A Binder-Free and Free-Standing Cobalt Sulfide@Carbon Nanotube Cathode Material for Aluminum-Ion Batteries

作者：Hu, Yuxiang; Ye, Delai; Luo, Bin; Hu, Han; Zhu, Xiaobo; Wang, Songcan; Li, Linlin; Peng, Shengjie^*; Wang, Lianzhou^*

来源：Advanced Materials, 2018, 30(2): 1703824.

DOI：10.1002/adma.201703824

• aluminum-ion battery
• binder-free
• cobalt sulfide@carbon nanotube composites
• free-standing
• long-term stability

Rechargeable aluminum-ion batteries (AIBs) are considered as a new generation of large-scale energy-storage devices due to their attractive features of abundant aluminum source, high specific capacity, and high energy density. However, AIBs suffer from a lack of suitable cathode materials with desirable capacity and long-term stability, which severely restricts the practical application of AIBs. Herein, a binder-free and self-standing cobalt sulfide encapsulated in carbon nanotubes is reported as a novel cathode material for AIBs. The resultant new electrode material exhibits not only high discharge capacity (315 mA h g(-1) at 100 mA g(-1)) and enhanced rate Performance (154 mA h g(-1) at 1 A g(-1)), but also extraordinary cycling stability (maintains 87 mA h g(-1) after 6000 cycles at 1 A g(-1)). The free-standing feature of the electrode also effectively suppresses the side reactions and material disintegrations in AIBs. The new findings reported here highlight the possibility for designing high-performance cathode materials for scalable and flexible AIBs.

• 出版日期2018-1-11
• 单位南京航空航天大学