Non-aqueous electrolytic solution and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, which is applied in the manufacture of non-aqueous electrolyte batteries, non-aqueous electrolytes, and electrolyte batteries, and can solve problems such as battery expansion and insufficient high-temperature cycle performance

Inactive Publication Date: 2021-01-26
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of insufficient high-temperature cycle performance and battery expansion in

Method used

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  • Non-aqueous electrolytic solution and lithium ion battery
  • Non-aqueous electrolytic solution and lithium ion battery
  • Non-aqueous electrolytic solution and lithium ion battery

Examples

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Embodiment 1

[0086] This embodiment is used to illustrate the non-aqueous electrolyte, lithium-ion battery and preparation method thereof disclosed in the present invention, including the following steps:

[0087] (1) Preparation of non-aqueous electrolyte:

[0088] In a glove box with water and oxygen content less than 10ppm, mix ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) according to the mass ratio = 3:5:2. Lithium hexafluorophosphate (LiPF 6 ) concentration is 1mol / L. Then add 0.5% of compound 1 by mass, 1% of compound 4 by mass, and 1% of compound 10 by mass, and mix to obtain a non-aqueous electrolyte.

[0089] (2) Preparation of lithium ion battery:

[0090] The above-mentioned prepared non-aqueous electrolyte is injected into a lithium-ion battery cell with a standard capacity of 1500mAh, wherein the positive electrode active material of the lithium-ion battery cell is selected from LiNi x co y mn z o 2 , where x=0.8; y=0.1; z=0.1 The n...

Embodiment 2～21

[0092] This embodiment is used to illustrate the non-aqueous electrolyte, lithium-ion battery and preparation method thereof disclosed by the present invention, including most of the operating steps in Example 1, the difference being:

[0093] In the preparation step of described non-aqueous electrolytic solution:

[0094] The non-aqueous electrolytic solution is added with the components shown in Example 2-Example 21 in Table 1.

[0095] In the preparation step of described lithium ion battery:

[0096] The upper limit voltage shown in Example 2-Example 21 in Table 1 was used for charge-discharge formation, and the negative electrode material layer with the compacted density shown in Example 2-Example 21 in Table 1 was used.

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Abstract

In order to overcome the problems of insufficient high-temperature cycle performance and battery expansion of an existing lithium ion battery, the invention provides a non-aqueous electrolytic solution, which comprises a solvent, an electrolyte salt and an additive, wherein the additive comprises unsaturated phosphate shown in a structural formula 1, bicyclic carbonate shown in a structural formula 2 and cyclic sulfate shown in a structural formula 3. The invention also discloses a lithium ion battery comprising the non-aqueous electrolytic solution. When the non-aqueous electrolytic solutionprovided by the invention is applied to the lithium ion battery, the non-aqueous electrolytic solution has relatively good long-term high-temperature cycle performance and long-term high-temperature storage performance and relatively low volume expansion rate, and the electrolytic solution has relatively good stability in long-term circulation.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a nonaqueous electrolytic solution and a lithium ion battery. Background technique [0002] Due to its irreplaceable advantages such as low self-discharge rate, long cycle life, high working voltage, and low pollution, lithium-ion batteries have been widely used in daily life as power sources. Whether it is in mobile communications, notebook computers, or new energy vehicles, it has broad prospects. At the same time, users have also put forward requirements for lithium-ion batteries such as high energy density and fast charging. In the lithium-ion battery system, continuously increasing the battery operating voltage and operating temperature will lead to different degrees of electrolyte decomposition, thereby accelerating the deterioration and failure of battery performance. [0003] During the first charge and discharge process of the electrolyte, the e...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235H01M2300/0025H01M2004/027H01M2004/021H01M2220/20H01M2220/30Y02P70/50
Inventor 钱韫娴胡时光荆水邓永红
Owner SHENZHEN CAPCHEM TECH
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