A lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, secondary battery repair/maintenance, circuits, etc. Freezing point and other problems to improve reversible capacity and cycle performance, reduce irreversible capacity loss, and inhibit dissolution.

Active Publication Date: 2022-07-22
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the electrolyte flame retardants reported in current patents or literatures have good flame retardant effects, most of them have disadvantages such as high viscosity and high freezing point, which have a relatively large negative impact on the electrochemical performance of the electrolyte.
In view of this, it is necessary to provide a highly efficient flame-retardant and electrochemically compatible lithium-ion battery electrolyte additive and its electrolyte, so as to solve the problem that the flame-retardant performance and electrochemical performance of batteries in the prior art cannot be balanced

Method used

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  • A lithium ion battery electrolyte and lithium ion battery
  • A lithium ion battery electrolyte and lithium ion battery
  • A lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of electrolyte: In a glove box filled with argon, ethylene carbonate, diethyl carbonate and methyl ethyl carbonate were mixed in a mass ratio of EC:DEC:EMC=1:1:1, and then added to the mixed solution. Slowly add 12.5 wt % lithium hexafluorophosphate based on the total weight of the electrolyte, 0.5 wt % lithium bisfluorosulfonimide (LiTFSI) based on the total weight of the electrolyte, and 1.25 wt % lithium bisfluorosulfonimide based on the total weight of the electrolyte (LiFSI), and finally add 0.5 wt % of additive A with the structure shown in formula I, 3 wt % of additive B with formula II, 0.5 wt % of vinyl sulfate (DTD) and 3.0 wt % of fluorine based on the total weight of the electrolyte. Substitute ethylene carbonate (FEC), and stir to obtain the lithium ion battery electrolyte of Example 1.

[0035] Preparation of lithium ion battery: stack the obtained positive electrode sheets, separators, and negative electrode sheets in order, so that the separa...

Embodiment 2-14

[0036] Examples 2-14 and Comparative Examples 1-9

[0037] In Examples 2-14 and Comparative Examples 1-9, except that the composition ratio of each component of the electrolyte solution is added as shown in Table 1, the rest are the same as those in Example 1. In addition, the structural formula of the additive of formula I and the structural formula of the additive of formula II in each embodiment are shown in Table 2.

[0038] Table 1 embodiment 1-14 and the electrolyte composition ratio of each component of comparative example 1-9

[0039]

[0040]

[0041] Structural Formula I and Structural Formula II Specific Substance Descriptions in the Examples of Table 2

[0042]

[0043]

[0044] Performance Testing

[0045] Relevant performance tests were carried out on the batteries prepared in Examples 1-14 and Comparative Examples 1-9 and their electrolytes.

[0046] (1) Normal temperature cycle performance test: At 25°C, the battery after capacity division is cha...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte includes a lithium salt, a non-aqueous organic solvent and an additive, and the additive includes a thiophene having the structure of formula I Phosphate ester compound additive A, polyphenolic compound additive B having the structure of formula II, and negative electrode film-forming additive C. Compared with the prior art, the lithium ion battery electrolyte provided by the present invention with both flame retardant properties and electrochemical properties is achieved through the combination of thiophene phosphate compound additives, polyphenol compound additives, negative electrode film-forming additives and lithium salt type additives. Due to the synergistic effect, the electrolyte has excellent film-forming performance on the surface of the electrode, so that the lithium ion battery has good electrochemical performance and safety performance, thereby solving the problem that the flame retardant performance and electrochemical performance of the battery in the prior art cannot be taken into account.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. They are widely used in 3C digital products, electric vehicles, aerospace, and energy storage. However, safety performance is the first key issue facing the large-scale application of lithium-ion batteries. In recent years, reports about the burning and even explosion of lithium-ion batteries are common, and the safety of lithium-ion batteries has attracted widespread attention. [0003] At present, lithium-ion battery electrolytes are widely based on carbonate organic solvents, such as ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. These s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 张丽娟熊伟徐宝杨山陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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