Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 1, Pages 1232-1240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14742
Keywords
molybdenum disulfide; expanded (002) planes; hollow porous carbon spheres; yolk-shell structure; potassium-ion batteries
Funding
- Innovation Program of Central South University [2018zzts139]
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Potassium-ion batteries (PIBs) are emerging as promising next-generation electrochemical storage systems for their abundant and low-cost potassium resource. The key point of applying PIBs is to exploit stable K-host materials to accommodate the large-sized potassium ion. In this work, a yolk-shell structured MoS2@hollow porous carbon-sphere composite (MoS2@HPCS) assembled by engineering HPCS-confined MoS2 with expanded (002) planes is proposed for boosting potassium-ion storage. When used as a PIB anode, the as-synthesized MoS2@HPCS composite shows superior potassium storage performance. It delivers a reversible capacity of 254.9 mAh g(-1) at 0.5 A g(-1) after 100 discharge/charge cycles and maintains 126.2 mAh g(-1) at 1 A g(-1) over 500 cycles. The superior potassium-ion storage performance is ascribed to the elaborate yolk-shell nanoarchitecture and the expanded interlayer of the MoS2 nanosheet, which could shorten the transport distance, enhance the electronic conductivity, relieve the volume variation, prevent the self-aggregation of MoS2, facilitate the electrolyte penetration, and boost the intercalation/deintercalation of K+. Moreover, the potential application of the MoS2@HPCS composite is also evaluated by assembled K-ion full cells with a perylenetetracarboxylic dianhydride cathode. Accordingly, the as-developed synthetic strategy can be extended to manufacture other host materials for PIBs and beyond.
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