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Mechanochemical Synthesis and Electrochemical Properties of LiMn 2 O 4
Author(s) -
Choi HeonJin,
Lee KiMin,
Kim GyeungHo,
Lee JuneGunn
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00642.x
Subject(s) - nanocrystalline material , spinel , materials science , electrochemistry , lithium (medication) , chemical engineering , intercalation (chemistry) , cathode , mineralogy , inorganic chemistry , nanotechnology , metallurgy , chemistry , electrode , medicine , endocrinology , engineering
Spinel LiMn 2 O 4 as a cathode material for lithium secondary batteries has been synthesized by a mechanochemical process, and its electrochemical properties have been characterized. Highly disordered nanocrystalline LiMn 2 O 4 powders have been prepared by the mechanochemical processing of Li 2 O and MnO 2 powder mixtures for 24 h. Electrochemical characterization of mechanochemically processed powder has shown that the intercalation of Li + takes place with an initial capacity of 167 mA·h/g in the 2.5–4.3 V range and has better capacity retention as compared to the well‐ordered crystalline LiMn 2 O 4 powders. The better capacity retention of the mechanochemically processed LiMn 2 O 4 powder may be attributed to the highly disordered structure that could accommodate the Jahn–Teller distortion of the spinel structure during Li + intercalation around the 3 V region.