Journal
ELECTROCHIMICA ACTA
Volume 263, Issue -, Pages 168-175Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.01.067
Keywords
Hybrid Mg2+/Li+ battery; Mg anode; Electrochemical conversion reaction; Copper sulfide
Categories
Funding
- National Natural Science Foundation of China [21403305, 51402113]
- Hubei Major Projects of Technological Innovation [2017AAA131]
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Hybrid Mg2+/Li+ batteries featuring dendrite-free Mg anode and Li-storage cathode are promising safe energy storage systems. However, improving the energy density remains a grand challenge due to the quite limited capacities of traditional Li-intercalation cathodes. To circumvent this limitation, a new type of conversion cathode for hybrid Mg2+/Li+ batteries, microflower-like Cu9S5, is reported herein. The Cu9S5 cathode is compatible with the dual-salt Mg2+/Li+ electrolyte, and delivers a high reversible capacity of 300 mAh g(-1) at 50 mA g(-1) via electrochemical conversion reaction, with 94% capacity retention over 100 cycles in hybrid Mg2+/Li+ batteries. The electrode also shows an outstanding rate capability providing 155 mAh g(-1) at 1000 mA g(-1) and a superior long-term cycleability over 1000 cycles. This excellent performance is attributed to the hierarchical architecture of Cu9S5 which facilitates the reversible conversion reactions and stabilizes the electrode structure during discharge/charge process. This work provides new insight for the nanostructure design of stable conversion electrodes, and opens a new avenue for building safe and high-performance hybrid Mg2+/Li+ batteries for practical applications. (C) 2018 Elsevier Ltd. All rights reserved.
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