期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 10, 页码 5760-5768出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta12497c
关键词
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资金
- National Natural Science Foundation of China [51274029, 51574019, 51774037]
- State Key Laboratory of Advanced Metallurgy Foundation of China [41602014]
- China Postdoctoral Science Foundation [2016M600013]
Rechargeable potassium-ion batteries (KIBs) have emerged as promising alternatives to lithium-ion batteries (LIBs) in large-scale applications due to the abundant and low-cost potassium resources. To date, only a few suitable potassium storage materials have been reported due to the large-sized potassium ions and sluggish kinetics. Herein, we design a three-layered heterostructure with porous metallic TiNb2O6 as the core and carbon-encapsulated MoS2 nanosheets as the shell (denoted as TiNb2O6@MoS2/C) as an advanced anode for KIBs. This hybrid configuration can significantly enhance the electronic conductivity from the interior to the exterior by virtue of the oxygen-atom-unsaturated metallic TiNb2O6 core. Furthermore, the amorphous carbon shell plays a crucial role to inhibit the particle agglomeration, accommodate the volume expansion and protect the active material from pulverization because of the three-layered heterostructure. As a result, impressive electrochemical behavior with high capacity (424mA h g(-1) at 0.1 A g(-1) after 50 cycles) and high cycling stability (175 mA h g(-1) at 1.0 A g(-1) after 300 cycles) is achieved. This work opens the door for designing highly conductive heterostructures for energy storage devices.
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