TY - GEN
T1 - Surface modification of spinel LiMn 2O 4 with Y 2O 3 for lithium-ion battery
AU - Bai, Ying
AU - Wu, Feng
AU - Yang, Hua Tong
AU - Zhong, Yu
AU - Wu, Chuan
PY - 2012
Y1 - 2012
N2 - Spinel LiMn 2O 4 was modified with Y 2O 3 coating by a chemical process. The crystal structures of the as-prepared samples were investigated by X-ray diffraction (XRD). The charge/discharge characteristics of the modified samples were evaluated at different rates between 3.0 and 4.4V. The discharge capacities of 2.0 wt.% Y 2O 3-coated LiMn 2O 4 are 116 mAh·g -1, 99.7mAh·g -1, 93.3mAh·g -1 and 82.9mAh·g -1 at 0.1C, 0.5C, 1C and 2C rates (at 20°C). The cycle abilities improvement of the spinel LiMn 2O 4 coated with Y 2O 3 are demonstrated at elevated temperature (55°C) and high rates (2C). From the analysis of electrochemical impedance spectroscopy (EIS), the improvement of cycle ability may be attributed to the suppression on the formation of the passivating films and the reduction of Mn dissolution, which result from the surface modification with Y 2O 3.
AB - Spinel LiMn 2O 4 was modified with Y 2O 3 coating by a chemical process. The crystal structures of the as-prepared samples were investigated by X-ray diffraction (XRD). The charge/discharge characteristics of the modified samples were evaluated at different rates between 3.0 and 4.4V. The discharge capacities of 2.0 wt.% Y 2O 3-coated LiMn 2O 4 are 116 mAh·g -1, 99.7mAh·g -1, 93.3mAh·g -1 and 82.9mAh·g -1 at 0.1C, 0.5C, 1C and 2C rates (at 20°C). The cycle abilities improvement of the spinel LiMn 2O 4 coated with Y 2O 3 are demonstrated at elevated temperature (55°C) and high rates (2C). From the analysis of electrochemical impedance spectroscopy (EIS), the improvement of cycle ability may be attributed to the suppression on the formation of the passivating films and the reduction of Mn dissolution, which result from the surface modification with Y 2O 3.
KW - Coating
KW - Lithium ion battery
KW - Spinel LiMn O
KW - Surface modification
KW - Y O
UR - http://www.scopus.com/inward/record.url?scp=84455199985&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.391-392.1069
DO - 10.4028/www.scientific.net/AMR.391-392.1069
M3 - Conference contribution
AN - SCOPUS:84455199985
SN - 9783037853337
T3 - Advanced Materials Research
SP - 1069
EP - 1074
BT - Chemical Engineering and Material Properties
T2 - 2011 International Symposium on Chemical Engineering and Material Properties, ISCEMP 2011
Y2 - 4 November 2011 through 6 November 2011
ER -
