Electrochemical device and electronic device comprising same

An electrochemical and compound technology, applied in the field of energy storage, can solve the problems of inability to achieve charging speed, greatly improve, and reduce performance, and achieve the effect of improving fast charging performance

Active Publication Date: 2020-07-17
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing research on rapid charge and discharge technology often only improves materials (graphite or optimized electrolyte), focuses on the impedance of a single aspect of lithium-ion batteries, and lacks in-depth research on the entire system, resulting in the inability to achieve a substantial increase in charging speed. In the pursuit of fast charge and discharge performance, other aspects of performance have to be reduced, such as cycle performance

Method used

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  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same

Examples

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preparation example Construction

[0107] 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.

[0108] 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

[0141] 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.

[0142] 1. Preparation of Li-ion battery

[0143] (1) Preparation of negative electrode

[0144] The negative electrode active material includes first particles and second particles, wherein the first particles are secondary particles, and the secondary particles contain no less than two primary particles. The Dv50 of the primary particles in the secondary particles is 2 to 10 microns, and the Dv50 of the secondary particles is 5 to 20 microns. The second particle is a primary particle, and the Dv50 of the second particle is 3 microns to 10 microns.

[0145] Negative electrode active materials with different specific surface areas and porosities are obtained by controlling the graphitization temperature during preparation and the ratio of the first particle to...

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Abstract

The invention relates to an electrochemical device and an electronic device comprising the same. The electrochemical device comprises an electrolyte, a positive electrode and a negative electrode. Thenegative electrode comprises a negative electrode active material layer, the negative electrode active material layer includes a negative electrode active material, and the electrolyte includes fluoroethylene carbonate, wherein the electrochemical device satisfies the following relational expressions: 0.5 < Rct / Rcp < 1.5, both Rct and Rcp are less than 35 milliohms, and 0.005 <= A / B <= 0.1; Rct represents the charge transfer impedance in a 50% state of charge at 25 DEG C, and Rcp represents the concentration polarization impedance in a 50% state of charge at 25 DEG C; the mass of the fluoroethylene carbonate corresponding to 1g of the negative electrode active material is Ag, and the specific surface area of the negative electrode active material is B m <2> / g. The invention aims to improve the quick charging performance of the electrochemical device while maintaining the cycle performance of the electrochemical device.

Description

technical field [0001] The present application relates to the technical field of energy storage, and in particular to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] Electrochemical devices (eg, lithium-ion batteries) have the advantages of high energy density, long cycle life, and no memory effect, and are widely used in wearable devices, smartphones, drones, and even electric vehicles. With the expansion of the application of lithium-ion batteries and the development of information technology, higher performance requirements are put forward for lithium-ion batteries—fast charging and discharging, and excellent cycle performance. [0003] Existing research on rapid charge and discharge technology often only improves materials (graphite or optimized electrolyte), focuses on the impedance of a single aspect of lithium-ion batteries, and lacks in-depth research on the entire system, resulting in the inabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M4/587H01M2004/027H01M2300/0025Y02E60/10Y02P70/50
Inventor 崔辉郑建明王翔管明明
Owner NINGDE AMPEREX TECH
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