Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7745881 | Solid State Ionics | 2014 | 4 Pages |
Abstract
To compensate the large irreversible capacity (Qirr), lithium was pre-doped to Si thin flakes (Si Leaf Powder® (Si-LP), thickness: 100 nm) for different times, and its effects on the charge/discharge characteristics such as reversible capacity, cycleability, and rate-capability were investigated in detail. The charge/discharge test results showed that a large initial Qirr of ca. 2300 mAh gâ 1 for the Si-LP can be completely compensated by Li pre-doping, and a high capacity (> 2500 mAh gâ 1) was obtained for pre-doped Si-LPs. The pre-doping did not cause any harmful effects on cycleability as long as lithium was uniformly pre-doped. The addition of vinylene carbonate to the electrolyte solution in the pre-doping and in the test cell greatly improved the cycleability, and a high discharge capacity of ca. 2300 mAh gâ 1 was kept after 40 cycles.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Takashi Okubo, Morihiro Saito, Chihiro Yodoya, Akika Kamei, Masato Hirota, Toshio Takenaka, Toyoki Okumura, Akimasa Tasaka, Minoru Inaba,