富锂锰基正极材料反应机理研究进展

doi:10.19964/j.issn.1006-4990.2022-0056

Abstract

Abstract:

The lithium-rich manganese-based cathode material of xLi₂MnO₃·（1-x）LiMO₂（M=Ni，Co or Mn） has a high specific capacity（≥250 mA·h/g） and the significant advantages of low cost.In recent years，it has also received widespread attention from academia and industry.There are still some controversies about material structure and reaction mechanism.The structure and reaction mechanism of lithium-rich manganese-based materials were summarized and reviewed.Three viewpoints of materials structure were summarized：single-phase solid solution，two-phase mixture，and local cation ordered arrangement.It was concluded that the structure of lithium-rich manganese-based materials was closely related to the element ratio，preparation conditions and so on.The reaction mechanism was focused on the Li⁺/H⁺ exchange theory，anionic oxygen redox（anion charge compensation theory） and Mn⁴⁺/Mn⁷⁺ reaction mechanism hypothesis.The existence of O—O dimer or oxygen hole in the intermediate products of the anionic oxygen redox reaction process was discussed and analyzed.Finally，some thoughts on the future product application direction of this kind of materials were put forward.Mixing with other cathode materials may open the door of industrialization of lithium-rich manganese-based materials，and the industrial application of cost-effective lithium-rich manganese-based materials will promote the development of lithium-ion batteries to a new level.

Key words: lithium-rich manganese-based cathode materials, structure, reaction mechanism

CLC Number:

TQ131.11

YANG Fengyu,DONG Hua,CHEN Botao. Research progress of reaction mechanism of lithium-rich manganese-based cathode materials[J]. Inorganic Chemicals Industry, 2022, 54(12): 19-27.

Figures/Tables 10

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Research progress of reaction mechanism of lithium-rich manganese-based cathode materials

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