Carbon-Free Crystal-like Fe1-xS as an Anode for Potassium-Ion Batteries.
Carbon-Free Crystal-like Fe1-xS as an Anode for Potassium-Ion Batteries.
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DOI：
10.1021/acsami.1c17799
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发表时间：
2021-11
影响因子：
9.5
通讯作者：
Yuhan Wu;Rui Xu;Zhijie Wang;Xiaorui Hao;Chenglin Zhang;Huaping Zhao;Wei Li;Shouzhi Wang;
中科院分区：
文献类型：
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作者：
Yuhan Wu;Rui Xu;Zhijie Wang;Xiaorui Hao;Chenglin Zhang;Huaping Zhao;Wei Li;Shouzhi Wang;
钾离子电池(PIB)作为一种新型的电化学储能系统，被认为是后锂离子电池时代的理想选择。然而，这一领域的研究还处于起步阶段，迫切需要开发高性能、低成本的电极材料。硫化铁作负极材料具有理论容量大、环境友好、成本低等优点，引起了人们的广泛关注。在此，我们构建了无碳晶状Fe1-xS，并论证了其作为PIB阳极的可行性。这种独特的结构特征使所制备的Fe1-Xs具有丰富的电化学反应活性中心和较短的离子/电子传输路径。Fe_(1-x)S电极以0.1Ag~(-1)循环100次，容量为420.8 mAHg~(-1)，以1.0A·g~(-1)循环250次，容量为212.9 mA·g~(-1)。即使在5.0Ag-1的高倍率下，平均容量也达到了167.6 mAHg-1。以Fe1-xS为阳极，普鲁士蓝钾为阴极组装成钾离子全电池，经50次循环后，100 mAg-1放电容量达127.6 mAHg-1。
Potassium-ion batteries (PIBs) as a new electrochemical energy storage system have been considered as a desirable candidate in the post-lithium-ion battery era. Nevertheless, the study on this realm is in its infancy; it is urgent to develop electrode materials with high electrochemical performance and low cost. Iron sulfides as anode materials have aroused wide attention by virtue of their merits of high theoretical capacities, environmental benignity, and cost competitiveness. Herein, we constructed carbon-free crystal-like Fe1-xS and demonstrated its feasibility as a PIB anode. The unique structural feature endows the prepared Fe1-xS with plentiful active sites for electrochemical reactions and short transmission pathways for ions/electrons. The Fe1-xS electrode retained capacities of 420.8 mAh g-1 after 100 cycles at 0.1 A g-1 and 212.9 mAh g-1 after 250 cycles at 1.0 A g-1. Even at a high rate of 5.0 A g-1, an average capacity of 167.6 mAh g-1 was achieved. In addition, a potassium-ion full cell is assembled by employing Fe1-xS as an anode and potassium Prussian blue as a cathode; it delivered a discharge capacity of 127.6 mAh g-1 at 100 mA g-1 after 50 cycles.