Electrochemical device and electronic device

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve problems such as combustion, aggravation of chemical reactions of lithium-ion batteries, thermal runaway of lithium-ion batteries, etc.

Pending Publication Date: 2020-12-29
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat generated inside the lithium-ion battery cannot be released quickly, the temperature of the lithium-ion battery will continue to rise, which will intensify the chemical reaction in the lithium-ion battery, and eventually lead to thermal runaway of the lithium-ion battery, until explosion, combustion and other safety accidents

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

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Effect test

preparation example Construction

[0091] Preparation of negative electrode

[0092] The negative electrode in the electrochemical device of the present application can be prepared using any known method. For example, a binder, a solvent, a thickener, a conductive material, a filler, etc. are added to the negative electrode active material to form a slurry, and the slurry is coated on the negative electrode current collector, and after drying, press to form electrodes. The negative electrode active material can also be roll-formed to form a sheet-like electrode, or formed into a granular electrode by compression-molding.

[0093] II. Electrolyte

[0094] The electrolytic solution used in the electrochemical device of the present application includes an electrolyte and a solvent for dissolving the electrolyte. In some embodiments, the electrolyte solution used in the electrochemical device of the present application further includes additives.

[0095] According to some embodiments of the present applica...

Embodiment

[0236] The performance evaluation of the examples and comparative examples of the lithium-ion battery according to the present application will be described below.

[0237] 1. Preparation of lithium ion battery

[0238] 1. Preparation of negative electrode

[0239] According to the setting of comparative example and embodiment, conductive material, binder (when there is conductive material, the mass ratio of conductive material and binder is 64.5%:35.5%) are mixed with deionized water, stir evenly , to obtain the first slurry. This first slurry was coated on copper foil.

[0240] Mix artificial graphite, styrene-butadiene rubber and sodium carboxymethyl cellulose with deionized water in a mass ratio of 96%:2%:2%, and stir evenly to obtain a second slurry. The second slurry was coated on the copper foil loaded with the first slurry. Drying, cold pressing, cutting into pieces and welding tabs to obtain the negative electrode.

[0241] 2. Preparation of positive electrode

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Abstract

The invention relates to an electrochemical device and an electronic device, and specifically provides an electrochemical device, which comprises a positive electrode, a negative electrode and an electrolytic solution, wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, the negative electrode active material layer containing a negative electrode active material, a conductive material is provided between the negative electrode active material layer and the negative electrode current collector, an average particle diameter of the conductive material is smaller than an average particle diameter of the negative electrode active material, and the negative electrode active material layer has a specific weight. The electrochemical device provided by the invention has improved high-temperature cycle expansion performance and overcharge resistance.

Description

technical field [0001] The present application relates to the field of energy storage, in particular to an electrochemical device and an electronic device, especially a lithium ion battery. Background technique [0002] Electrochemical devices (such as lithium-ion batteries) have the advantages of high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, and have been widely used in digital products, electric vehicles, etc. , hybrid vehicles and many other fields. With the widespread application of lithium-ion batteries, their safety performance has also received more and more attention. [0003] The safety hazard of lithium-ion batteries is mainly caused by internal overheating. If the heat generated inside the lithium-ion battery cannot be released quickly, the temperature of the lithium-ion battery will continue to rise, which will intensify the chemical reaction in the lithium-ion battery, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/0567H01M10/42
CPCH01M4/13H01M4/625H01M4/622H01M10/0525H01M10/4235H01M10/0567Y02E60/10H01M4/623H01M4/64H01M4/366H01M10/0566H01M10/0568
Inventor 王可飞师亮
Owner NINGDE AMPEREX TECH
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