[15p-424-1~19] 1.4 Energy conversion, storage, resources and environment

[15p-424-13] Improvement of Cyclability and A Decrease in Internal Resistance with The Delithiation Capacity Limitation for Si Nanopowder Electrode with Si Swarf

〇Taketoshi Matsumoto¹, Katsuya Kimura¹, Hirotomo Nishihara², Takatoshi Kasukabe², Takashi Kyotani², Hikaru Kobayashi¹ (1.ISIR, Osaka Univ., 2.IMRAM, Tohoku Univ.)

Keywords:Li ion battery, Si, swarf

A Si anode is fabricated with Si swarf. In the case of limitation of the 1500 mAh/g delithiation capacity, the cyclability is greatly improved, and the discharge capacity is 1480 mAh/g at the 300th cycle. The overvoltage is also suppressed compared to those in the case of the no limitation of the charge and discharge capacity and limitation of the charge capacity after deep delithiation. This indicates that the good inter-particle contact is achieved by the lithiation and delithiation in the range of high Li concentration in Si nanopowder with less change of Si nanopowder size.