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Non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of the battery not working properly and the cycle performance of the battery, so as to improve cycle performance and capacity retention rate, improve stability, and reduce the probability of oxidation reaction Effect

Active Publication Date: 2020-11-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome that the existing non-aqueous electrolyte system of lithium ion battery can only be used stably at a voltage not higher than 4.5V. When the working voltage is higher than 4.5V, the non-aqueous electrolyte system will be oxidized and decomposed. To solve the technical problem of causing the battery to fail to work normally and to reduce the cycle performance of the battery, a non-aqueous electrolyte is provided. The non-aqueous electrolyte has a significantly improved oxidation decomposition potential, even at a high voltage higher than 4.5V. Has good antioxidant properties

Method used

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  • Non-aqueous electrolyte and lithium-ion battery
  • Non-aqueous electrolyte and lithium-ion battery

Examples

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Embodiment 1

[0059] (1) Preparation of non-aqueous electrolyte

[0060] The boron-containing benzamide type additive that present embodiment adopts is:

[0061]

[0062] Lithium hexafluorophosphate (LiPF 6 ) was dissolved in ethylene carbonate (EC) and diethyl carbonate (DEC), then added boron-containing benzamide type additives, mixed uniformly, so as to obtain the non-aqueous electrolytic solution according to the present invention. Wherein, based on the total amount of the non-aqueous electrolyte, the content of lithium hexafluorophosphate is 12% by weight, and the content of the boron-containing benzamide type additive is 3% by weight, based on the total amount of ethylene carbonate and diethyl carbonate, The content of ethylene carbonate was 3% by weight.

[0063] (2) Preparation of lithium ion battery

[0064] In this example, a metal lithium sheet with a thickness of 600 μm was used as the negative electrode, and a polyethylene / polypropylene composite film with a thickness of ...

Embodiment 2

[0069] Adopt the method identical with embodiment 1 to prepare non-aqueous electrolytic solution and lithium ion battery, difference is, in step (1), the boron-containing benzamide type additive that adopts is:

[0070]

[0071] Based on the total amount of the non-aqueous electrolyte, the content of the boron-containing benzamide additive is 5% by weight.

Embodiment 3

[0073] Adopt the method identical with embodiment 1 to prepare non-aqueous electrolytic solution and lithium ion battery, difference is, in step (1), the boron-containing benzamide type additive that adopts is:

[0074]

[0075] Based on the total amount of the non-aqueous electrolyte, the content of the boron-containing benzamide additive is 7% by weight.

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Abstract

The invention discloses a nonaqueous electrolytic solution, the nonaqueous electrolytic solution contains lithium salt, an organic solvent, and a boron-containing benzamide type additive having a structure shown as a formula I. The invention also discloses a lithium ion battery employing the nonaqueous electrolytic solution. The nonaqueous electrolytic solution can obviously increase the oxidativedecomposition potential, and has good antioxidation performance under high voltage of being higher than 4.5 V(such as 4.95 V), so that the lithium ion battery employing the nonaqueous electrolytic solution can display good cycle life and capacity conservation rate under high voltage of being higher than 4.5 V.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries. Specifically, the present invention relates to a nonaqueous electrolytic solution, and the present invention also relates to a lithium ion battery using the nonaqueous electrolytic solution. Background technique [0002] Since its birth in the 1990s, lithium-ion batteries have developed rapidly. Generally, a lithium-ion battery includes an electrode group and a non-aqueous electrolyte, and the electrode group includes a positive electrode, a negative electrode, and a separator for separating the positive electrode and the negative electrode. When the battery is charged, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and vice versa during discharge. Lithium ion batteries have repeated migration of lithium ions during repeated charging and discharging, and non-aqueous electrolyte exists in lithium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 乔飞燕杨洋王圣
Owner BYD CO LTD
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