摘要
WS2 has been considered as a promising anode material due to its high lithium storage capacity as well as fascinating physical properties. However, the insufficient electrical and ionic conductivities deteriorate the rate per- formance of the batteries. Herein, we report a simple synthetic approach towards graphene-WS2 hybrids by rolling graphene into a hollow nanotube in which WSz nanoplates are en- capsulated. This new electrode design strategy facilitates the fabrication of integrated and binder-free lithium ion battery and sodium ion battery electrodes by combining electrospin- ning and chemical vapor deposition （CVD） methods. Bene- fiting from their confined growth and the interconnected in- situ graphitic carbon coating nanocable web, the WS2@G with nano-level WS2 dispersion not only provides an efficiently conductive and electrolyte accessible framework, but effec- tively alleviates the volume change during the cycling, en- abling a mechanically robust binder-free electrode along with the outstanding electrochemical Li＋ and Na＋ storage proper- ties.
本论文通过结构设计及简单方法成功制备一种二维石墨烯-WS_2复合结构,即WS_2纳米片嵌入石墨烯化中空纳米碳管中(WS_2@G).这种新的电极结构采用静电纺丝技术和化学气相沉积技术组合的方式,有利于实现集成化和无粘结剂锂离子或钠离子电池电极材料制备.采用内部的受限生长以及原位的石墨化碳包覆纳米同轴的互贯网络,得到纳米尺度WS_2片层分散的WS_2@G复合结构,能够提供有效的导电性和电解液浸润性的网络结构,同时还能够有效地降低电池在充放电循环过程中导致的体积膨胀效应,最终实现一种高机械性能、无粘结剂、优异电化学活性的电极在锂离子或钠离子电池储能领域中的应用.
基金
supported by the Ministry of Science and Technology of China (2012CB933403)
the National Natural Science Foundation of China (51425302, 51302045 and 5170021056)
Beijing Municipal Science and Technology Commission (Z121100006812003)
the Opening Project of State Key Laboratory of Advanced Technology for Float Glass
the Chinese Academy of Sciences
