All-solid-state rechargeable lithium batteries with Li2S as a positive electrode material

✍ Scribed by Akitoshi Hayashi; Ryoji Ohtsubo; Takamasa Ohtomo; Fuminori Mizuno; Masahiro Tatsumisago

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 556 KB
• Volume: 183
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2008.05.031

✦ Synopsis

The Li 2 S-Cu composite electrode materials were prepared by mechanical milling and applied to all-solidstate lithium cells using the Li 2 S-P 2 S 5 glass-ceramic electrolyte. The addition of Cu and the mechanical activation improved the electrochemical performance of Li 2 S in all-solid-state cells. The In/Li 2 S-Cu cells were charged and then discharged at room temperature, suggesting that Li 2 S was utilized as a lithium source. The cells exhibited high discharge capacity of about 490 mAh g -1 at the 1st cycle. The SEM and EDX analyses suggested that the amorphous Li x CuS domain was partially formed by milling, and the domain played an important role in the improvement of capacity. The electrochemical reaction mechanism of the Li 2 S-Cu composites was discussed on the basis of the mechanism of the S-Cu composite electrode.