Carbon Nanotube@RuO as a High Performance Catalyst for Li-CO Batteries.

Efficient electrocatalysts for LiCO decomposition play an important role in Li-CO batteries. In this paper, carbon nanotubes (CNTs) decorated with RuO is firstly introduced as cathode materials for Li-CO batteries. The CNT@RuO composite can not only deliver a high specific capacity but also a lower charge voltage. With the CNT@RuO cathodes, the Coulombic efficiency still remains around 100% until the 15th cycle. The charge voltage of early 30 cycles at a current of 50 mA·g with a capacity limit of 500 mAh·g can be fully lowered under 4.0 V. Particularly, the CNT@RuO cathode can realize most decomposition of prefilled LiCO and show a platform at around 3.9 V. This catalytic activity toward both in situ formed and preloaded LiCO is more feasible for practical application in complex environment.