Cobalt doping of tin disulfide/reduced graphene oxide nanocomposites for enhanced pseudocapacitive sodium-ion storage
Cobalt doping of tin disulfide/reduced graphene oxide nanocomposites for enhanced pseudocapacitive sodium-ion storage
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DOI：
10.1038/s42004-018-0086-z
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发表时间：
2018-11-23
影响因子：
5.9
通讯作者：
Yan, Fei
中科院分区：
文献类型：
--
作者：
Jia, Hao;Chen, Chen;Yan, Fei
可再充电钠离子电池作为锂离子电池的有前途的替代品正受到人们的强烈关注，然而，缺乏高性能的阳极材料限制了其进一步商业化。在这里，我们通过微波辅助水热法制备钴掺杂二硫化锡/还原氧化石墨烯纳米复合材料。在50 mA·g（-1）的电流密度下循环120次后，这些纳米复合材料的容量保持在636.2mAh·g（-1），并且在2A·g（-1）的电流密度下循环1500次后显示出328.3mA·h·g（-1）的容量。定量电容分析表明，纳米复合材料的电化学性能源于钴和硫掺杂的综合作用，导致二硫化锡的赝电容贡献增强（52.8%至89.8%，在1 mV s（-1））。这项工作提供了深入了解通过杂原子掺杂来调整层状过渡金属二硫属化物的结构，以开发用于钠离子电池的高性能阳极材料。
Rechargeable sodium-ion batteries are receiving intense interest as a promising alternative to lithium-ion batteries, however, the absence of high-performance anode materials limits their further commercialization. Here we prepare cobalt-doped tin disulfide/reduced graphene oxide nanocomposites via a microwave-assisted hydrothermal approach. These nano-composites maintain a capacity of 636.2 mAh g(-1) after 120 cycles under a current density of 50 mA g(-1), and display a capacity of 328.3 mA h g(-1) after 1500 cycles under a current density of 2 A g(-1). The quantitative capacitive analysis demonstrates that the electrochemical performance of the nanocomposite originates from the combined effects of cobalt and sulfur doping, resulting in the enhanced pseudocapacitive contribution (52.8 to 89.8% at 1 mV s(-1)) of tin disulfide. This work provides insight into tuning the structure of layered transition metal dichalcogenides via heteroatom doping to develop high-performance anode materials for sodium-ion batteries.