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Electrolyte and electrochemical device

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve the problems of battery capacity attenuation, damage to the surface protective layer of silicon materials, and intensified side reactions between the negative electrode and the electrolyte.

Pending Publication Date: 2020-11-27
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon negative electrode will experience large volume expansion during the charging and discharging process, the protective layer on the surface of the silicon material will be damaged, and the side reaction between the negative electrode and the electrolyte will intensify, resulting in battery gas production and rapid decline in battery capacity.

Method used

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  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device

Examples

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preparation example Construction

[0089] The negative electrode can be prepared by a preparation method known in the art. For example, the negative electrode may be obtained by mixing an active material, a conductive material, and a binder in a solvent to prepare an active material composition, and coating the active material composition on a current collector. In some embodiments, the solvent may include water, etc., but is not limited thereto.

[0090] positive electrode

[0091] The material of the positive electrode used in the electrochemical device of the present application can be prepared using materials, configurations, and manufacturing methods known in the art. In some embodiments, the positive electrode of the present application can be prepared using the technique described in US9812739B, which is incorporated in this application by reference in its entirety.

[0092] In some embodiments, the positive electrode includes a current collector and a positive active material layer on the current coll...

Embodiment 1 to Embodiment 20， and comparative example 1 and comparative example 2

[0125] The electrolyte solutions and lithium ion batteries of Examples 1 to 20 and Comparative Examples 1 and 2 were prepared according to the above methods (1) to (5).

Embodiment 21

[0127] The electrolyte solution and lithium ion battery of Example 21 were prepared, wherein the negative electrode was prepared according to the method described in the next paragraph, and the others were prepared according to the above methods (2) to (5).

[0128] Taking by weighing 3.6kg mass fraction is the thickener sodium carboxymethylcellulose (CMC) solution of 1.5% by weight, 0.3kg massfraction is the binder styrene-butadiene rubber emulsion of 50% by weight, 6.0kg graphite powder negative electrode active material, 1.2Kg of silicon oxide negative electrode active material SiO coated with metal oxide on the surface (the composition and thickness of the coating layer are shown in Table 1); the material is fully mixed and stirred to obtain the negative electrode slurry, and then the negative electrode slurry is evenly coated On the negative electrode current collector copper foil with a thickness of 8 microns, and then baked at 120 ° C for 1 hour, the active material load...

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Abstract

This application provides an electrolyte and an electrochemical device. The electrolyte of the present application includes a sulfonic anhydride compound, which can significantly improve the cycle life of the silicon anode electrochemical device and the problems of gas generation under overdischarge, so that the electrochemical device has excellent cycle performance and high temperature stabilityunder overdischarge conditions.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrolyte and an electrochemical device containing the electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, low self-discharge rate, long cycle life, and no pollution. They have been widely used in computers, smart wearable devices, smartphones, drones, and electric vehicles. With the development of modern information technology and the expansion of the application range of lithium-ion batteries, there are higher requirements for the battery life of lithium-ion batteries in this field. [0003] There are many factors that affect the endurance of lithium-ion batteries. Replacing the traditional graphite anode with a silicon anode is considered to be an effective means to further increase the energy density of lithium-ion batteries. However, the silicon negative electrode will und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M4/134H01M4/366H01M4/483H01M2004/027B82Y30/00Y02E60/10C07D327/00H01M10/0567H01M4/587H01M10/0569H01M4/625H01M4/133H01M4/583H01M10/0568H01M2004/021H01M2004/028
Inventor 唐超刘俊飞张丽兰郑建明
Owner NINGDE AMPEREX TECH