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

A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as unrecorded battery performance, and achieve the effect of improving normal temperature cycle performance

Active 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

[0005] However, the problem with the above solutions is that most of them have better capacity recovery rates at room temperature and high temperature, and the battery performance at low temperature is not recorded.

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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Embodiment 1

[0027] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, a bis(trifluoromethanesulfonyl)amine compound substituted by a phenyl group or a pyridyl group, and an additive. Described organic solvent accounts for 76.0% 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. N,N-bis(trifluoromethanesulfonyl)aniline accounts for 5.0% of the total mass of the electrolyte. The additive is lithium difluorodioxalate phosphate, accounting for 1.0% 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...

Embodiment 2

[0029] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, a bis(trifluoromethanesulfonyl)amine compound substituted by a phenyl group or a pyridyl group, and an additive. Described organic solvent accounts for 80.5% 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. N,N-bis(trifluoromethylsulfonyl)-2-pyridinamine accounts for 0.5% of the total mass of the electrolyte, and the additive is triallyl isocyanurate, 2-propynyl methyl carbonate, Accounting for 1.0% and 3.0% of the total mass of the electrolyte. The electrolyte solution of this embodiment is used fo...

Embodiment 3

[0031] In this embodiment, an electrolyte solution for a lithium secondary battery is composed of an organic solvent, a conductive lithium salt, a bis(trifluoromethanesulfonyl)amine compound substituted by a phenyl group or a pyridyl group, and an additive. Described organic solvent accounts for 85.0% 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. N,N-bis(trifluoromethanesulfonyl)aniline accounts for 1.0% of the total mass of the electrolyte, and the additives are lithium difluorodioxalate phosphate and triallyl isocyanurate, which respectively account for 1.0% of the total mass of the electrolyte. 1.0%, 1.0%. The electrolyte solution of thi...

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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, a double (triflyl) amine replaced by a phenyl group or a pyridyl group and an additive. According to the electrolyte solution, by adding the double (triflyl) amine replaced by the phenyl group or the pyridyl group and triallyl isocyanurate and 2-propinyl methyl carbonate in a combined mode, the normal temperature cycleperformance, the high temperature storage performance and the low temperature discharging 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 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 higher melting points, and the conductivity of the electrolyte at low temperatures The drop is very fast 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 lower melting points such as ethyl acetate and ethyl propionate are generally selected as the main solvent of the electrolyte, but the boiling point of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/4235Y02E60/10
Inventor 范伟贞余乐谢添赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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