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New use of rubidium cesium compound, high-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery

A lithium-ion battery and compound technology, applied in the fields of high-voltage electrolyte additives, high-voltage electrolytes and lithium-ion batteries, can solve the problems of poor battery cycle performance, inability to cycle stably, poor rate performance, etc., to achieve large discharge capacity, increase The effect of good cycle life and rate performance

Inactive Publication Date: 2017-02-22
SHANGHAI RUGE TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the fact that the high-voltage positive electrode material cannot circulate stably due to the limitation of the electrochemical window of the electrolyte. reaction, or the defects of poor cycle performance and poor rate performance of the battery, a new application of rubidium and cesium compounds, a high-voltage electrolyte additive, a high-voltage electrolyte and a lithium-ion battery are provided

Method used

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  • New use of rubidium cesium compound, high-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery
  • New use of rubidium cesium compound, high-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery
  • New use of rubidium cesium compound, high-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Mix ethylene carbonate, diethyl carbonate, propylene carbonate and fluoroethylene carbonate evenly, add lithium hexafluorophosphate, and finally add cesium bis(trifluoromethylsulfonyl)imide and mix evenly to obtain a high-voltage electrolyte. Among them, the volume ratio of ethylene carbonate, diethyl carbonate, propylene carbonate and fluoroethylene carbonate is 2:4:3:1, the concentration of lithium hexafluorophosphate is 1mol / L, bis(trifluoromethylsulfonyl) The mass percentage of cesium amine is 0.85%, and the mass percentage is the percentage of the additive in the total mass of the electrolyte.

[0041] Use this electrolyte to assemble a lithium-ion battery, using lithium-rich ternary Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The material is the positive electrode, the lithium sheet is the negative electrode, and the Celgard diaphragm.

Embodiment 2

[0043] Mix ethylene carbonate, diethyl carbonate, propylene carbonate and fluoroethylene carbonate evenly, add lithium hexafluorophosphate, and finally add cesium hexafluorophosphate and mix evenly to obtain a high-voltage electrolyte. Among them, the volume ratio of ethylene carbonate, diethyl carbonate, propylene carbonate and fluoroethylene carbonate is 2:4:3:1, the concentration of lithium hexafluorophosphate is 0.8mol / L, and the mass percentage of cesium hexafluorophosphate is 0.6%, and the mass percentage is the percentage of the additive in the total mass of the electrolyte.

[0044] Use this electrolyte to assemble a lithium-ion battery, using lithium-rich ternary Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The material is the positive electrode, the lithium sheet is the negative electrode, and the Celgard diaphragm.

Embodiment 3

[0046] Mix ethylene carbonate, ethyl methyl carbonate, propylene carbonate and sulfolane evenly, add lithium hexafluorophosphate and lithium boron dioxalate, and finally add cesium bis(trifluoromethylsulfonyl)imide and mix evenly to obtain a high-voltage electrolyte. Wherein, the volume ratio of ethylene carbonate / ethyl methyl carbonate / propylene carbonate / sulfolane is 2:3:3:2, the concentration of lithium hexafluorophosphate is 0.9mol / L, the concentration of lithium boron dioxalate is 0.1mol / L, two The mass percentage of cesium (trifluoromethylsulfonyl)imide is 5%, and the mass percentage is the percentage of the additive in the total mass of the electrolyte.

[0047] Use this electrolyte to assemble a lithium-ion battery, using lithium-rich ternary Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The material is the positive electrode, the lithium sheet is the negative electrode, and the Celgard diaphragm.

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Abstract

The invention discloses a new use of a rubidium cesium compound in the field of lithium ion batteries as an additive in a high-voltage electrolyte, a high-voltage electrolyte additive, the high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte consists of an electrolyte lithium salt, an organic solvent and 0.05%-5% of rubidium cesium compound. The rubidium cesium compound as the high-voltage electrolyte additive for the lithium ion battery can protect an anode material, effectively reduces oxidative decomposition of the electrolyte on the anode surface, greatly upgrades the cycling stability of a battery, increases the battery life, and promotes truly commercial application of the high-voltage anode material. The high-voltage electrolyte using the rubidium cesium compound or the high-voltage electrolyte additive can effectively improve the discharge capacity of the high-voltage anode material under high current density, prolongs the cycling life of the high-voltage anode material battery, and simultaneously upgrades the power characteristic of the battery under high current density.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a new application of a rubidium-cesium compound, a high-voltage electrolyte additive, a high-voltage electrolyte and a lithium-ion battery. Background technique [0002] With the growing market of new energy electric vehicles, lithium-ion batteries, as the main source of power, are facing challenges: improving the energy density of batteries and increasing the cruising range of electric vehicles. [0003] Improving the working voltage of the battery and the specific capacity of the positive and negative electrode materials is an effective way to increase the energy density of lithium-ion batteries. Currently limited by the electrochemical window of the commercial electrolyte, the potential of the commercial positive electrode materials used is below 4.3V, such as lithium iron phosphate (LiFePO 4 ), lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) Ternary m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 车海英张维民何雨石汪小平许理明马紫峰
Owner SHANGHAI RUGE TECH DEV CO LTD
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