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Sheet-to-layer structure of SnSe2/MXene composite materials for advanced sodium ion battery anodes
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0nj04788k Tongxin Fan 1, 2, 3, 4, 5 , Yuanke Wu 1, 2, 3, 4, 5 , Jie Li 1, 2, 3, 4, 5 , Wei Zhong 1, 2, 3, 4, 5 , Wenwen Tang 1, 2, 3, 4, 5 , Xuan Zhang 1, 2, 3, 4, 5 , Maowen Xu 1, 2, 3, 4, 5
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0nj04788k Tongxin Fan 1, 2, 3, 4, 5 , Yuanke Wu 1, 2, 3, 4, 5 , Jie Li 1, 2, 3, 4, 5 , Wei Zhong 1, 2, 3, 4, 5 , Wenwen Tang 1, 2, 3, 4, 5 , Xuan Zhang 1, 2, 3, 4, 5 , Maowen Xu 1, 2, 3, 4, 5
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SnSe2 is regarded as an auspicious anode material for sodium-ion batteries owing to its high theoretical capacity and large interlayer spacing. However, the moderate conductivity, inevitable aggregation, and tremendous volumetric expansion (more than 300%) of SnSe2 still plague its large-scale use. Thus, a sheet-to-layer structure SnSe2/Ti3C2Tx (MXene) composite material has been synthesized in this work using an electrostatic assembling procedure. The SnSe2/Ti3C2Tx composite electrode delivered a superior sodium storage performance in a high specific capacity of 245 mA h g−1 at 1 A g−1 (5.4 times that of SnSe2 and 4.1 times that of Ti3C2Tx) with a capacity attenuation rate of only ∼0.06% per cycle after 445 cycles. This electrode material not only combines the advantages (high theoretical capacity SnSe2 and high conductivity of Ti3C2Tx) of these two components, but also shows synergistic effects; these are: (i) the inserted SnSe2 nanosheets can inhibit the self-stacking problem of Ti3C2Tx and Ti3C2Tx and can prevent the aggregation of SnSe2 nanosheets and alleviate the volume expansion of SnSe2 nanosheets during cycling; (ii) the increased surface area with the mesoporous structure is favorable for sodium ion kinetics and simultaneously conducive to electrolyte penetration and rapid ion diffusion during cycling.
中文翻译：
用于高级钠离子电池阳极的SnSe2 / MXene复合材料的层到层结构
SnSe 2具有较高的理论容量和较大的层间距，因此被认为是钠离子电池的吉祥阳极材料。但是，SnSe 2的适度电导率，不可避免的聚集和巨大的体积膨胀（超过300％）仍然困扰着其大规模使用。因此，在这项工作中，已经使用静电组装方法合成了片层结构SnSe 2 / Ti 3 C 2 T x（MXene）复合材料。SnSe 2 / Ti 3 C 2 T x复合电极以245 mA hg的高比容量提供了卓越的钠存储性能-1 1 A G -1（5.4倍位SnSe的2和4.1倍，的Ti 3 c ^ 2 Ť X）与445次循环后的每个周期仅~0.06％的容量衰减率。这种电极材料不仅结合了这两种成分的优点（高理论容量SnSe 2和高导电性Ti 3 C 2 T x），而且还显示出协同效应。它们是：（i）插入的SnSe 2纳米片可以抑制Ti 3 C 2 T x和Ti 3 C 2 T的自堆积问题x并可以防止SnSe 2纳米片的聚集并减轻循环过程中SnSe 2纳米片的体积膨胀；（ii）具有中孔结构的增加的表面积有利于钠离子动力学，同时有利于循环中电解质的渗透和离子的快速扩散。
更新日期：2021-01-13
中文翻译：
用于高级钠离子电池阳极的SnSe2 / MXene复合材料的层到层结构
SnSe 2具有较高的理论容量和较大的层间距，因此被认为是钠离子电池的吉祥阳极材料。但是，SnSe 2的适度电导率，不可避免的聚集和巨大的体积膨胀（超过300％）仍然困扰着其大规模使用。因此，在这项工作中，已经使用静电组装方法合成了片层结构SnSe 2 / Ti 3 C 2 T x（MXene）复合材料。SnSe 2 / Ti 3 C 2 T x复合电极以245 mA hg的高比容量提供了卓越的钠存储性能-1 1 A G -1（5.4倍位SnSe的2和4.1倍，的Ti 3 c ^ 2 Ť X）与445次循环后的每个周期仅~0.06％的容量衰减率。这种电极材料不仅结合了这两种成分的优点（高理论容量SnSe 2和高导电性Ti 3 C 2 T x），而且还显示出协同效应。它们是：（i）插入的SnSe 2纳米片可以抑制Ti 3 C 2 T x和Ti 3 C 2 T的自堆积问题x并可以防止SnSe 2纳米片的聚集并减轻循环过程中SnSe 2纳米片的体积膨胀；（ii）具有中孔结构的增加的表面积有利于钠离子动力学，同时有利于循环中电解质的渗透和离子的快速扩散。
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