MXenes公司
材料科学
电极
锂(药物)
电化学
纳米技术
范德瓦尔斯力
碳纳米纤维
堆积
碳纤维
导电体
化学工程
碳纳米管
复合材料
化学
复合数
分子
有机化学
医学
物理化学
内分泌学
工程类
作者
Junpeng Xiao,Qi Jin,Ruibai Cang,Hong Gao,Jianhua Yao
标识
DOI:10.1016/j.electacta.2023.142289
摘要
Because of the excellent conductivity, tunability of elements and surface groups, MXenes are seen as promising electrode materials for lithium-ion storage devices. However, Van der Waals force causes MXene nanosheets to aggregate and re-stack, limiting their applications. Here, we design a carbon-coated MXene nanofiber (C@MXene) free-standing electrode with a 3D conductive network and excellent flexibility to overcome the intrinsic stacking and agglomeration in MXene. Furthermore, the 3D conductive network provides fast lanes for electron transfer, improves the electrochemical activity. And the free-standing electrode structure, which is a straightforward approach for constructing the working electrode and a basis for the following large-scale manufacturing, does not require the auxiliary material and conductive agent to manufacture the electrode material. In particular, the C@V2CTx exhibits outstanding electrochemical performance. At 0.1 A g − 1, over 600 mAh g − 1 was exhibited after 175 cycles, and over 400 mAh g − 1 after 1000 cycles at 2.0 A g − 1, cycle retention is close to 100%. Besides, the electrochemical properties of other C@MXene (Nb2CTx, Ti2CTx and VTiCTx) are also optimized to varying degrees. The construction of 3D C@MXene free-standing electrode structure provides a new idea for enhancing the electrochemical performance of MXene.
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