Zhang Yongguang, Ren Jun, Zhao Yan, Tan Taizhe, Yin Fuxing, Wang Yichao
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Synergy Innovation Institute of GDUT, Heyuan, Guangdong Province, China.
Beilstein J Nanotechnol. 2019 Feb 21;10:514-521. doi: 10.3762/bjnano.10.52. eCollection 2019.
In this work, a unique three-dimensional (3D) structured carbon-based composite was synthesized. In the composite, multiwalled carbon nanotubes (MWCNT) form a lattice matrix in which porous spherical reduced graphene oxide (RGO) completes the 3D structure. When used in Li-S batteries, the 3D porous lattice matrix not only accommodates a high content of sulfur, but also induces a confinement effect towards polysulfide, and thereby reduces the "shuttle effect". The as-prepared S-3D-RGO@MWCNT composite delivers an initial specific capacity of 1102 mAh·g. After 200 charging/discharge cycles, a capacity of 805 mAh·g and a coulombic efficiency of 98% were maintained, implying the shuttle effect was greatly suppressed by the composite matrix. In addition, the S-3D-RGO@MWCNT composite also exhibits an excellent rate capability.
在这项工作中，合成了一种独特的三维（3D）结构碳基复合材料。在该复合材料中，多壁碳纳米管（MWCNT）形成晶格基质，多孔球形还原氧化石墨烯（RGO）完善了3D结构。当用于锂硫电池时，3D多孔晶格基质不仅能容纳高含量的硫，还能对多硫化物产生限制作用，从而降低“穿梭效应”。所制备的S-3D-RGO@MWCNT复合材料的初始比容量为1102 mAh·g。经过200次充放电循环后，容量保持在805 mAh·g，库仑效率为98%，这意味着复合基质极大地抑制了穿梭效应。此外，S-3D-RGO@MWCNT复合材料还表现出优异的倍率性能。
