternary material has a large specific surface area and the Ni element with stronger oxidizing ability in the system can chemically interact with the electrolyte, thereby Affect the performance of the battery, especially the high and low temperature cycle performance and high temperature storage performance of the battery cannot be satisfied

Method used

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  • Ternary cathode material lithium ion battery electrolyte
  • Ternary cathode material lithium ion battery electrolyte
  • Ternary cathode material lithium ion battery electrolyte

Examples

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Embodiment 1

[0032] A ternary cathode material lithium-ion battery electrolyte, its raw materials include by weight percentage: 2% fluoroethylene carbonate, 13.5% lithium hexafluorophosphate, 1% 1,3-propane sultone, 1% difluoro Lithium phosphate, 0.5% tris(trimethylsilyl) borate, and the balance is an organic solvent;

[0033] Wherein, the organic solvent is a mixed solvent in which the mass ratio of ethylene carbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate is 25:5:50:20.

[0034] The preparation method of the above-mentioned ternary positive electrode material lithium-ion battery electrolyte is as follows: in a glove box (moisture < 10ppm, oxygen content < 1ppm) filled with argon, take an organic solvent and mix well, then add fluoroethylene carbonate, 1, 3-propane sultone, lithium difluorophosphate, tris(trimethylsilyl) borate, and lithium hexafluorophosphate are added slowly, and stirred until they are completely dissolved.

Embodiment 2

[0047] Organic solvent is the mixed solvent that the mass ratio of ethylene carbonate, ethyl methyl carbonate, diethyl carbonate is 30:60:10, other is with embodiment 1.

Embodiment 3

[0049] Organic solvent is the mixed solvent that the mass ratio of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, ethyl propionate is 25:5:55:10:5, other is with embodiment 1.

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Abstract

The invention discloses a ternary cathode material lithium ion battery electrolyte which comprises the following raw materials: an organic solvent, a lithium salt, a film-forming additive and a functional additive, and the functional additive comprises a low-impedance lithium salt, a sulfonate organic matter and a borate compound. Through the synergistic effect generated by using the three additives of the low-impedance lithium salt, the sulfonate organic matter and the borate compound, the ternary positive electrode material battery has excellent discharge performance in a low-temperature environment, and when the working voltage is 4.4 V or above, the high-temperature cycle performance is excellent, so that the electrolyte has a wide application prospect in a ternary battery system.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a ternary cathode material lithium-ion battery electrolyte. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles and other fields due to their high working voltage, high energy density, long cycle life, and environmental friendliness. The application of lithium-ion batteries in new energy vehicles will show a trend of heavy growth in the next few years. According to the "Energy Saving and New Energy Vehicle Industry Development Plan", power batteries require an energy density of 300Wh / Kg by 2020. Therefore, it is imperative to develop battery systems with high energy density. [0003] At present, there are mainly two types of lithium-ion batteries used in the field of new energy vehicles, one is lithium iron phosphate (LFP) batteries as the positive electrode material, and the other is ternary mate...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0017Y02E60/10
Inventor 俞金萍梁大宇沈剑
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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