Journal
MATERIALS RESEARCH BULLETIN
Volume 130, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.110923
Keywords
Lithium ion battery; Li- and Mn-rich oxide cathode; Cation/polyanion co-doping
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Funding
- National Natural Science Foundation of China [21878195, 21805198, 21805018]
- Distinguished Young Scholars of Sichuan University [2017SCU04A08]
- Huohua Ku project of Sichuan University [2018SCUH0094]
- Research Foundation for the Postdoctoral Program of Sichuan University [2018SCU12045]
- Research Foundation for the Sichuan University [2018CDZG-16]
- Zigong City [2018CDZG-16]
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Li- and Mn-rich layered cathode materials (LMR) have been widely studied for their ultrahigh energy density. Unfortunately, the rapid potential decay and capacity degradation during cycling hinder their commercialization process. In this work, Mg2+ cation and PO43- polyanion dual elements coupling effect induced lattice modification strategy is developed to address these drawbacks for a typical lithium-rich material. The structural characteristic, chemical composition, valence state and elemental distribution of the materials are investigated by scanning electron microscopy, X-ray diffraction, inductively coupled plasma optical emission spectroscopy, focused ion beam and high-resolution transmission electron microscopy, respectively. Mg2+ and PO(4)(3-)co-modified lithium-rich cathode material shows excellent electrochemical properties. It provides an improved initial coulombic efficiency of 87 % and ultrahigh initial discharge capacity of 307 mA h g(-1) during a cut-off voltage of 2.0-4.8 V and a current density of 25 mA g(-1). In conclusion, the Mg2+ and PO(4)(3- )co-modified material exhibits not only significantly improved rate performance (150.7 mA h g(-1)@ 5 C) but also markedly improved cycling stability (83 % @ 1 C @ 300 cycles).
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