材料科学
电解质
阴极
电化学
硫化物
重量分析
铜
镁
化学工程
硫化铜
阳极
无机化学
法拉第效率
电极
冶金
化学
物理化学
有机化学
工程类
作者
Yin-Lin Shen,Yujia Wang,Yingchun Miao,Meng Yang,Xiao-Jun Huang,Xiaodong Shen
标识
DOI:10.1002/adma.201905524
摘要
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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