1 research outputs found
Hybrid Nano-Phase Ion/Electron Dual Pathways of Nickel/Cobalt–Boride Cathodes Boosting Intercalation Kinetics for Alkaline Batteries
Nickel-based
hydroxides and their derivatives exhibit
relatively
low capacities and unsatisfactory durability as cathode materials
for rechargeable alkaline batteries. In this work, a hybrid NiCo–B
nanosheet cathode, integrating electrolyte ion-shuttling channels
and electron-transferring networks into a metal–organic framework
(MOF), was devised delicately. In the structure, the hybrid ion/electron
dual pathways were constructed by NiCo-MOF frameworks and NiCo–B
interpenetration networks. It revealed that nano-phase electron-transferring
pathways in the MOF obviously boosted ion intercalation kinetics.
The as-obtained hybrid NiCo–B nanosheets as cathode materials
exhibited reversible capacity as high as 280 mA h g–1 at a current density of 1 A g–1 and excellent
rate capability with a capacity retention of 78% from 1 to 10 A g–1. After 2000 charge/discharge cycles at 4 A g–1, the capacity still remained at 94% of the initial
one. A full battery assembled with a hybrid NiCo–B cathode
and a Fe2O3 anode showed a high capacity of
250 mA h g–1 and a considerable stability of 89%
after 1000 cycles. Ragone plots indicated the highest energy density
of 409 W h kg–1 and the lowest power density of
1.5 kW kg–1, outperforming other aqueous batteries.
It revealed that a syngenetic structure of ion/electron hybrid dual
pathways integrated into an MOF could be a potential strategy to optimize
ion intercalation electrode materials for alkaline batteries