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Metal–Semiconductor Phase Twinned Hierarchical MoS 2 Nanowires with Expanded Interlayers for Sodium‐Ion Batteries with Ultralong Cycle Life
Author(s) -
Ye Wei,
Wu Fangfang,
Shi Nianxiang,
Zhou Han,
Chi Qianqian,
Chen Weihua,
Du Shiyu,
Gao Peng,
Li Haibo,
Xiong Shenglin
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201906607
Subject(s) - materials science , anode , nanowire , electrode , phase (matter) , chemical engineering , semiconductor , metal , ion , sodium , nanotechnology , optoelectronics , metallurgy , chemistry , organic chemistry , engineering
Sodium‐ion batteries (SIBs) are considered a prospective candidate for large‐scale energy storage due to the merits of abundant sodium resources and low cost. However, a lack of suitable advanced anode materials has hindered further applications. Herein, metal–semiconductor mixed phase twinned hierarchical (MPTH) MoS 2 nanowires with an expanded interlayer (9.63 Å) are engineered and prepared using MoO 3 nanobelts as a self‐sacrificed template in the presence of a trace amount of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O as initiator. The greatly expanded interlayer spacing accelerates Na + insertion/extraction kinetics, and the metal–semiconductor mixed phase enhances electron transfer ability and stabilizes electrode structure during cycling. Benefiting from the structural merits, the MPTH MoS 2 electrode delivers high reversible capacities of 200 mAh g −1 at 0.1 A g −1 for 200 cycles and 154 mAh g −1 at 1 A g −1 for 2450 cycles in the voltage range of 0.4–3.0 V. Strikingly, the electrode maintains 6500 cycles at a current density of 2 A g −1 , corresponding to a capacity retention of 82.8% of the 2nd cycle, overwhelming the all reported MoS 2 cycling results. This study provides an alternative strategy to boost SIB cycling performance in terms of reversible capacity by virtue of interlayer expansion and structure stability.