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Materials 2018, 11(7), 1162;

Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries

Department of Materials Science, Lomonosov Moscow State University, Leninskie Gory, 1-73, Moscow 119991, Russia
S.U. Umarov Physical and Technical Institute, Academy of Sciences of Republic of Tajikistan, Aini street 299, Dushanbe 734063, Tajikistan
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russia
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31-4 Leninskii Prospect, Moscow 119071, Russia
Author to whom correspondence should be addressed.
Received: 5 June 2018 / Revised: 30 June 2018 / Accepted: 5 July 2018 / Published: 8 July 2018
(This article belongs to the Section Energy Materials)
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A new route for the preparation of nickel and cobalt substituted spinel cathode materials (LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4) by freeze-drying of acetate precursors followed by heat treatment was suggested in the present work. The experimental conditions for the preparation single-phase material with small particle size were optimized. Single-phase spinel was formed by low-temperature annealing at 700 °C. For discharge rate 0.2 C, the reversible capacities 109 and 112 mAh g−1 were obtained for LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4, respectively. A good cycle performance and capacity retention about 90% after 30 cycles at discharge rate 0.2–4 C were observed for the materials cycled from 3 to 4.6 V vs. Li/Li+. Under the same conditions pure LiMn2O4 cathode materials represent a reversible capacity 94 mAh g−1 and a capacity retention about 80%. Two independent experimental techniques (cyclic voltammetry at different scan rates and electrochemical impedance spectroscopy) were used in order to investigate the diffusion kinetics of lithium. This study shows that the partial substitution of Mn in LiMn2O4 with small amounts of Ni and Co allows the cyclability and the performance of LiMn2O4-based cathode materials to be improved. View Full-Text
Keywords: lithium-ion batteries; cathode materials; freeze-drying; LiMn2O4 lithium-ion batteries; cathode materials; freeze-drying; LiMn2O4

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Normakhmedov, O.O.; Brylev, O.A.; Petukhov, D.I.; Kurilenko, K.A.; Kulova, T.L.; Tuseeva, E.K.; Skundin, A.M. Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries. Materials 2018, 11, 1162.

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