Open AccessEffects of aluminium and sodium co‐doping on the structural and electrochemical performances of the spinel LiMn 2 O 4 cathode materials
Author(s) -
Li Yuzhu,
Mao Yanfang,
Zhan Taotao,
Li Chao,
Xiao Shunhua
Publication year - 2016
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2016.0037
Subject(s) - spinel , crystallinity , materials science , electrochemistry , aluminium , lithium (medication) , scanning electron microscope , doping , cathode , inorganic chemistry , lithium ion battery , lithium battery , sodium , chemical engineering , battery (electricity) , metallurgy , composite material , ion , chemistry , electrode , organic chemistry , medicine , power (physics) , physics , optoelectronics , quantum mechanics , ionic bonding , engineering , endocrinology
The lithium‐ion battery cathode materials spinel LiMn 2 O 4 , LiAl 0.1 Mn 1.9 O 4 and Li 0.94 Na 0.06 Al 0.1 Mn 1.9 O 4 materials are synthesised by sol–gel method. The structure, morphology and electrochemical performances of the aluminium and sodium co‐doped materials are studied by X‐ray diffraction measurement, scanning electron microscopy, and Electron diffraction spectroscopy, respectively. The results reveal that appropriate amount doping of aluminium and sodium does not change the spinel structure of LiMn 2 O 4 . Those materials have a good crystallinity and the sizes are approximately 150 nm. The initial discharge capacity of Li 0.94 Na 0.06 Al 0.1 Mn 1.9 O 4 is 113.8 mAh/g at 0.5 C. Compared with the rate capability of LiMn 2 O 4 , the discharge capacity of 107.5 mAh/g at 5 C for Li 0.94 Na 0.06 Al 0.1 Mn 1.9 O 4 has 46.8% improvement. Obviously, aluminium and sodium co‐doping is a very effective way to improve LiMn 2 O 4 rate capability.