Carbon-Free
CoO Mesoporous Nanowire Array Cathode
for High-Performance Aprotic Li–O<sub>2</sub> Batteries
Baoshan Wu
Hongzhang Zhang
Wei Zhou
Meiri Wang
Xianfeng Li
Huamin Zhang
10.1021/acsami.5b07003.s001
https://acs.figshare.com/articles/journal_contribution/Carbon_Free_CoO_Mesoporous_Nanowire_Array_Cathode_for_High_Performance_Aprotic_Li_O_sub_2_sub_Batteries/2119102
Although
various kinds of catalysts have been developed for aprotic
Li–O<sub>2</sub> battery application, the carbon-based cathodes
are still vulnerable to attacks from the discharge intermediates or
products, as well as the accompanying electrolyte decomposition. To
ameliorate this problem, the free-standing and carbon-free CoO nanowire
array cathode was purposely designed for Li–O<sub>2</sub> batteries.
The single CoO nanowire formed as a special mesoporous structure,
owing even comparable specific surface area and pore volume to the
typical Super-P carbon particles. In addition to the highly selective
oxygen reduction/evolution reactions catalytic activity of CoO cathodes,
both excellent discharge specific capacity and cycling efficiency
of Li–O<sub>2</sub> batteries were obtained, with 4888 mAh
g<sub>CoO</sub><sup>–1</sup> and 50 cycles during 500 h period.
Owing to the synergistic effect between elaborate porous structure
and selective intermediate absorption on CoO crystal, a unique bimodal
growth phenomenon of discharge products was occasionally observed,
which further offers a novel mechanism to control the formation/decomposition
morphology of discharge products in nanoscale. This research work
is believed to shed light on the future development of high-performance
aprotic Li–O<sub>2</sub> batteries.
2015-10-21 00:00:00
cathode
discharge products
500 h period
bimodal growth phenomenon
nanowire
Li
batterie
aprotic
CoO