nl9b02963_si_001.pdf (1.44 MB)
High-Energy-Density Rechargeable Mg Battery Enabled by a Displacement Reaction
journal contribution
posted on 2019-08-26, 14:40 authored by Minglei Mao, Tao Gao, Singyuk Hou, Fei Wang, Ji Chen, Zengxi Wei, Xiulin Fan, Xiao Ji, Jianmin Ma, Chunsheng WangBecause
of its high theoretical volumetric capacity and dendrite-free
stripping/plating of Mg, rechargeable magnesium batteries (RMBs) hold
great promise for high energy density in consumer electronics. However,
the lack of high-energy-density cathodes severely constrains their
practical applications. Herein, for the first time, we report that
a CuS cathode can fully reversibly work through a displacement reaction
in CuS/Mg pouch cells at room temperature and provide a high capacity
of ∼400 mA h/g in a MACC electrolyte, corresponding to the
gravimetric and volumetric energy density of 608 W h/kg and1042 W
h/L, respectively. Even after 80 cycles, CuS/Mg pouch cells can maintain
a high capacity of 335 mA h/g. Detailed mechanistic studies reveal
that CuS undergoes a displacement reaction route rather than a typical
conversion mechanism. This work will provide a guide for more discovery
of high-performance cathode candidates for RMBs.