P. Arora et al., ELECTROCHEMICAL INVESTIGATIONS OF COBALT-DOPED LIMN2O4 AS CATHODE MATERIAL FOR LITHIUM-ION BATTERIES, Journal of the Electrochemical Society, 145(3), 1998, pp. 807-815
Citations number
26
Categorie Soggetti
Electrochemistry,"Materials Science, Coatings & Films
A wide range (y = 0.05-0.33) of Go-doped LiCoyMn2-yO4 spinels were syn
thesized and electrochemically character ized. These Go-doped spinels
showed improved specific capacity and capacity retention over pure spi
nels. Electrochemical impedance spectroscopy and the linear polarizati
on resistance technique were used to determine the transport and elect
rochemical kinetic parameters of Go-doped spinels. The presence of Co
in the spinel inhibits the passivation process occurring on the surfac
e of the cathode. Also, Co increases the exchange current density and
facilitates the charge-transfer reaction of the active material. The l
ower self-discharge observed for Go-doped spinels was attributed to th
eir low surface areas. The cumulative capacity loss estimated for a pu
re spinel resulting from self-discharge in the first 30 h was 3 and 6
times larger than those estimated for Go-doped spinels with y = 0.05 a
nd y = 0.16 in LiCoyMn2-yO4, respectively.