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Electrochemical device and electronic device comprising the same

An electrochemical and compound technology, applied in the field of electrochemistry, can solve the problems of hindering lithium ion conduction, affecting the kinetic performance of lithium ion batteries, and increasing the impedance of the positive and negative electrodes of the battery, so as to improve safety performance, improve kinetic performance, and improve The effect of safety features

Pending Publication Date: 2022-01-11
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the above problems, film-forming additives are usually added to form a thicker and denser solid electrolyte interface (SEI) film and positive electrode electrolyte interface (CEI) film to inhibit the reaction, but when the SEI film and CEI film are thick, they will hinder lithium ions. conduction, which leads to an increase in the impedance of the positive and negative electrodes of the battery and affects the kinetic performance of the lithium-ion battery

Method used

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

Examples

Experimental program
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preparation example Construction

[0056] Based on the preparation method of the conventional lithium-ion battery, the reference electrode is embedded into the lithium-ion battery during winding to obtain the lithium-ion battery containing the reference electrode. First, place the lithium-ion battery containing the reference electrode in a constant temperature environment of 25°C, use the reference electrode as the anode, and use the positive and negative poles of the battery as the cathode respectively, electroplate with a current of 2mA for 2h, deposit lithium on the reference electrode, and statically After 30 min, the electrochemical impedance spectroscopy (EIS) of the lithium-ion battery was tested using the Bio-Logic VMP3 electrochemical workstation. The working electrode of the electrochemical workstation is connected to the negative electrode of the battery, and the reference electrode of the electrochemical workstation is connected to the reference electrode lead of the battery. The test frequency rang...

Embodiment 1-1

[0065]

[0066] In an argon atmosphere glove box with a water content of V The first lithium salt lithium hexafluorophosphate (LiPF 6 ) dissolved and mixed evenly, then add the mass percentage W I The compound formula I-10 represented by the general formula (I) and the mass percentage content W II The compound formula II-2 represented by the general formula (II) was stirred uniformly to obtain an electrolyte solution. Among them, based on the quality of the electrolyte, the first lithium salt LiPF 6 The mass percentage composition of is 12.5%, and the compound mass percentage composition W of general formula (I) expression I 0.5%, the mass percentage of the compound represented by general formula (II) W II 1%, and the rest is the base solvent.

[0067]

[0068] The positive electrode active material lithium cobalt oxide (LiCoO 2 ), the conductive agent conductive carbon black (Super P), and the binder polyvinylidene fluoride (PVDF) are mixed according to the mass rati...

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Abstract

The embodiment of the invention provides an electrochemical device and an electronic device comprising the electrochemical device, the electrochemical device comprises an electrolyte, and the electrolyte comprises a compound represented by a general formula (I) and a compound represented by a general formula (II). The compound represented by the general formula (I) and the compound represented by the general formula (II) are simultaneously added into the electrolyte to form a synergistic effect, so that the dynamic performance, such as high-temperature storage performance and initial impedance, of the electrochemical device can be effectively improved. And moreover, the electrolyte can inhibit high-temperature storage gas production of the electrochemical device, so that the safety performance of the electrochemical device is improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, in particular to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] With the rapid development of electronic products, lithium-ion batteries are widely used in mobile phones, notebook computers, tablet computers, drones, electric vehicles, power tools, power storage systems, etc. due to their advantages of high energy density, miniaturization and light weight. . [0003] At higher temperatures, the activity of the positive and negative electrodes of lithium-ion batteries is significantly enhanced, and they will react with the electrolyte to induce problems such as gas production. In order to solve the above problems, film-forming additives are usually added to form a thicker and denser solid electrolyte interface (SEI) film and positive electrode electrolyte interface (CEI) film to inhibit the reaction, but when the SEI...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 简俊华郭和峰唐超
Owner DONGGUAN AMPEREX TECH
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