Abstract
Coating the Li-rich layered oxide cathode Li1.2Ni0.13Co0.13Mn0.54O2 with small amount of conductive carbon is realized by low-temperature sucrose carbonization in air. Carbon coating gives rise to a small amount of Mn3+ on the surface of the Li1.2Ni0.13Co0.13Mn0.54O2. The 1.2 wt% carbon-coated Li1.2Ni0.13Co0.13Mn0.54O2 shows obviously enhanced electrochemical performances, especially in improving rate capability and suppressing the voltage fading during long-term and high-rate cycling. According to the analysis from cyclic voltammetry (CV) and electrochemical impedance spectra (EIS), the improvements on the electrochemical performances are mainly because the coated carbon layer can function by not only increasing the electronic conductivity at the interface with electrolyte but also improving bulk electronic and ionic conductivity by small amounts of Mn3+. Therefore, carbon coating is a promising approach to improve the cyclic stability of the Li-rich layered oxides.
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This study was supported by National Science Foundation of China (grant nos. 21006033 and 51372060) and the Fundamental Research Funds for the Central Universities (2013HGCH0002).
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Chen, J.J., Li, Z.D., Xiang, H.F. et al. Bifunctional effects of carbon coating on high-capacity Li1.2Ni0.13Co0.13Mn0.54O2 cathode for lithium-ion batteries. J Solid State Electrochem 19, 1027–1035 (2015). https://doi.org/10.1007/s10008-014-2707-5
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DOI: https://doi.org/10.1007/s10008-014-2707-5