Chinese Academy of Sciences

Hubei Wanrun New Energy Technology Development Co. Ltd

Yonggao Xia

Zhaoping Liu

Bao Qiu

Yaletu Saixi

A lithium-rich manganese-based positive electrode material represented by formula (I). In an X-ray diffraction pattern of the lithium-rich manganese-based positive electrode material, a ratio of a diffraction peak intensity of a Bragg angle near 18.7&#xb0; to a diffraction peak intensity of a Bragg angle near 44.6&#xb0; is 1.10 to 1.24. A method for preparing the lithium-rich manganese-based positive electrode material comprises: mixing a lithium-rich manganese-based compound with a lithium remover; and under the effect of the lithium remover, removing part of LiO from LiMnOin the lithium-rich manganese-based compound, so as to obtain the lithium-rich manganese-based positive electrode material. Due to the reduction of the irreversible product LiO, the initial coulombic efficiency is improved; because of existence of lithium vacancy and oxygen vacancy, the lithium-rich manganese-based positive electrode material has good rate performance and cycle performance.()LiMnOMnO(1&#x2212;)Li(MM')O&#x2003;&#x2003;(I)

Lithium-rich manganese-based positive electrode material and preparation method therefor

Provided is a positive electrode material for a lithium battery with an atomic ratio expressed by the formula (I) Li(MMn)(OZ) for 0.8&#x2264;a&#x2264;1.2, 0&#x2264;x&#x2264;1 and 0&#x2264;y&#x2264;1 in which M is one or more of Li, Na, K, Ca, Mg, Al, Ti, Sc, Ge, V, Cr, Zr, Co, Ni, Zn, Cu, La, Ce, Mn, Hf, Nb, Ta, Mo, W, Ru, Ag, Sn, Pb and Si and Z is one or more of OH, halogens, N, P, S and O, and the primary particles of the positive electrode material have a spheroidal topography. The adjacent (111) family planes of the primary particles are connected by curved surfaces without obvious edges. A preparing method of a positive electrode material for a lithium battery and a lithium battery are also provided. The positive electrode material of the present invention provides a good high-temperature cycling performance and filling capability.

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Zhejiang, China

Yonggao Xia