Electrochemical Characteristics and Phase Composition of Lithium-Manganese Oxide Spinel with Excess Lithium Li_(1 + x)Mn₂O₄

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The paper presents the results of the study of phase composition and electrochemical performance of lithium-manganese oxide spinel with excess lithium of nominal composition of Li_1 + xMn₂O₄ obtained by solid-phase method. It was established that samples with x = 0.1 and 0.2 were composite materials with LiMn₂O₄ being the basic phase and Li₂MnO₃ being the impurity (3 and 7 mas.%, respectively) also comprising trace amounts of MnO₂. The composite material with 3% of Li₂MnO₃ (x = 0.1) retained 80–90% of the initial specific capacity after 300 charge-discharge cycles at C/2, while single-phase stoichiometric spinel LiMn₂O₄ retained less than 70–75%.

Authors:

Zhuravlev Viktor Dmitrievich, Institute of Chemistry of a Solid body UB of RAS, 91, GSP, Pervomayskaya St., Yekaterinburg, 620990, zhvd@ihim.uran.ru

Shchekoldin Sergei Ivanovich, JSC Saturn, 21, p. 1, B. Cherkizovskaya St., Moscow, 107553, sishch7@rambler.ru

Andryushin Stanislav Evgen'evich, JSC Saturn, 21, p. 1, B. Cherkizovskaya St., Moscow, 107553, fenwo@yandex.ru

Sherstobitova Elena Aleksandrovna, Institute of Chemistry of a Solid body UB of RAS, 91, GSP, Pervomayskaya St., Yekaterinburg, 620990, sherl@imp.uran.ru

Nefedova Kseniya Valer'evna, Institute of Chemistry of a Solid body UB of RAS, 91, GSP, Pervomayskaya St., Yekaterinburg, 620990, nefedova@ihim.uran.ru

Bushkova Ol'ga Viktorovna, Institute of high-temperature Electrochemistry UB of RAS, 20, Akademicheskaya St., Yekaterinburg, 620990, ovbushkova@rambler.ru

Key words:

литий-марганцевая шпинель, избыточный литий, твёрдофазный синтез, рентгеновская дифракция, электрохимическое поведение

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Journal issue:

2020. Т. 20, № 3,

DOI:

https://doi.org/10.18500/1608-4039-2020-20-3-157-170

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