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High-nickel ternary system lithium ion power battery electrolyte solution

A ternary system and power battery technology, applied to secondary batteries, circuits, electrical components, etc., can solve the problems of fast battery capacity decay and short service life

Inactive Publication Date: 2018-09-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The Chinese patent application with the application number CN201310679971.9 provides a lithium battery electrolyte additive and its electrolyte in order to overcome the shortcomings of the prior art that lithium batteries have fast battery capacity decay and short service life in common electrolytes. It is made by mixing 1,4 butane sultone or 1,3-propane sultone and ethanolamine. The electrolyte containing the additive consists of lithium salt 11%~15%, organic solvent 82%~88%, additive 0.5%~4% composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 800g propylene carbonate organic solvent, 100g electrolyte lithium salt LiAl(OCH(CF 3 ) 2 ) 4 and 50gLi(OCH(CF 3 ) 2 ), 5g O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive and 10g [2.2.2]-cryptate and potassium monohexadecyl phosphate, 35g diethylene acetal Glycoloxycyclotetraphosphazene flame retardant additive; O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive with [2.2.2]-cryptate and monohexadecyl Potassium phosphate and propylene carbonate organic solvent are mixed and stirred, and large particles are filtered to obtain solution A; the [2.2.2]-cryptand and potassium monohexadecyl phosphate are mixed in a mass ratio of 1:1;

[0036] (2) Combine solution A obtained in step (1) with LiAl(OCH(CF 3 ) 2 ) 4 and Li(OCH(CF 3 ) 2 ) the electrolyte lithium salt and the diethylene glycol oxycyclotetraphosphazene flame retardant additive are mixed and stirred to obtain the electrolytic solution.

Embodiment 2

[0038] (1) Weigh 960g propylene carbonate organic solvent, 10g electrolyte lithium salt LiAl(OCH(CF 3 ) 2 ) 4 and 10gLi(OCH(CF 3 ) 2 ), 5g O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive and 5g [2.2.2]-cryptate and potassium monohexadecyl phosphate, 10g diethylene diacetate Alcoholoxycyclotetraphosphazene flame retardant additive; O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive with [2.2.2]-cryptate and monohexadecyl phosphoric acid Potassium ester and propylene carbonate organic solvent are mixed and stirred, and large particles are filtered to obtain solution A; the [2.2.2]-cryptand and potassium monohexadecyl phosphate are mixed in a mass ratio of 1:1;

[0039] (2) Mix solution A obtained in step (1) with LiAl(OCH(CF 3 ) 2 ) 4 and Li(OCH(CF 3 ) 2 ) the electrolyte lithium salt and the diethylene glycol oxycyclotetraphosphazene flame retardant additive are mixed and stirred to obtain the electrolytic solution.

Embodiment 3

[0041] (1) Weigh 900g propylene carbonate organic solvent, 25g electrolyte lithium salt LiAl(OCH(CF 3 ) 2 ) 4 and 20gLi(OCH(CF 3 ) 2 ), 10g O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive and 5g [2.2.2]-cryptate and potassium monohexadecyl phosphate, 35g diethylene diacetate Alcoholoxycyclotetraphosphazene flame retardant additive; O-succinimide-1,3-dimethylpropylurea hexafluorophosphate additive with [2.2.2]-cryptate and monohexadecyl phosphoric acid Potassium ester and propylene carbonate organic solvent are mixed and stirred, and large particles are filtered to obtain solution A; the [2.2.2]-cryptand and potassium monohexadecyl phosphate are mixed in a mass ratio of 1:1;

[0042] (2) Mix solution A obtained in step (1) with LiAl(OCH(CF 3 ) 2 ) 4 and Li(OCH(CF 3 ) 2 ) the electrolyte lithium salt and the diethylene glycol oxycyclotetraphosphazene flame retardant additive are mixed and stirred to obtain the electrolytic solution.

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Abstract

The invention relates to the technical field of lithium battery ternary electrode material system electrolyte solution, and in particular, relates to a high-nickel ternary system lithium ion power battery electrolyte solution. The high-nickel ternary system lithium ion power battery electrolyte solution comprises an organic solvent, an electrolyte lithium salt, a functional additive and a flame retardant additive; the functional additive is at least one of O-succinimide-1,3-dimethylpropylurea hexafluorophosphate or [2.2.2]-cryptand and potassium monohexadecyl phosphate; the flame retardant additive is diglycol oxycyclophosphamide; with the total mass of the electrolyte solution as the standard, the addition amount of the functional additive is 0.5-1.5%, and the addition amount of the flameretardant additive is 1-3.5%. The high-nickel ternary system lithium ion power battery electrolyte solution has the advantages of high electrical conductivity and good battery cycling performance.

Description

technical field [0001] The invention relates to the technical field of electrolytes of lithium battery ternary electrode material systems, in particular to a high-nickel ternary system lithium-ion power battery electrolyte and a preparation method thereof. Background technique [0002] Ternary materials (nickel cobalt lithium manganese oxide) increasing the nickel content can greatly increase the specific capacity of the material, so high nickel ternary materials must be an ideal material for large batteries in the future. [0003] However, with the development of ternary materials in the direction of high nickel, the water absorption of the material is enhanced and the stability is also reduced. Especially under high temperature conditions, the catalytic effect of nickel will accelerate the decomposition of conventional electrolytes, resulting in the degradation of the entire battery system. Performance degradation, especially rapid capacity decay. In order to reduce the r...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 陈庆赵海林
Owner CHENDU NEW KELI CHEM SCI CO LTD
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