Multifunctional high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery

A lithium-ion battery, high-voltage technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as transition metal oxides easily reduced and dissolved, negative electrode impedance increases, and battery performance deteriorates. , to achieve the effect of improving battery cycle performance and low temperature performance, and improving high temperature performance

Inactive Publication Date: 2020-03-17
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, at high temperature, the LiPF in the electrolyte 6 It is extremely easy to decompose and produce HF to corrode the positive electrode active material, resulting in the dissolution of metal ions; on the other hand, under high voltage, the transition metal oxide of the positive electrode act

Method used

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  • Multifunctional high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery
  • Multifunctional high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery
  • Multifunctional high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery

Examples

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Embodiment 1

[0051] The difference from Comparative Example 1 is that in this example, 1 wt% of compound a was added to the electrolyte solution.

[0052] The rest are the same as Comparative Example 1, and will not be repeated here.

Embodiment 2

[0054] The difference from Comparative Example 1 is that in this example, 1 wt% of compound b was added to the electrolyte solution.

[0055] The rest are the same as Comparative Example 1, and will not be repeated here.

Embodiment 3

[0057] The difference from Comparative Example 1 is that in this example, 1 wt% of compound c was added to the electrolyte solution.

[0058] The rest are the same as Comparative Example 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries. The multifunctional high-voltage lithium ion battery electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive comprises a difluorophosphoryl boron-accommodating compound, three substituent groups of the difluorophosphoryl boron-accommodating compound are respectively difluorophosphoryl-PO2F2 or-F, and at least one of the substituent groups is difluorophosphoryl. Compared with the prior art, the electrolyte disclosed by the invention not only can improve the high-temperature performance of the lithium ion battery under high voltage, but also greatly improves the cycle performance and the low-temperature performance of the battery. Meanwhile, the special additive also has a certaineffect of removing water and acid. In addition, the invention also provides a high-voltage lithium ion battery using the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a multifunctional high-voltage lithium-ion battery electrolyte and a high-voltage lithium-ion battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution. An ideal power source for power tools. In the technical field, increasing the working voltage or platform voltage of lithium-ion secondary batteries can effectively increase the energy density of lithium-ion batteries. [0003] At present, the charging cut-off voltage of lithium cobalt oxide battery is increased from 4.4V to 4.5V, and its effective capacity can be increased from 175mAh / g to about 220mAh / g. But at the same time, the performance of the battery is significantly reduced, especially the high-temperature cycle and ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 刘文博朱坤庆计阳夏小勇
Owner 东莞维科电池有限公司
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