Premium
Preparation of LiMn 2 O 4 powders via spray pyrolysis and fluidized bed hybrid system
Author(s) -
Taniguchi Izumi,
Matsuda Keigo,
Furubayashi Hiroki,
Nakajima Shinya
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10841
Subject(s) - materials science , spinel , crystallinity , chemical engineering , fluidized bed , lithium (medication) , ceramic , cathode , particle size , lithium ion battery , fluidization , particle (ecology) , pyrolysis , manganese , electrochemistry , mineralogy , battery (electricity) , composite material , electrode , metallurgy , chemistry , organic chemistry , medicine , power (physics) , physics , oceanography , quantum mechanics , geology , engineering , endocrinology
Abstract A novel technique has been developed to directly produce fine ceramic powders from liquid solution using a spray pyrolysis and fluidized bed hybrid system. Using this technique, the preparation of lithium manganese oxides LiMn 2 O 4 , which are the most promising cathode materials for lithium‐ion batteries, has been carried out for various superficial gas velocities U 0 = 0.30‐0.91 m/s, static bed heights L s = 50‐150 mm, and medium particle sizes d pm,g = 294‐498 μm. The resulting powders had spherical nanostructured particles that comprised primary particles with a few tens of nanometer in size, and they exhibited a pure cubic spinel structure without any impurities in the XRD patterns. Moreover, the as‐prepared powders showed better crystallinity and smaller specific surface area than those by conventional spray pyrolysis. The effects of process parameters on powder properties, such as specific surface area and crystallinity, were investigated for a wide range of superficial gas velocities and static bed heights. An as‐prepared sample was used as cathode active materials for lithium‐ion batteries and the cell performance has been investigated. Test experiments in the electrochemical cell Li/1M LiClO 4 in PC/LiMn 2 O 4 demonstrated that the sample prepared by the present technique was superior to that by the conventional spray pyrolysis and solid‐state reaction method. © 2006 American Institute of Chemical Engineers AIChE J, 2006