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Electrolyte and electrochemical device

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve problems such as the deterioration of the stability of the positive electrode, and achieve the effect of solving the problem of self-discharge and improving the safety characteristics.

Active Publication Date: 2020-06-26
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, increasing the charging cut-off voltage of lithium-ion batteries is one of the effective means to increase energy density, but the increase in voltage leads to poor stability of the positive electrode. How to solve the above problems to improve the energy density of lithium-ion batteries has become an urgent need to solve in this field. The problem

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

[0067] 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.

[0068] The negative active material includes a material that reversibly intercalates / deintercalates lithium ions. In some embodiments, the material that reversibly intercalates / deintercalates lithium ions includes a carbon material. In some embodiments, the carbon material can be any carbon-based negative active material commonly used in lithium-ion rechargeable batteries. In some embodiments, carbon materials include, but are not limited to, crystalline carbon, amorphous carbon, or mixtures thereof. The crystalline carbon may be amorphous, platelet, platelet, spherical or fibrous natural graphite or artificial graphite. The amorphous carbon may be...

Embodiment

[0115] Hereinafter, although an Example and a comparative example are given and this application is demonstrated more concretely, unless it deviates from the summary, this application is not limited to these Examples.

[0116] 1. Preparation of lithium-ion batteries

[0117] (1) Preparation of negative electrode

[0118] (i) The negative electrode formed by welding the tabs

[0119]Dissolve artificial graphite powder, sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber in water at a mass ratio of 96:2:2, mix and stir thoroughly to obtain negative electrode slurry, and evenly coat the negative electrode slurry on a surface with a thickness of 12 Baking at 120°C for 1 hour on a specific area of ​​the negative electrode current collector copper foil with a micron size yields a negative electrode active material layer, and then compacts, cuts, and welds tabs to obtain the negative electrode.

[0120] (ii) The negative electrode formed by cutting the tab

[0121] ...

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Abstract

The invention relates to an electrolyte and an electrochemical device. Particularly, the invention provides the electrolyte containing a nitrile compound and a lithium ion battery containing the electrolyte. When the product of the mass ratio of the nitrile compound in the electrolyte and the ratio of the area of a region on a negative electrode current collector that does not contain the negativeelectrode active material to the surface area of the current collector is defined within a certain range, the self-discharge of the electrochemical device can be reduced while the cycling stability of the electrochemical device is improved, and the long-term storage performance of the electrochemical device is improved.

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] Electrochemical devices represented by 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, and drones. , and fields such as electric vehicles. With the development of modern information technology and the expansion of the application range of lithium-ion batteries, the energy density of lithium-ion batteries in this field has higher requirements. [0003] There are many factors that affect the energy density of Li-ion batteries. At present, increasing the charging cut-off voltage of lithium-ion batteries is one of the effective means to increase energy density, but the increase in voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 张丽兰唐超郑建明
Owner NINGDE AMPEREX TECH