An ultrathin surface-nitrided porous titanium sheet as a current collector-free sulfur host for high-gravimetric-capacity lithium-sulfur batteries.

A novel cathode structure consisting of ultrathin and freestanding surface-nitrided porous titanium (SNPT) sheets, was designed for high-gravimetric-capacity Li-S batteries. This unusual cathode combines the sulfur host and the current collector together, increasing the sulfur mass ratio by over 20% compared with routine cathodes, resulting in excellent cycling performance with an initial capacity of 1325 mA h g-1 and a coulombic efficiency of over 99% at 1.0C.

Carbon Nanotube@RuO2 as a High Performance Catalyst for Li-CO2 Batteries.

Efficient electrocatalysts for Li2CO3 decomposition play an important role in Li-CO2 batteries. In this paper, carbon nanotubes (CNTs) decorated with RuO2 is firstly introduced as cathode materials for Li-CO2 batteries. The CNT@RuO2 composite can not only deliver a high specific capacity but also a lower charge voltage. With the CNT@RuO2 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-1 with a capacity limit of 500 mAh·g-1 can be fully lowered under 4.0 V. Particularly, the CNT@RuO2 cathode can realize most decomposition of prefilled Li2CO3 and show a platform at around 3.9 V. This catalytic activity toward both in situ formed and preloaded Li2CO3 is more feasible for practical application in complex environment.