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Positive electrode and electrochemical device and electronic device containing same

A technology of positive electrode and positive active material, applied in the field of energy storage, can solve the problems of reduced electronic conductance, not a very good conductive agent, increased resistance, etc., and achieves the effect of good application prospects.

Active Publication Date: 2021-03-05
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing literature (eg, Du et al., "Influence of Electronic ConductingAdditives on Cycle Performance of Garnet-based Solid Lithium Batteries", 2018, Journal of Inorganic Materials, Volume 33, Pages 462–468 and Zhao et al., "SolidGarnet Batteries", 2019, Joule, Volume 3, Pages 1–10) pointed out: In high voltage system, carbon material is not a good conductive agent; When the voltage is greater than or equal to 4.5V) for a long time charge and discharge cycle, the carbon material as the conductive agent will be accelerated to oxidize to form carbonate, resulting in an increase in resistance and a decrease in electronic conductance, and eventually the lithium-ion battery will accelerate failure due to polarization growth

Method used

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  • Positive electrode and electrochemical device and electronic device containing same
  • Positive electrode and electrochemical device and electronic device containing same
  • Positive electrode and electrochemical device and electronic device containing same

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preparation example Construction

[0044] The positive electrode can be prepared by a preparation method known in the art. For example, the positive electrode can be obtained by mixing a positive electrode active material, a conductive agent, and a binder in a solvent in a certain proportion to prepare a positive electrode slurry, and coating the positive electrode slurry on a positive electrode current collector to prepare a positive electrode. In some embodiments, the solvent may include N-methylpyrrolidone and the like, but is not limited thereto. In some embodiments, the positive current collector may be aluminum, but is not limited thereto.

[0045] The conductive agent of the present application is a non-carbon material, which eliminates the increase in resistance and the accelerated failure of the battery due to polarization growth in the prior art due to the oxidation of the carbon material of the conductive agent to form carbonate after a long cycle at high voltage. risk. By adding nano-scale semicon...

Embodiment 1

[0071] LiCoO 2 : polyvinylidene fluoride: indium oxide = weight ratio of 95:1.5:3.5, mix it evenly, coat, cold press, and punch to prepare positive electrode sheet, wherein the particle size of indium oxide is 17nm-28nm.

[0072] The coin half-cell was assembled with the prepared positive electrode as the working electrode and metal lithium as the counter electrode, and the cycle performance test was carried out on the assembled coin-type half-cell.

Embodiment 2

[0074] LiCoO 2 : polyvinylidene fluoride: indium oxide = 80:10:10 weight ratio, mix it evenly, coat, cold press, and punch to prepare positive electrode sheet, wherein the particle size of indium oxide is 17nm-28nm.

[0075] The coin half-cell was assembled with the prepared positive electrode as the working electrode and metal lithium as the counter electrode, and the cycle performance test was carried out on the assembled coin-type half-cell.

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Abstract

The present application relates to a positive electrode and an electrochemical device and an electronic device including the same. The positive electrode includes a conductive agent, wherein the conductive agent includes a non-carbon material. The present application provides a positive electrode containing a conductive agent resistant to high-voltage oxidation, which can effectively improve the high-voltage cycle performance of an electrochemical device.

Description

technical field [0001] The present application relates to the field of energy storage technology, and in particular to a positive electrode and an electrochemical device and an electronic device including the same. The positive electrode includes a conductive agent containing a non-carbon material. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric transportation, national defense aviation and energy storage due to their advantages such as high energy density, high power density, long life, good safety, low self-discharge and wide temperature range. . In order to further meet the market demand for high energy density batteries, broadening the charge cut-off voltage of cathode materials and developing new materials with higher specific energy are becoming an imperative research direction. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/624H01M10/0525Y02E60/10H01M4/525H01M4/131H01M4/1391H01M10/052H01M4/505H01M4/623H01M4/626H01M2004/028
Inventor 周墨林
Owner NINGDE AMPEREX TECH
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