Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Enhanced cycling stability of o-LiMnO2 cathode modified by lithium boron oxide coating for lithium-ion batteries
AU - Nagasubramanian, Arun
AU - Yu, Denis Yau Wai
AU - Hoster, Harry
AU - Srinivasan, Madhavi
PY - 2014/7
Y1 - 2014/7
N2 - The effect of lithium boron oxide (LBO) coating on the electrochemical performance of orthorhombic LiMnO2 (o-LiMnO2) cathode for lithium-ion batteries is investigated. o-LiMnO2 synthesized via solid state synthesis technique is modified with LBO addition. The presence of LBO is identified via Fourier transform infrared spectroscopy analysis. o-LiMnO2 is observed to transform to a spinel-like phase during cycling which undergoes capacity fading. Studies indicate that the presence of 1-2 wt% LBO results in an improved capacity and better capacity retention with cycling. The pristine sample reveals a maximum specific capacity of 172 mAhg(-1), whereas the LBO-modified samples display about 189.1 mAhg(-1) in the cycling tests conducted at a rate of 50 mAg(-1) in the voltage range of 2-4.5 V. After 70 cycles, the LBO-modified LiMnO2 displayed higher capacity retention of 175 mAhg(-1) as compared to the pristine sample that exhibited 130 mAhg(-1). By analyzing the charge-discharge behavior, it is observed that the capacity obtained from lithium insertion into the tetrahedral sites of the spinel structure is more or less constant throughout the cycling and that the bulk of the capacity loss is resulting when lithium is inserted into the octahedral sites of the spinel structure. Impedance measurement reveals a reduced charge-transfer resistance for the LBO-modified samples suggesting that the presence of LBO is countering capacity loss arising from insertion of lithium into the octahedral sites thus contributing to the overall cycling stability.
AB - The effect of lithium boron oxide (LBO) coating on the electrochemical performance of orthorhombic LiMnO2 (o-LiMnO2) cathode for lithium-ion batteries is investigated. o-LiMnO2 synthesized via solid state synthesis technique is modified with LBO addition. The presence of LBO is identified via Fourier transform infrared spectroscopy analysis. o-LiMnO2 is observed to transform to a spinel-like phase during cycling which undergoes capacity fading. Studies indicate that the presence of 1-2 wt% LBO results in an improved capacity and better capacity retention with cycling. The pristine sample reveals a maximum specific capacity of 172 mAhg(-1), whereas the LBO-modified samples display about 189.1 mAhg(-1) in the cycling tests conducted at a rate of 50 mAg(-1) in the voltage range of 2-4.5 V. After 70 cycles, the LBO-modified LiMnO2 displayed higher capacity retention of 175 mAhg(-1) as compared to the pristine sample that exhibited 130 mAhg(-1). By analyzing the charge-discharge behavior, it is observed that the capacity obtained from lithium insertion into the tetrahedral sites of the spinel structure is more or less constant throughout the cycling and that the bulk of the capacity loss is resulting when lithium is inserted into the octahedral sites of the spinel structure. Impedance measurement reveals a reduced charge-transfer resistance for the LBO-modified samples suggesting that the presence of LBO is countering capacity loss arising from insertion of lithium into the octahedral sites thus contributing to the overall cycling stability.
KW - Li-ion battery
KW - Cathode material
KW - o-LiMnO2
KW - Surface coating
KW - Lithium boron oxide
KW - Capacity enhancement
KW - ORTHORHOMBIC LIMNO2
KW - ELECTROCHEMICAL PERFORMANCE
KW - MANGANESE OXIDE
KW - SPINEL
KW - TEMPERATURES
KW - 55-DEGREES-C
KW - BEHAVIOR
U2 - 10.1007/s10008-014-2421-3
DO - 10.1007/s10008-014-2421-3
M3 - Journal article
VL - 18
SP - 1915
EP - 1922
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
SN - 1432-8488
IS - 7
ER -