Homogeneous Intercalation Chemistry and Ultralow Strain of 1T’’’ MoS2 for Stable Potassium Storage
Homogeneous Intercalation Chemistry and Ultralow Strain of 1T’’’ MoS2 for Stable Potassium Storage
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1T ' ' MoS2稳定储钾的均匀插层化学和超低应变
DOI：
10.1002/adfm.202306550
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发表时间：
2023-07
影响因子：
19
通讯作者：
Miao Xie;Zhuoran Lv;Yuan Wang;Wei Zhao;Xin Pang;Chendong Zhao;Yuqiang Fang;Jian Huang;
中科院分区：
文献类型：
--
作者：
Miao Xie;Zhuoran Lv;Yuan Wang;Wei Zhao;Xin Pang;Chendong Zhao;Yuqiang Fang;Jian Huang;
Intercalation anodes usually exhibit better cyclability than conversion and alloying anodes for lithium or sodium storage due to the robust layered structure. However, for larger‐sized potassium accommodation, these intercalation anodes usually undergo huge layer expansion and structural distortion, triggering severe capacity fading. Herein, the novel 1T’’’ MoS2 is revealed the intercalation anode for stable K+ storage, in which metallic Mo─Mo bonds and puckered S layers accelerate the charge transfer and homogeneous K+ insertion. Moreover, the ultralow strain (3.5%) induced by the non‐detachable potassium ions pillar sustains the layered structure. Consequently, 1T’’’ MoS2 achieves a reversible capacity of 125 mA h g−1 at 0.2 C and keeps nearly 100% capacity retention at 1 C over 500 cycles. In situ characterizations and density functional theory simulations reveal the in‐depth intercalation reaction accompanied by the MoS2 phase transformation between 1T’’’ and 1T’ during cycling. Furthermore, a 1T’’’ MoS2//MCMB K‐dual ion battery displays a superior cycling lifespan with 98% capacity retention over 250 cycles. This study provides a new intercalation anode and contribute to the electrode design for stable potassium ion storage.
