纳米片
材料科学
插层(化学)
溴化铵
电化学
电解质
化学工程
石墨
电极
纳米颗粒
超级电容器
无机化学
纳米技术
复合材料
物理化学
化学
工程类
肺表面活性物质
作者
Yuanhua Xiao,Xiaobing Zhao,Xuezhao Wang,Dangcheng Su,Shuo Bai,Wei Chen,Shaoming Fang,Liming Zhou,Hui‐Ming Cheng,Feng Li
标识
DOI:10.1002/aenm.202000666
摘要
Abstract Intercalation chemistry/engineering has been widely investigated in the development of electrochemical energy storage. Graphite, as an old intercalation host, is receiving vigorous attention again via a new halogen intercalation. Whereas, exploiting new intercalation hosts and optimizing the intercalation effect still remains a great challenge. This study fabricates a Cu 2 Se intercalation compound showing expanded interlayer space and nanosheet array features by using a green growth approach, in which cetyltrimethyl ammonium bromide (CTAB) is inserted into Cu 2 Se at an ambient temperature. When acting as an electrode material for sodium‐ion batteries, the Cu 2 Se–CTAB nanosheet arrays exhibit excellent discharge capacity and rate capability (426.0 mAh g −1 at 0.1 A g −1 and 238.1 mAh g −1 at 30 A g −1 ), as well as high capacity retention of ≈90% at 20 A g −1 after 6500 cycles. Benefiting from the porous array architecture, the transport of electrolytes is facilitated on the surface of Cu 2 Se nanosheets. In particular, the CTAB intercalated in the interlayer space of Cu 2 Se can increase its buffer space, stabilize the polyselenide shuttle, and prevent the fast growth of Cu nanoparticles during its electrochemical process.
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