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Electrochemical device and electronic device including same

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve problems such as the performance deterioration of electrochemical devices

Active Publication Date: 2021-09-21
NINGDE AMPEREX TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0005] On the one hand, the application provides a kind of electrochemical device, and described electrochemical device comprises the negative electrode active material that comprises silicon material and comprises the electrolytic solution of fluorocarbonate and cyclic ether, by controlling the weight of fluorocarbonate and cyclic ether The percentage and the unit reaction area of ​​the negative electrode active material layer satisfy a certain relationship, which can improve the high-temperature storage performance and high-temperature cycle performance of the electrochemical device, thereby solving the problem of deterioration in the performance of the electrochemical device using silicon negative electrode materials

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  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same

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[0078] The positive electrode can be prepared by a preparation method known in the art. For example, the positive 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 N-methylpyrrolidone and the like, but is not limited thereto.

[0079] In some embodiments, the positive electrode is made by forming a positive electrode material using a positive electrode active material layer including lithium transition metal compound powder and a binder on a current collector.

[0080] In some embodiments, the positive electrode active material layer can generally be made by performing the following operations: dry mixing the positive electrode material and the binder (conductive material and thickener used as needed) to make a sheet, and The obtained sheet is pressure-bonded to the po...

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Abstract

The present application relates to an electrochemical device and an electronic device including the same. Specifically, the electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolyte, wherein the negative electrode includes a negative active material layer, and the negative active material layer contains a silicon material, and wherein the electrolyte includes fluorocarbonate and Cyclic ether, the weight percentage of the fluorocarbonate and cyclic ether satisfies a certain relationship with the unit reaction area of ​​the negative electrode active material layer, so that the high-temperature storage performance and high-temperature cycle performance of the electrochemical device can be improved.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular to an electrochemical device and an electronic device including the same. Background technique [0002] In recent years, electrochemical devices, such as lithium-ion batteries, have attracted much attention due to their high energy density and high cycle performance. Lithium-ion batteries are widely used in various fields, especially in electronic consumer products. As the market pursues thinner and lighter electronic products, the requirements for the energy density of batteries are getting higher and higher. Silicon has a high capacity, and the specific capacity of crystalline silicon can reach 4200mAh / g (Li4.4Si) in the state of fully intercalating lithium. Therefore, silicon materials have attracted extensive attention in recent years. However, the volume expansion of silicon materials during charge and discharge will destroy the formed solid electrolyte interp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/38H01M4/485H01M4/587H01M10/0567
CPCH01M10/0525H01M10/0567H01M4/386H01M4/485H01M4/587H01M2004/027Y02E60/10H01M2300/0034H01M2300/0037H01M10/0569H01M4/134H01M4/366H01M4/133H01M4/628
Inventor 张水蓉刘俊飞唐超
Owner NINGDE AMPEREX TECH