Jiang Min, Zhang Fangzhou, Zhu Guanjia, Ma Yuanyuan, Luo Wei, Zhou Tengfei, Yang Jianping
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, International Joint Laboratory for Advanced Fiber and Low-dimension Materials, Donghua University, Shanghai 201620, China.
Institute of Functional Materials, Donghua University, Shanghai 201620, China.
ACS Appl Mater Interfaces. 2020 Jun 3;12(22):24796-24805. doi: 10.1021/acsami.0c05116. Epub 2020 May 20.
A new two-dimensional material (MXene) has been compounded lately with silicon as anodes for lithium-ion batteries to achieve excellent lithium storage performances on account of its unique properties, such as high electrical conductivities, low ion diffusion barrier, and large surface area. However, the exposed silicon particles may lead to fast capacity decaying upon direct contact with the electrolyte. To solve this issue, the porous silicon and SiO are introduced into TiCT to construct a conductive network, and then TiC@Si/SiO are covered with amorphous TiO to make a sandwiched TiC@Si/SiO@TiO composite. Owing to the cooperation of the TiC matrix, Si/SiO interlayer, and amorphous TiO layer, the reversible capacity of the TiC@Si/SiO@TiO composite with a sandwiched structure can be maintained at 939 mA h g after 100 cycles and enhanced capacity retention capabilities in the initial 10 cycles can be came ture. The combination of these four components also makes the TiC@Si/SiO@TiO composite material a promising application prospect in lithium-ion batteries.
最近，一种新型二维材料（MXene）已与硅复合作为锂离子电池的阳极，由于其独特的性能，如高电导率、低离子扩散势垒和大表面积，从而实现了优异的锂存储性能。然而，暴露的硅颗粒在与电解质直接接触时可能会导致快速的容量衰减。为了解决这个问题，将多孔硅和SiO引入TiCT中以构建导电网络，然后用非晶TiO覆盖TiC@Si/SiO，制成夹心结构的TiC@Si/SiO@TiO复合材料。由于TiC基体、Si/SiO中间层和非晶TiO层的协同作用，具有夹心结构的TiC@Si/SiO@TiO复合材料在100次循环后可逆容量可保持在939 mA h g，并且在初始10次循环中可以实现增强的容量保持能力。这四种成分的组合也使得TiC@Si/SiO@TiO复合材料在锂离子电池中具有广阔的应用前景。
