Modification of Li[Li0.13Ni0.2Mn0.47Co0.2]O2 cathode material by layered CeO2–C coating
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Li[Li0.13Ni0.2Mn0.47Co0.2]O2 (LLNMC) cathode materials coated with CeO2 and pyrolytic carbon have been obtained by the consecutive thermal decomposition of Ce(NO3)3 and polystyrene at the surface of LLNMC powder. EDX analysis combined with transmission electron microscopy revealed the uniform coating of LLNMC grains with nanosized ceria particles. The XPS spectra of LLNMC coated with CeO2 and carbon indicated a considerable amount of –С=С– bonds in the carbonized polystyrene pyrolysis products. The layered CeO2–C coating promotes a decrease in the electrode polarization and the charge transfer resistance of LLNMC during cycling, thus promoting a better rate capability of the cathode material. A combined effect of the CeO2 and carbon coatings results in the increase of the electrochemical capacity of LLNMC to 220 mAh g−1 at C/10.
KeywordsLi-ion batteries Cathode materials Coatings Ceria Pyrolytic carbon
The work is partially supported by the individual grant 16-33-60195 (D.I. Petukhov) of the Russian Foundation for Basic Research. The authors are thankful to the M.V. Lomonosov Moscow State University Program of Development for the partial support of instrumental studies.