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Reduction of Manganese Dioxide by Dissolved Lithium in Liquid Ammonia for Li–Mn‐O Spinels
Author(s) -
Xu Minwei,
Zhang Yin,
Que Wenxiu,
Song Xiaoping,
Zhou Chao,
Yang Sen
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600293
Subject(s) - spinel , manganese , ammonia , lithium (medication) , inorganic chemistry , cathode , annealing (glass) , chemistry , materials science , metallurgy , medicine , organic chemistry , endocrinology
Spinel‐structured Li‐Mn−O compounds are considered as alternative cathode materials for high‐power lithium ion batteries, which are the ideal power source for the electric vehicles in the near future. However, synthesizing Li‐Mn−O spinels with good cycle performance is a difficult task. In this work, the lithium‐ammonia solution is used to perform the reduction of manganese dioxide (MnO 2 ), which demonstrates a new reaction process for preparing Li‐Mn−O spinels. The whole processes for the formation of Li‐Mn−O spinels are proposed and the Li 1.12 Mn 1.88 O 4 spinel, as an example, is easily achieved via a simple annealing process. Galvanostatic charge/discharge results indicate that the resulting Li 1.12 Mn 1.88 O 4 spinel exhibits both of high capacity (∼105 mAhg −1 at 1C) and good cycling stability (500 cycles), even at the elevated temperature (∼55 °C). The present reaction conditions are interesting, especially, for preparing Li‐contained compounds, which can be extended for other cathode materials.