najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2018-9-6-775-782najo-860Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХAnionic redox effect on the electrochemical performance of LLNMC–CeO2–C nanocompositesKurilenkoK. A.

119991 Moscow

PetukhovD. I.

119991 Moscow

di.petukhov@gmail.comGarshevA. V.

119991 Moscow

ShlyakhtinO. A.

119991 Moscow

Department of Chemistry, M.V. Lomonosov Moscow State UniversityRussian FederationDepartment of Chemistry, M.V. Lomonosov Moscow State University; Department of Materials Sciences, M.V. Lomonosov Moscow State UniversityRussian Federation20181408202596775–782Copyright © Kurilenko K.A., Petukhov D.I., Garshev A.V., Shlyakhtin O.A., 20252025Kurilenko K.A., Petukhov D.I., Garshev A.V., Shlyakhtin O.A.Kurilenko K.A., Petukhov D.I., Garshev A.V., Shlyakhtin O.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/860

Li[Li0.13Ni0.2Mn0.47Co0.2]O2–CeO2 composites have been obtained by coprecipitation with CeO2 and by coating with ceria followed by coating with carbon film. STEM analysis revealed the formation of 20 – 30 nm ceria particles on the surface of LLNMC grains in all cases. Both carbon-coated LLNMC-CeO2 composites and carbon-free LLNMC coated with 1 % CeO2 demonstrated enhanced capacity values that could not be explained by the charge compensation via redox of nickel and cobalt. 5 % CeO2-coprecipitated sample demonstrated the most intense anomaly in CV at U = 4.1 – 4.5 V associated with redox processes in the anionic sublattice of LLNMC and a larger charge transfer resistance compared to other composites. The maximum values of Li+ diffusion coefficient have been observed for the samples coated with 1 % CeO2. The different electrochemical behavior of these samples could be explained by the different intensity of anionic redox processes in the samples with different amount of nanocrystalline ceria.

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The authors declare that there are no conflicts of interest present.