The Effects of Si Addition to the Tin Oxide Thin Films on the Electrochemical Characteristics for Lithium Secondary Microbattery Anode
For lithium secondary microbattery anode, the tin oxide thin films with the various Si additions (0, 2, 6, 10, 20mol%) were prepared on the p-type (100) SiO2/Si substrate by R.F. magnetron sputtering method at the substrate temperature of 300°C under the gas ratio of Ar/O2 (7/3). The effect of Si addition to the SnO2 thin film on the structural change and electrochemical performance and the reversible capacity performance was investigated. As Si addition amounts increased, Si-O bonding density increased and Sn-O bonding density decreased. The addition of optimum Si amount led decrease of Sn oxidation state so that the irreversible capacity was reduced and cycle characteristic was enhanced during the charge-discharge test. SnO2 films with 6mol%Si had the highest reversible capacity of 700mAh/g after 100cycles.
Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee
C. H. Park and Y. G. Son, "The Effects of Si Addition to the Tin Oxide Thin Films on the Electrochemical Characteristics for Lithium Secondary Microbattery Anode", Materials Science Forum, Vols. 510-511, pp. 1130-1133, 2006