Аннотация:
CuS is a metal sulfide anode material used in constructing lithium ion batteries (LIBs)
with great promise. However, its practical application is limited by rapid capacity decline,
poor cycling, and rate performance. In this work, the CuS nanowire-on-nanoplate network is
synthesized through an improved dealloying method under two contrasting reaction temperatures.
When used as an LIB anode, the as-obtained CuS network exhibits superior cycling performance
(420 mAh·g
−1
retained after 100 cycles at 0.2 C). When at 3 C, it still delivers a capacity of around
350 mAh·g
−1
. The improved electrochemical performances of the CuS anode should be attributed to
the well-designed nanowire-on-nanoplate network structure in which the introduction of nanowires
improves Li storage sites, shortens Li-ion diffusion distance, enhances the conductivity of active
materials, and offers multiscale spaces for buffering the volume variation. The fabrication route
adopted in this paper has an important significance for developing the dealloying technique and
designing more suitable anode structures for LIBs.