Electrochemical device and electronic device

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve the irreversible reduction reaction of lithium ions, reduce the charge-discharge cycle efficiency of lithium-ion batteries, affect the high-temperature cycle and expansion performance and safety of lithium-ion batteries, etc.

Active 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

[0003] During the use of lithium-ion batteries, when the charging control circuit fails, the lithium-ion battery is prone to overcharge, causing an irreversible reduction reaction of lithium ions in the negative electrode, reducing the charge-discharge cycle efficiency of the lithium-ion battery
When the charging voltage reaches the decomposition voltage of the electrolyte, the el

Method used

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

Examples

Experimental program
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Effect test

preparation example Construction

[0119] Preparation of negative electrode

[0120] 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.

[0121] II. Electrolyte

[0122] 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.

[0123] Another main feature of the electrochemical device o...

Embodiment

[0282] The performance evaluation of the examples and comparative examples of the lithium-ion battery according to the present application will be described below.

[0283] 1. Preparation of lithium ion battery

[0284] 1. Preparation of negative electrode

[0285] 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 negative electrode slurry. This negative electrode slurry was coated on a 12 μm current collector. Drying, cold pressing, cutting into pieces and welding tabs to obtain the negative electrode.

[0286] 2. Preparation of positive electrode

[0287] Lithium cobalt oxide (LiCoO 2 ), conductive material (Super-P) and polyvinylidene fluoride (PVDF) are mixed with N-methylpyrrolidone (NMP) according to the mass ratio of 95%:2%:3%, and stirred evenly to obtain positive electrode slurry. The positive electrode slurry was coated on a 12 μm aluminum foil, dried,...

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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 mixture layer formed on the negative electrode current collector, the negative electrode current collector contains tin, and the electrolytic solution comprises a compound containing a sulfur-oxygen double bond. The electrochemical device provided by the invention has improved high-temperature cycle performance and anti-overcharge performance.

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] With the development of technology and the increase in the demand for mobile devices, people's demand for electrochemical devices (such as lithium-ion batteries) under different usage conditions has increased significantly, thus putting forward higher requirements for the performance of lithium-ion batteries, Including high capacity, long cycle life, high temperature resistance, high rate discharge performance and anti-overcharge performance, etc. [0003] During the use of lithium-ion batteries, when the charging control circuit fails, the lithium-ion battery is prone to overcharge, causing an irreversible reduction reaction of lithium ions in the negative electrode, reducing the charge-discharge cycle efficiency of the lithium-ion battery. When the chargin...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/66H01M10/0525H01M10/0567H01M10/42
CPCH01M4/13H01M10/0525H01M10/0567H01M4/139H01M4/661H01M4/662H01M10/4235Y02E60/10
Inventor 王可飞
Owner NINGDE AMPEREX TECH
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