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Issue 20, 2016
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Tailoring atomic distribution in micron-sized and spherical Li-rich layered oxides as cathode materials for advanced lithium-ion batteries

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Abstract

Li-rich layered oxides with large capacity are considered as one of the most promising cathode materials for the next generation lithium-ion batteries (LIBs). However, Li-rich layered oxides usually deliver unsatisfactory volumetric energy density, poor cycle life and inferior thermal stability. Here, a concentration-gradient doping strategy is introduced for the first time to meet the above challenges. Surprisingly, the atomic distribution in micron-sized and spherical Li-rich layered oxides is tailored after concentration-gradient PO43− polyanion doping, in which Ni and Co atoms decrease continually and Mn atoms increase gradually from the center to the surface in a single particle. As expected, the concentration-gradient PO43− doped oxides exhibit a high initial volumetric energy density of 2027 W h L−1, long cycle life with a capacity retention of 88.2% within 400 cycles, and enhanced thermal stability. These improved performances are believed to be attributed to the formation of the stable Mn-rich and PO43−-rich shell layer, which is beneficial to mitigate the interreaction between Ni4+/Co4+ and the electrolyte in the highly delithiated state and suppress the aggregation of primary grains during cycles. These results demonstrate the feasibility of manipulating atomic distribution by the innovative concentration-gradient doping means, which also provides new insights into desired cathode for LIBs.

Graphical abstract: Tailoring atomic distribution in micron-sized and spherical Li-rich layered oxides as cathode materials for advanced lithium-ion batteries

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Supplementary files

Article information


Submitted
03 Mar 2016
Accepted
08 Apr 2016
First published
11 Apr 2016

J. Mater. Chem. A, 2016,4, 7689-7699
Article type
Paper

Tailoring atomic distribution in micron-sized and spherical Li-rich layered oxides as cathode materials for advanced lithium-ion batteries

P. Hou, G. Li and X. Gao, J. Mater. Chem. A, 2016, 4, 7689
DOI: 10.1039/C6TA01878E

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