期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 14, 页码 5782-5788出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00418h
关键词
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资金
- Ministry of Science and Technology of China [2015CB251103]
- National Natural Science Foundation of China [21773091]
- Graduate Innovation Fund of Jilin University [2017006]
Li+/Mg2+ hybrid-ion batteries (LMIBs) have attracted intensive attention because they can circumvent some serious drawbacks of Li- and Mg-rechargeable batteries. In this work, a novel LMIB was proposed that uses a VS2 nanosheet-based cathode and an all-phenyl complex + LiCl/tetrahydrofuran hybrid electrolyte. Combined spectroscopic analysis and theoretical simulations revealed that (phenyl)(2)Mg and tetrahydrofuran inserted into the nanosheets at an early battery-cycling stage. The interlayer spacing of VS2 was expanded from 5.78 to 8.76 angstrom by the inserted organic species, which significantly reduced the diffusion barrier of Li+. As a result, the LMIBs showed remarkable battery performance with a large discharge capacity (181 mA h g(-1) at 50 mA g(-1)), high rate capability (93 mA h g(-1) at 5 A g(-1)), and long cycle stability (0.04% capacity fading per cycle in 500 cycles).
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