The
fast capacity decay of existing anode materials at a high rate
is a thorny problem that hinders the thriving development of sodium
ion batteries (SIBs). Herein, we present a unique anode material constructed
via cuprous sulfide hollow nanospheres (CuS HNs), which can achieve
ultrafast sodiation-desodiation at high rate (20 A g–1) and stable cycling 2000 times without obvious capacity degradation
(250.1 mAh g–1, capacity retention of 93%). As far
as we know, this excellent rate performance is superior to most of
the other currently known metal oxides/sulfides anode materials for
SIBs. It is believed that the contribution for high-rate sodium storage
of CuS HNs mainly comes from the synergistic effect between hollow
nanosphere structure and surface pseudocapacitive behavior. The open
hollow nanostructure allows the pseudocapacitive storage simultaneously
on the inner and outer surfaces of the nanospheres. Meanwhile, the
pseudocapacitive behavior can relieve the large stress of nanospheres
at high rate and retain the structural stability of electrode materials.
The feature of ultralfast charging and discharging of CuS HNs without
obvious capacity sacrifice would be expected to provide a strong boost
for the large-scale application of SIBs.
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