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Lithium-ion battery high-voltage electrolyte for lithium nickel manganese oxide positive electrode material

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, organic electrolytes, etc., can solve the problems of inability to match high-voltage cathode materials, battery performance degradation, side reactions, etc., and achieve good cycle performance and cycle performance. The effect of enhancing and suppressing polarization

Inactive Publication Date: 2020-08-14
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional electrolytes are prone to side reactions on the surface of positive electrode materials at high potentials, resulting in rapid degradation of battery performance and cannot match high-voltage positive electrode materials. Therefore, it is imperative to study high-voltage electrolytes

Method used

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  • Lithium-ion battery high-voltage electrolyte for lithium nickel manganese oxide positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0012] A lithium-ion battery high-voltage electrolyte for lithium nickel manganese oxide cathode materials, including organic solvents, electrolyte lithium salts, by adding 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl) The amine co-solvent is obtained by modifying the conventional electrolyte, and it is prepared according to the following steps:

[0013] a) The co-solvent is 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide and ethylene carbonate (EC), diethyl carbonate (DEC), ethyl methyl carbonate ( EMC) The organic solvent composed of EMC) is mixed evenly, and the proportion of 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide to the total mass is 5%, and the mass of EC:DEC:EMC The ratio is 5:2:3 to obtain a high-voltage electrolyte precursor.

[0014] b) Mix 1M lithium hexafluorophosphate with the electrolyte precursor solution evenly to obtain the target product.

[0015] Such as figure 1 As shown, the half-cell cycle diag...

Embodiment 2

[0018] A kind of lithium ion battery high-voltage electrolyte that is used for lithium nickel manganese oxide cathode material, similar to embodiment 1, is prepared according to the following steps:

[0019] a) Mix 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide with ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) Uniform, in which 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide accounts for 3% of the total mass, and the mass ratio of EC:DEC:EMC is 1:1:1 , to obtain a high-voltage electrolyte precursor.

[0020] b) Mix 1M lithium hexafluorophosphate with the electrolyte precursor solution evenly to obtain the target product.

Embodiment 3

[0022] A lithium ion battery high-voltage electrolyte for lithium nickel manganese oxide positive electrode material, similar to Example 1, prepared according to the following steps:

[0023] a) Mix 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide with ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) Uniform, wherein 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl)imide accounts for 1% of the total mass, and the mass ratio of EC:DEC:EMC is 5:3:3 , to obtain a high-voltage electrolyte precursor.

[0024] b) Mix 1M lithium hexafluorophosphate with the electrolyte precursor solution evenly to obtain the target product.

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Abstract

The invention discloses a lithium-ion battery high-voltage electrolyte for a lithium nickel manganese oxide positive electrode material. The electrolyte is obtained by adding a 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl) imide cosolvent to modify a conventional electrolyte. The electrolyte comprises the following components: an organic solvent, an electrolyte lithium salt and thecosolvent 1-tert-butyl-1-methylpiperidine bis(trifluoromethylsulfonyl) imide. A button cell assembled by adopting the high-voltage electrolyte has good cycle performance in a voltage range of 3V-5V. The electrolyte can form a stable solid electrolyte interface film on the surface of the lithium nickel manganese oxide positive electrode material in the charging and discharging process, so that thepolarization of an electrode and the decomposition of the electrolyte are inhibited, and the cycle performance of a battery is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery high-voltage electrolyte used for lithium nickel manganese oxide cathode materials. Background technique [0002] Electrolyte is an important part of lithium-ion batteries, and it is the carrier of ion movement during the charging and discharging process of the battery. With the development of various fields such as new energy vehicles, portable electronic products and large-scale energy storage, higher energy density requirements are put forward for lithium-ion batteries. Since the potential of lithiated negative electrode materials is close to that of lithium metal, increasing the voltage of lithium-ion batteries can effectively increase the energy density of the battery, but it also puts forward higher requirements for the electrolyte. Conventional electrolytes are prone to side reactions on the surface of positive electrode materials at high potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M4/505H01M4/525
CPCH01M10/0567H01M10/0525H01M4/505H01M4/525H01M2300/0025Y02E60/10
Inventor 崔大祥阳靖峰张芳卢玉英王亚坤焦靖华张放为
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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