High-voltage lithium-ion battery electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the field of high-voltage lithium-ion battery electrolyte, can solve problems such as film thickness, poor low-temperature discharge performance, and large irreversible capacity, and achieve improved cycle performance, wettability, and high battery capacity. The effect of chemical reactivity

Inactive Publication Date: 2015-03-25
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Abstract
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Problems solved by technology

For example, Chinese patent CN103456993A discloses a high-voltage lithium-ion battery electrolyte. In its technical solution, additives such as fluorophosphazene, fluoroether and unsaturated olefin sultone are used to improve the cycle performance of the battery under high voltage. 1,3-propene sultone and / or 1,4-butene sultone are selected as unsaturated olefin sultone, however, the film is thicker, the first cycle irreversible capacity is larger, and it has low-temperature discharge performance Insufficient

Method used

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  • High-voltage lithium-ion battery electrolyte
  • High-voltage lithium-ion battery electrolyte
  • High-voltage lithium-ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0053] In a glove box filled with argon (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, the amount added accounts for 0.5%, 5.0%, 1.0%, and 5.0% of the total mass of the electrolyte respectively; finally, lithium hexafluorophosphate accounting for 12.5% ​​of the total mass of the electrolyte is slowly added to the mixed solution, and the lithium ion of Example 1 is obtained after stirring evenly. battery electrolyte.

Embodiment 2

[0055] In a glove box filled with argon (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, the amount added accounts for 1.0%, 5.0%, 1.5%, and 7.0% of the total mass of the electrolyte; finally, lithium hexafluorophosphate, which accounts for 13.0% of the total mass of the electrolyte, is slowly added to the mixed solution, and the lithium ion of Example 2 is obtained after stirring evenly. battery electrolyte.

Embodiment 3

[0057] In a glove box filled with argon (moisture 2 HCF 2 OCH 2 CF 3 , the added amount accounts for 1.5%, 5.5%, 2.0%, and 5.0% of the total mass of the electrolyte; finally, slowly add 1.0% of the total mass of the electrolyte to the mixed solution of lithium difluorooxalate borate and 12% of lithium hexafluorophosphate, and stir evenly Obtain the lithium ion battery electrolyte of embodiment 3 afterward.

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Abstract

The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a high-voltage lithium-ion battery electrolyte. The high-voltage lithium-ion battery electrolyte comprises non-aqueous solvent, lithium salt and an additive. The additive comprises the mixture of phosphonitrile, annular sulphate and hydrogen fluoroether. The high-voltage lithium-ion battery electrolyte can form a film on the surface of an electrode through the synergistic effect of the phosphonitrile, the annular sulphate and the hydrogen fluoroether, oxygenolysis of the electrolyte is restrained, and the cycle performance of 4.5 V and 5.0 V high-voltage lithium-ion batteries is obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolyte, in particular to a high-voltage lithium-ion battery electrolyte. Background technique [0002] As consumers have higher and higher requirements for terminal equipment such as smartphones, power tools and electric vehicles, it is imminent to increase the energy density of lithium-ion batteries. The development of new lithium battery materials is the most effective way to increase the energy density of lithium-ion batteries. [0003] At present, the commonly used cathode material LiCoO 2 、LiNi x mn y co 1-x-y o 2 The charging cut-off voltage of the battery is 4.2V, and the working voltage of the battery is 3.6~3.7V. By developing 4.5V coated LiCoO 2 Or new material LiNi 0.5 mn 1.5 o 4 , can effectively increase the output voltage and discharge capacity of the battery, and increase the energy density of the lithium-ion battery. [0004] However, as the potential of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 吕家斌郭明黄慧聪
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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