Journal
NANO LETTERS
Volume 19, Issue 9, Pages 6665-6672Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b02963
Keywords
Rechargeable Mg batteries; cathode materials; high energy density; displacement reaction; CuS
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Funding
- Army Research Office [W911NF-15-1-0187]
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
- National Natural Science Foundation of China [21905299]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2016B120]
- China Scholarship Council [201606130050]
- China Postdoctoral Science Foundation [2019TQ0346]
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Because 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 similar to 400 mA h/g in a MACC electrolyte, corresponding to the gravimetric and volumetric energy density of 608 W h/kg and 1042 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.
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