Lithium-ion battery and its non-aqueous electrolyte

A non-aqueous electrolyte and lithium-ion battery technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion battery cycle capacity retention rate decline, irreversible capacity loss, and high positive oxidation activity. High-temperature storage performance and intermittent cycle capacity retention, reduced electrochemical activity, and the effect of inhibiting oxidative decomposition

Active Publication Date: 2020-03-24
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under high voltage, the oxidation activity of the positive electrode becomes higher, and the non-aqueous electrolyte is prone to electrochemical oxidation reaction on the surface of the positive electrode, and then decomposes to generate gas, causing irreversible capacity loss, resulting in a decrease in the cycle capacity retention rate of lithium-ion batteries.

Method used

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  • Lithium-ion battery and its non-aqueous electrolyte
  • Lithium-ion battery and its non-aqueous electrolyte
  • Lithium-ion battery and its non-aqueous electrolyte

Examples

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Effect test

Embodiment 1

[0047] Lithium-ion batteries were prepared according to the method of Comparative Example 1, the difference was only that: the non-aqueous electrolyte also contained additives, and the additive was LiBF with a mass percentage of 0.1% in the non-aqueous electrolyte 4 And the dinitrile compound with the structure of formula I in the mass percentage content of 1% in the non-aqueous electrolyte.

Embodiment 2

[0049] Lithium-ion batteries were prepared according to the method of Comparative Example 1, the difference was only that: the non-aqueous electrolyte also contained additives, and the additive was LiBF with a mass percentage of 0.2% in the non-aqueous electrolyte 4 And the dinitrile compound with the structure of formula I in the mass percentage content of 1% in the non-aqueous electrolyte.

Embodiment 3

[0051] Lithium-ion battery was prepared according to the method of comparative example 1, the difference was only: the non-aqueous electrolyte also contained additives, and the additive was LiBF with a mass percentage of 0.3% in the non-aqueous electrolyte 4 And the dinitrile compound with the structure of formula I in the mass percentage content of 1% in the non-aqueous electrolyte.

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Abstract

The invention discloses a non-aqueous electrolyte. The non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, and the additive comprises lithium tetrafluoroborate and at least one of unsaturated bond-containing dinitrile compounds of formula I and formula II. In the formula I and the formula II, R1, R2, A1 and A2 are independently selected from one or more of C0-C5 aliphatic alkyl groups; and R3, R4, A3 and A4 are independently selected from one or more of the hydrogen atom, the fluorine atom , the chlorine atom, an alkyl group and a phenyl group. Additionally, the invention also discloses a lithium ion battery containing the non-aqueous electrolyte.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, more specifically, the invention relates to a lithium ion battery and its non-aqueous electrolyte. Background technique [0002] Lithium-ion batteries have unique advantages such as high energy density, high working voltage, low self-discharge rate, long cycle life, and no pollution. They have been widely used as power sources in electronic products such as cameras and mobile phones. [0003] In recent years, the rapid development of smart electronic products has put forward higher requirements for the battery life of lithium-ion batteries, and the way people use digital products has also put forward additional requirements for the performance of lithium-ion batteries. For example, when people use a laptop computer, the lithium-ion battery is often in a full state after it is fully charged, and the lithium-ion battery will only discharge and work when it is away from the power supply, that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 唐超付成华王小梅陈培培龙兵
Owner NINGDE AMPEREX TECH
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