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Lithium secondary battery electrolyte solution and lithium secondary battery containing lithium secondary battery electrolyte solution

A lithium secondary battery, electrolyte technology, applied in secondary batteries, electrolytes, organic electrolytes, etc., can solve problems such as improvement and no disclosure of high temperature performance

Inactive Publication Date: 2018-09-14
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But do not disclose the embodiment that improves high temperature performance

Method used

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  • Lithium secondary battery electrolyte solution and lithium secondary battery containing lithium secondary battery electrolyte solution

Examples

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Effect test

Embodiment 1

[0022] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, 1-ethyl-3-methylimidazolium tetrafluoroborate and additives. Described organic solvent accounts for 80.0% of the total mass of lithium secondary battery electrolyte, is made up of cyclic solvent (ethylene carbonate) and linear solvent (methyl ethyl carbonate), and the mass ratio of ethylene carbonate and methyl ethyl carbonate is 1 :1. The conductive lithium salt is lithium hexafluorophosphate, which accounts for 18.0% of the total mass of the electrolyte solution of the lithium secondary battery. 0.5% of the total mass of 1-ethyl-3-methylimidazolium tetrafluoroborate. The additives are lithium difluorophosphate and 2-propynyl methyl carbonate, respectively accounting for 1.0% and 0.5% of the total mass of the electrolyte. The electrolyte solution of this embodiment is used for LiNi 0.8 co 0.1 mn 0.1 o 2 / Graphite pouch battery....

Embodiment 2

[0024] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, dipyrrolidinyl ammonium tetrafluoroborate and additives. Described organic solvent accounts for 79.5% of the total mass of lithium secondary battery electrolyte, is made up of cyclic solvent (ethylene carbonate) and linear solvent (dimethyl carbonate), and the mass ratio of ethylene carbonate and dimethyl carbonate is 1 :2. The conductive lithium salt is lithium hexafluorophosphate, which accounts for 15.0% of the total mass of the electrolyte solution of the lithium secondary battery. The dipyrrolidinyl ammonium tetrafluoroborate accounts for 3.0% of the total mass of the electrolytic solution, and the additive is allyl methyl carbonate, which accounts for 2.5% of the total mass of the electrolytic solution. The electrolyte solution of this embodiment is used for LiNi 0.8 co 0.1 mn 0.1 o 2 / Silicon carbon pouch battery.

Embodiment 3

[0026] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, dipyrrolidinyl ammonium tetrafluoroborate and additives. Described organic solvent accounts for 77.0% of the total mass of lithium secondary battery electrolyte, is made up of cyclic solvent (ethylene carbonate) and linear solvent (diethyl carbonate), and the mass ratio of ethylene carbonate and diethyl carbonate is 1 :3. The conductive lithium salt is lithium hexafluorophosphate, which accounts for 12.0% of the total mass of the electrolyte solution of the lithium secondary battery. The dipyrrolidinyl ammonium tetrafluoroborate accounts for 10.0% of the total mass of the electrolytic solution, and the additive is lithium difluorophosphate, which accounts for 1.0% of the total mass of the electrolytic solution. The electrolyte solution of this embodiment is used for LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite pouch battery.

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Abstract

The invention relates to a lithium secondary battery electrolyte solution and a lithium secondary battery containing the lithium secondary battery electrolyte solution. The lithium secondary battery electrolyte solution is prepared from organic solvent, conductive lithium salt, ionic liquid and additives; the ionic liquid is selected from at least one of 1-ethyl-3-methyl imidazolium tetrafluoroborate and 2-pyrrolidyl ammonium tetrafluoroborate. According to the electrolyte solution, by adding the ionic liquid including the 1-ethyl-3-methyl imidazolium tetrafluoroborate and the 2-pyrrolidyl ammonium tetrafluoroborate and the additives including lithium difluorophosphate, 2-propinyl methyl carbonate, allyl methyl carbonate and 1,3-propane sultone in a combined mode, the high temperature cycle performance, the normal temperature cycle performance and the low temperature cycle performance of the electrolyte solution can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a lithium secondary battery electrolyte containing ionic liquid and a lithium secondary battery containing the electrolyte. Background technique [0002] In order to improve the high-temperature performance of lithium-ion batteries, solvents with higher boiling points such as diethyl carbonate and ethyl methyl carbonate are generally selected as the main solvents of the electrolyte, but these solvents have relatively high melting points, and the conductivity of the electrolyte at low temperatures The rate drops very quickly and the battery impedance increases rapidly. It is difficult to satisfy the low-temperature discharge performance of the battery. In order to improve the low-temperature performance of the battery, carboxylic acid esters with low melting points such as ethyl acetate and ethyl propionate are generally selected as the main solvent of the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0037H01M2300/0045Y02E60/10H01M2300/0025
Inventor 范伟贞余乐范超君赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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