Journal
ADVANCED MATERIALS
Volume 32, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905524
Keywords
cathode materials; copper sulfide; interlayer expansion; magnesium batteries; non-corrosive electrolyte
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Funding
- National Natural Science Foundation of China [51674147]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [16KJA430001]
- Natural Science Foundation of Jiangsu Province [BK20161544]
- QingLan Project of Jiangsu Province
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Postgraduate Research and Practice Innovation Program of Jiangsu Province
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Rechargeable magnesium batteries (RMB) have been regarded as an alternative to lithium-based batteries because of their abundant elemental resource, high theoretical volumetric capacity, and multi-electron redox reaction without the dendrite formation of magnesium metal anode. However, their development is impeded by their poor electrode/electrolyte compatibility and the strong Coulombic effect of the multivalent Mg2+ ions in cathode materials. Herein, copper sulfide material is developed as a high-energy cathode for RMBs with a non-corrosive Mg-ion electrolyte. Given the benefit of its optimized interlayer structure, good compatibility with the electrolyte, and enhanced surface area, the as-prepared copper sulfide cathode exhibits unprecedented electrochemical Mg-ion storage properties, with the highest specific capacity of 477 mAh g(-1) and gravimetric energy density of 415 Wh kg(-1) at 50 mA g(-1), among the reported cathode materials of metal oxides, metal chalcogenides, and polyanion-type compounds for RMBs. Notably, an impressive long-term cycling performance with a stable capacity of 111 mAh g(-1) at 1 C (560 mA g(-1)) is achieved over 1000 cycles. The results of the present study offer an avenue for designing high-performance cathode materials for RMBs and other multivalent batteries.
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