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Method for improving electrochemical performance of lithium-rich manganese-based oxide positive electrode material

A cathode material, lithium-rich manganese-based technology, applied in the field of cathode materials for lithium ion batteries, can solve the problems of poor cycle performance, sample surface defects, affecting electrochemical performance, etc., and achieve the effect of enhancing electrical conductivity and improving environmental stability.

Pending Publication Date: 2022-03-25
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material has low Coulombic efficiency and poor cycle performance for the first time, which hinder its commercialization process.
Residual alkali is ubiquitous on the surface of lithium-rich manganese-based oxide cathode materials. Traditional residual alkali removal methods can easily lead to defects on the surface of the sample and affect its electrochemical performance.

Method used

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  • Method for improving electrochemical performance of lithium-rich manganese-based oxide positive electrode material
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  • Method for improving electrochemical performance of lithium-rich manganese-based oxide positive electrode material

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Embodiment Construction

[0016] In order to facilitate understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to this specific embodiment.

[0017] Unless otherwise defined, all technical terms used hereinafter have the same meanings as commonly understood by those skilled in the art. The terminology used herein is only for the purpose of describing specific embodiments, and is not intended to limit the protection scope of the present invention.

[0018] Unless otherwise specified, the various reagents and raw materials used in the present invention are commercially available products or products that can be prepared by known methods.

[0019] step 1:

[0020] Mix citric acid and acetic acid according to the mass ratio of 2:1 to prepare a deionized aqueous solution with an acid concentration of 40 wt%.

[0021] Step 2:

[0022] Under continuou...

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Abstract

The invention discloses a method for improving the electrochemical performance of a lithium-rich manganese-based oxide positive electrode material. The surface of the lithium-manganese-rich positive electrode material is subjected to simple acid pickling and low-temperature roasting treatment, so that the first charge-discharge efficiency and the cycle stability of the lithium-manganese-rich positive electrode material are effectively improved. The first specific discharge capacity under the current rate of 0.1 C is increased from 225.0 mAh / g to about 262.5 mAh / g, and the capacity retention ratio after 100 cycles under the current rate of 1 C is increased from 61.0% to about 81.0%.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a method for removing residual alkali from the surface of lithium-rich manganese-based oxide positive electrode materials to improve its electrochemical performance. Background technique [0002] As an energy storage device with excellent comprehensive performance, lithium-ion batteries are widely used in various fields of modern society. Lithium-rich manganese-based oxide cathode materials have become the next generation of lithium-ion batteries due to their advantages such as high energy density, good safety performance, and low price. A strong competitor for battery cathode materials. However, the material has low initial Coulombic efficiency and poor cycle performance, which hinder its commercialization. Residual alkali is ubiquitous on the surface of lithium-rich manganese-based oxide cathode materials, and traditional residu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M10/0525
CPCH01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 倪文浩杨建文黄斌刘鑫鑫李欣泽贾晓通
Owner GUILIN UNIVERSITY OF TECHNOLOGY