期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 566, 期 -, 页码 427-433出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.01.113
关键词
MoS2; Flexible N doped carbon; Core/sheath framework; Potassium ion batteries; Buffering volume expansion
资金
- National Natural Science Foundation of China [11574060, 51704188, 51464020, 51702199]
- Shaanxi University of Science and Technology [2018GBJ-04]
Suitable anode materials for potassium ion batteries (KIBs) with high capacity, good reversibility and stable cycling performances are still in large demand. Here, flexible N doped carbon/bubble-like MoS2 core/sheath framework (MoS2/NCS) is prepared as an anode material for potassium ion batteries. The N doped carbon sponge (NCS) skeleton with good conductivity and high surface area guarantees superior rate capability and high stability of MoS2/NCS anode. The chemical bonds (C-Mo) firmly bridge MoS2 and NCS together, which further ensures MoS2/NCS stable cycling performance. More importantly, volume expansion is greatly buffered during cycling by this unique structure: the voids between bubble-like MoS2 sheath and NCS core can effectively buffer volume expansion generated during potassium intercalation/deintercalation; the enlarged interlayer spacing contribute more space to buffer volume change; the ultrathin nanosheets can shorten the charge diffusion distance and buffer volume change. As a consequence, MoS2/NCS delivers a capacity of 374 mAh g(-1) over 200 cycles at 50 mA g(-1) . Even at 1000 mA g(-1), a capacity of 212 mAh g(-1) can still be obtained over 1000 cycles. We believe this MoS2/NCS structure will highlight the potential of MoS2 in practical KIBs applications. (C) 2020 Elsevier Inc. All rights reserved.
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