Details

Autor(en) / Beteiligte

• Dong, Wujie
• Xu, Jijian
• Wang, Chao
• Lu, Yue
• Liu, Xiangye
• Wang, Xin
• Yuan, Xiaotao
• Wang, Zhe
• Lin, Tianquan
• Sui, Manling
• Chen, I‐Wei
• Huang, Fuqiang

Titel

A Robust and Conductive Black Tin Oxide Nanostructure Makes Efficient Lithium‐Ion Batteries Possible

Ist Teil von

• Advanced materials (Weinheim), 2017-06, Vol.29 (24), p.n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• SnO2‐based lithium‐ion batteries have low cost and high energy density, but their capacity fades rapidly during lithiation/delithiation due to phase aggregation and cracking. These problems can be mitigated by using highly conducting black SnO2−x, which homogenizes the redox reactions and stabilizes fine, fracture‐resistant Sn precipitates in the Li2O matrix. Such fine Sn precipitates and their ample contact with Li2O proliferate the reversible Sn → Li xSn → Sn → SnO2/SnO2−x cycle during charging/discharging. SnO2−x electrode has a reversible capacity of 1340 mAh g−1 and retains 590 mAh g−1 after 100 cycles. The addition of highly conductive, well‐dispersed reduced graphene oxide further stabilizes and improves its performance, allowing 950 mAh g−1 remaining after 100 cycles at 0.2 A g−1 with 700 mAh g−1 at 2.0 A g−1. Conductivity‐directed microstructure development may offer a new approach to form advanced electrodes. Changing oxide conductivity alone suffices for improving the lithiation/delithiation reversibility of tin‐oxide lithium‐ion batteries. The use of highly conductive black SnO2−x initiates homogeneous microstructure evolutions, forming very fine Sn particles inside the Li2O to sustain reversible Sn redox, thus delivering durable capacitance. The addition of highly conducting, well‐dispersed reduced graphene oxide further improves the cycling performance.