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
CN111430795AActive Publication Date: 2020-07-17NINGDE AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGDE AMPEREX TECH
Publication Date
2020-07-17

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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.
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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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