Unravelling the Structure and Electrochemical Performance of Li-Cr-Mn-O Cathodes: From Spinel to Layered

ACS Applied Materials & Interfaces
Xuelei LiLianqi Zhang

Abstract

To explore a new series of cathode materials with high electrochemical performance, the spinel-layered (1 - x)[LiCrMnO4]· x[Li2MnO3·LiCrO2] ( x = 0, 0.25, 0.5, 0.75, and 1) composites are synthesized with the sol-gel method. X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, and Raman spectra reveal that the structure of the (1 - x)[LiCrMnO4]· x[Li2MnO3·LiCrO2] cathode materials evolves from spinel to hybrid spinel-layered and layered structures with the increase of the Li concentration. Test results reveal that the structure and electrochemical performance of (1 - x)[LiCrMnO4]· x[Li2MnO3·LiCrO2] ( x = 0.25, 0.5 and 0.75) composites have the characteristics of both spinel ( x = 0) and Li-rich layered phases ( x = 1). In particular, x = 0.5 and 0.75 electrodes exhibit relatively high capacity retention and rate capability, which is mainly ascribed to the synergistic effect of the spinel and Li-rich layered phases, the 3D Li-ion diffusion channels of the spinel phase, and the low charge-transfer resistance ( Rct) and Warburg diffusion impedance ( Wo).

References

Jul 21, 2006·The Journal of Physical Chemistry. B·Hui LiKun-Sheng Hu
Apr 12, 2012·Accounts of Chemical Research·Ying Shirley Meng, M Elena Arroyo-de Dompablo
May 28, 2015·Angewandte Chemie·Hyewon RyooSung-Yoon Chung
Jul 21, 2016·ACS Applied Materials & Interfaces·Ji-Lei ShiLi-Jun Wan
Nov 18, 2017·ACS Applied Materials & Interfaces·Ji-Lei ShiYu-Guo Guo

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Citations

Nov 16, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Shenghua YuanLianqi Zhang

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