TY - JOUR
T1 - Degradation behavior of electrodes in MH/Ni batteries under conditions of overcharge
AU - Li, Li
AU - Wu, Feng
AU - Yang, Kai
AU - Wang, Jing
AU - Chen, Shi
PY - 2004/8
Y1 - 2004/8
N2 - Effects of overcharging on the electrode material performance of MH/Ni batteries were investigated using SEM, XRD, TEM and EIS methods. The results indicated that the positive materials remained in their original spherical morphology after 70 cycles under normal charge/discharge processes. However, the spherical particles were cracked with the irreversible expansion of crystal lattice under overcharge conditions. Hydrogen storage alloy particles were covered with lots of needle-like corrosive products but without obvious pulverization after cycling. The main components of the needle-like corrosive products were detected to be rare earth hydroxide or oxide by means of EDAX. It was found from EIS analysis that Rs, Rt and Zw increased to some extent, while Ci, decreased. These changes during the overcharge cycling resulted in the degradation behavior of MH/Ni batteries.
AB - Effects of overcharging on the electrode material performance of MH/Ni batteries were investigated using SEM, XRD, TEM and EIS methods. The results indicated that the positive materials remained in their original spherical morphology after 70 cycles under normal charge/discharge processes. However, the spherical particles were cracked with the irreversible expansion of crystal lattice under overcharge conditions. Hydrogen storage alloy particles were covered with lots of needle-like corrosive products but without obvious pulverization after cycling. The main components of the needle-like corrosive products were detected to be rare earth hydroxide or oxide by means of EDAX. It was found from EIS analysis that Rs, Rt and Zw increased to some extent, while Ci, decreased. These changes during the overcharge cycling resulted in the degradation behavior of MH/Ni batteries.
KW - Degradation analysis
KW - Electrodes materials
KW - MH/Ni batteries
KW - Overcharge
UR - http://www.scopus.com/inward/record.url?scp=19744381014&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:19744381014
SN - 1001-0645
VL - 24
SP - 739-742+746
JO - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
JF - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
IS - 8
ER -