[23p-B102-1~8] 8.3 Plasma nanotechnology

△ [23p-B102-4] Optimal structure of Si nanoparticles as anode of Li-ion all solid-state batteries for simultaneous attainment of high capacity and high cyclability

〇Takeo Hiraoka¹, Makoto Kambara^1,2, Ryoshi Ohta^1,2, Toshimi Tanaka³, Akira Takeuchi³, Masashi Dougakiuchi⁴, Kenichi Fukuda⁴ (1.Tokyo Univ., 2.Osaka Univ., 3.Takeuchi Electric Co.,Ltd., 4.Shimane Industrial Technology Inst.)

Keywords:all solid-state batteries, plasma spray

Si nanoparticles of different sizes and independently controlled oxygen content were formed by a plasma spray method, and their effects on the properties of sulfide-based bulk all-solid-state batteries were investigated. The battery characteristics showed that the capacity decrease during cycling was remarkable when the size exceeded a certain level, and the oxygen content was found to have the potential to improve the cycle stability as a good Li path if the oxygen content was controlled to an appropriate level. On the other hand, not only the oxidation degree but also the Si-O bond structure on the particle surface has a significant effect on Li diffusion.