Application of the Low-heating Solid-state Reaction Method in Preparation of Multi-metal Oxides Composite -Synthesis, Structure and Electrochemical Properties of Rhombohedral LiMnO2 Cathode Material for Lithium-ion Batteries

Abstract

Abstract: LiMnO₂ compounds with rhombohedral structure were prepared by the low-heating solid-state reaction method at the
temperature range of 350～700℃. The powder X-ray diffraction technique was applied to investigate the structures of the obtained samples.
XRD result shows that the structures of these samples are the same as that of LiCoO₂. Compared with LiCoO₂ and LiCo_0.8Ni_0.2O₂ prepared by
the same method, the lattice parameter of r-LiMnO₂, c/a, is relatively smaller due to the Jahn-Teller deformation. Selected-area electron diffraction
and XRD results indicate the existence of the cubic spinel impurities in the r-LiMnO₂ samples sintered at 600℃ and 700℃. The tests of
charge/discharge show that the samples prepared above 600℃ have two voltage plateaus of 3V and 4V, of which the plateau at 4V is related to the
cubic spinel impurities. Whereas, the samples obtained below 500℃ present only one plateau of 3V. Especially, the sample obtained at 500℃
exhibits good structural stability in lithium-ion intercalation/deintercalation processes.

Key words: rhombohedral LiMnO₂, Low-heating solid-state reaction, lithium-ion batteries

CLC Number:

TM912

TANG Xin-Cun,HE Li-Ping,CHEN Zong-Zhang,JIA Dian-Zeng. Application of the Low-heating Solid-state Reaction Method in Preparation of Multi-metal Oxides Composite -Synthesis, Structure and Electrochemical Properties of Rhombohedral LiMnO₂Cathode Material for Lithium-ion Batteries[J]. Journal of Inorganic Materials.

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Application of the Low-heating Solid-state Reaction Method in Preparation of Multi-metal Oxides Composite -Synthesis, Structure and Electrochemical Properties of Rhombohedral LiMnO₂Cathode Material for Lithium-ion Batteries

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