Electrolyte as well as preparation method and application thereof

An electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of deterioration of cycle performance, accelerated electrolyte consumption, damage to SEI film, etc., to achieve the effect of improving capacity retention rate, reducing impedance and prolonging service life

Active Publication Date: 2022-02-25
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the electrolyte additives in the above prior art improve the cycle performance of the battery from the film-forming properties of the SEI film and the impedance reduction, etc., the acidic substances (such as hydrogen) produced by side reactions in the electrolyte in the middle and la

Method used

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  • Electrolyte as well as preparation method and application thereof
  • Electrolyte as well as preparation method and application thereof
  • Electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0055] This embodiment provides an electrolyte and a preparation method thereof. The electrolyte includes the following components in terms of mass percentage: 12.5% ​​lithium hexafluorophosphate, 0.5% lithium difluorophosphate, sultone compound (shown in formula II structure, ) 0.5%, vinylene carbonate 3%, and the balance is an organic solvent; the organic solvent is ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate with a mass ratio of 5:1:10:4 mixed solvents.

[0056] The preparation method of the electrolyte is as follows: uniformly mix lithium hexafluorophosphate, lithium difluorophosphate, sultone compound, vinylene carbonate and an organic solvent according to the formula to obtain the electrolyte.

Embodiment 2

[0058] This embodiment provides an electrolyte solution and its preparation method, which differs from Embodiment 1 only in that the sultone compound has the structure shown in formula III

Embodiment 3

[0060] This embodiment provides an electrolyte solution and its preparation method, which differs from Embodiment 1 only in that the sultone compound has the structure shown in formula IV Other components, proportioning and preparation method are all identical with embodiment 1.

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Abstract

The invention provides an electrolyte as well as a preparation method and application thereof. The electrolyte comprises a lithium salt, an additive and an organic solvent; the additive comprises a sultone compound with a structure as shown in a formula I. According to the electrolyte, components are designed, particularly, the sultone compound with a specific structure is adopted as the additive, so that a dense, stable and elastic SEI film is formed in the charging and discharging process of a battery, the lithium ion conductivity of the SEI film is improved, the impedance can be effectively reduced, side reactions are reduced; and the consumption and degradation of the electrolyte in the use process are reduced, so that the internal resistance of the battery is reduced, the capacity retention ratio of the battery is high, the normal-temperature and high-temperature cycle performance of the battery is remarkably improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolytic solution and a preparation method and application thereof. Background technique [0002] With the continuous enhancement of public energy awareness, the development and efficient use of energy has gradually become a global focus, and various battery systems have emerged to meet the growing demand for electric vehicles and large-scale energy storage. Among portable electronic devices that have attracted much attention at present, lithium-ion batteries have become the first choice due to their advantages of high energy, high density, flexible and lightweight design, and longer life than similar batteries. One of the key issues in the rapid development of the industry. In order to improve the performance of lithium-ion batteries, a small amount of additives are usually added to the electrolyte to preferentially form a layer of organic insol...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 李迟苑丁丁刘范芬张伟康
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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