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Trimethylsilyl compound, electrolyte and lithium ion battery

A technology of trimethylsilyl and electrolyte, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of no obvious effect of HF generation and large interface film impedance, so as to suppress side reactions, avoid reactions, Effect of improving long-term cycle performance

Pending Publication Date: 2022-05-13
苏州华赢新能源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a kind of trimethylsilyl compound and electrolytic solution and lithium-ion battery, solves the interfacial film resistance formed by the film-forming additive in the existing lithium-ion battery electrolyte that is relatively large, and to The problem that suppressing the generation of HF in the electrolyte has no obvious effect

Method used

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  • Trimethylsilyl compound, electrolyte and lithium ion battery
  • Trimethylsilyl compound, electrolyte and lithium ion battery
  • Trimethylsilyl compound, electrolyte and lithium ion battery

Examples

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Effect test

Embodiment 1

[0046] Preparation of initial electrolyte: in a glove box filled with argon (H 2 O99.99%), mix ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate at a volume ratio of 1:1:1, and then dissolve lithium hexafluorophosphate in it at a concentration of 1mol / L to obtain the initial electrolyte.

[0047]Preparation of the electrolyte solution: adding the trimethylsilyl compound having the structural formula A1 to the initial electrolyte solution at a mass fraction of 3% to obtain the electrolyte solution.

[0048] Assembly of lithium-ion full battery: positive electrode LiNi 0.8 co 0.1 mn 0.1 o 2 The pole piece and the negative pole are made of artificial graphite pole piece, and the positive and negative pole pieces are made through processes such as slurry stirring, coating, drying, rolling, slicing, and vacuum drying, and the above-mentioned electrolyte is added to package the battery. The battery is subjected to a constant current charge and discharge test at ...

Embodiment 2

[0055] In this example, the electrolyte is prepared according to the method of Example 1, the difference is that the trimethylsilyl compound in this example is a trimethylsilyl compound with the A3 structural formula; when assembling a lithium-ion full battery, use LiNi 0.5 co 0.2 mn 0.3 o 2 Positive plate replaces LiNi 0.8 co 0.1 mn 0.1 o 2 pole piece.

[0056] The reversible specific capacity of the battery prepared in Example 2 during long-term cycle is as follows: Image 6 shown.

Embodiment 3

[0058] In this example, the electrolyte is prepared according to the method of Example 1, the difference is that the trimethylsilyl compound in this example is a trimethylsilyl compound with the A6 structural formula; when assembling a lithium-ion full battery, use LiNi 0.6 co 0.2 mn 0.2 o 2 Positive plate replaces LiNi 0.8 co 0.1 mn 0.1 o 2 pole piece.

[0059] The reversible specific capacity of the battery prepared in embodiment 3 during long-term cycle is as follows: Figure 7 shown.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a trimethylsilyl compound, and the trimethylsilyl compound contains an unsaturated substituent group. The invention also provides an electrolyte containing the trimethylsilyl compound and a lithium ion battery, when the trimethylsilyl compound is used as an electrolyte additive, on one hand, HF in the electrolyte can be eliminated by means of the strong effect of Si-F chemical bonds, etching and damage of HF to phase interface films on the surfaces of a positive electrode and a negative electrode are avoided, and the service life of the electrolyte is prolonged; the dissolution of transition metal elements in the positive electrode material is inhibited; and on the other hand, unsaturated functional groups can be subjected to polymerization reaction, so that the decomposition of a solvent and a lithium salt component in the electrolyte is inhibited, the discharge capacity of the lithium ion battery is improved, and the long-term cycle performance of the battery in normal-temperature and low-temperature environments is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a trimethylsilyl compound, an electrolyte and a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in 3C digital products, new energy electric vehicles and energy storage power stations. Energy density, service life, safety, and high-current charging and discharging capabilities are the core parameters for evaluating battery performance. At the same time, taking into account regional environmental differences, the balance between high and low temperature performance is also a technical problem that needs to be overcome. [0003] The solid / electrolyte phase interface on the surface of the positive and negative electrodes in lithium-ion batteries is closely related to the performance of the battery. For example, the structure of the solid / electrolyte phase interface on the surface of the graphite negative e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567
CPCH01M10/0525H01M10/0566H01M10/0567
Inventor 曲群婷郑洪河邵杰李宇宸龙富曹章
Owner 苏州华赢新能源材料科技有限公司
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