High-temperature and high-safety non-water electrolyte

A non-aqueous electrolyte, high-temperature technology, applied in non-aqueous electrolytes, organic electrolytes, circuits, etc., can solve the problems that the high-temperature cycle performance and safety performance of batteries have not been researched, so as to improve cycle life and safety performance, improve Thermal stability, effect of reducing thermal decomposition ability

Inactive Publication Date: 2016-10-12
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrolyte prepared by this invention has significantly improved the high-temperature storage performance of the battery cell, but no relevant research

Method used

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Embodiment 1

[0023] Embodiment 1, this embodiment provides a high temperature and high safety non-aqueous electrolyte, each component and its content are as follows: Lithium salt is LiPF 6 , the concentration in the electrolyte is 1.0mol / L, the solvent is EC:DEC:EMC=1:1:1 (volume ratio), the additive is VC, which accounts for 1% of the total mass of the electrolyte, and triisopropyl borate accounts for 1% of the total mass of the electrolyte. 1% of the total mass of the electrolyte, and methyl fluorosulfonyl difluoroacetate accounts for 1% of the total mass of the electrolyte.

Embodiment 2

[0024] Embodiment 2, this embodiment provides a high temperature and high safety non-aqueous electrolyte, each component and its content are as follows: Lithium salt is LiPF 6 , the concentration in the electrolyte is 1.0mol / L, the solvent is EC:DEC:EMC=1:1:1 (volume ratio), the additive is VC, which accounts for 1% of the total mass of the electrolyte, and triisopropyl borate accounts for 1% of the total mass of the electrolyte. 1% of the total mass of the electrolyte, and methyl fluorosulfonyl difluoroacetate accounts for 3% of the total mass of the electrolyte.

Embodiment 3

[0025] Embodiment 3, this embodiment provides a high temperature and high safety non-aqueous electrolyte, each component and its content are as follows: Lithium salt is LiPF 6 , the concentration in the electrolyte is 1.0mol / L, the solvent is EC:DEC:EMC=1:1:1 (volume ratio), the additive is VC, which accounts for 1% of the total mass of the electrolyte, and triisopropyl borate accounts for 1% of the total mass of the electrolyte. 1% of the total mass of the electrolyte, and methyl fluorosulfonyl difluoroacetate accounts for 5% of the total mass of the electrolyte.

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Abstract

The invention relates to the field of chemical engineering and relates to a high-temperature and high-safety non-water electrolyte for a lithium ion battery. The high-temperature and high-safety non-water electrolyte is prepared from substances in parts by weight as follows: an organic solvent, lithium salt, a high-temperature additive and an additive, wherein the organic solvent adopts high-purity carbonic ester type organic solvents; the lithium salt is one or a mixture of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(oxalate) borate, lithium bis(trifluoromethanesulfonyl)imide, lithium difluoro(oxalato) borate, lithium bis(fluorosulfonyl)imide and the like; the high-temperature additive is triisopropyl borate; the additive is at least one of vinylene carbonate, methylene methanedisulfonate, 1,3-(1-propene) sultone, 1,3-propane sultone, cyclohexylbenzene, methyl 2,2-difluoro-2-(fluorosulfonyl)acetate and the like. At the high temperature, the high-temperature additive, namely, triisopropyl borate, lacks an electron structure and easily interacts with PF6<->, the thermal decomposition capability of LiPF6 is reduced, the thermal stability of the electrolyte is improved, the cycle life of the battery is further prolonged, the safety performance of the battery is further improved, and the high-temperature use demands of the battery cell can be met.

Description

technical field [0001] The invention relates to the field of chemical industry and to the field of battery electrolyte, in particular to a high-temperature and high-safety non-aqueous electrolyte for lithium-ion batteries. Background technique [0002] Due to its high voltage, high power, high specific energy, long life, low self-discharge, no memory effect, and environmental friendliness, lithium-ion batteries have attracted widespread attention from governments and researchers. However, the applicable temperature of lithium-ion batteries The range is narrow. Generally, when the temperature is higher than 60°C, the lithium hexafluorophosphate system electrolyte will decompose, causing the battery cell to expand, causing the battery capacity to decay rapidly, and may even cause combustion or explosion, which seriously limits its wide application. When a lithium-ion battery is used as a power source in an extreme high-temperature environment, the local or overall temperature ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 任加兴刘子磊赵志华任海刘永
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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