Flexible self-standing graphene-Se@CNT composite film as a binder-free cathode for rechargeable Li-Se batteries
Flexible self-standing graphene-Se@CNT composite film as a binder-free cathode for rechargeable Li-Se batteries
复制标题
DOI：
10.1016/j.jpowsour.2014.04.027
复制
发表时间：
2014-10-01
影响因子：
9.2
通讯作者：
Dai, Fang
中科院分区：
文献类型：
--
作者：
Han, Kai;Liu, Zhao;Dai, Fang
通过简单的两步组装工艺合成了柔性的、自支撑的石墨烯-Se @CNT复合膜。该膜可直接用作可充电锂硒电池的阴极，而无需额外的粘合剂和导电添加剂。它表现出比石墨烯Se复合膜高得多的可逆容量和循环稳定性（在0.1C下100次循环后为315 mAh g（-1））。改善的电化学性能主要归因于石墨烯和CNT的协同效应，其不仅用作应变/应力释放和体积膨胀的柔性支架，而且还提供具有用于电子转移和Li离子扩散的开放通道的三维导电架构，以及对可溶性多硒化物的强限制。(C)2014爱思唯尔有限公司版权所有。
A flexible, self-standing graphene-Se@CNT composite film has been synthesized by a facile two-step assembly process. The film is directly employed as cathode for rechargeable Li-Se batteries without extra binders and conductive additives. It exhibits much higher reversible capacity and cycling stability (315 mAh g(-1) after 100 cycles at 0.1 C) than graphene Se composite film. The improved electrochemical performance is mainly attributed to the synergistic effects of graphene and CNT, which not only function as a flexible scaffold for strains/stresses release and volume expansion, but also offer a three-dimensional conductive architecture with open channels for electron transfer and Li ion diffusion, as well as strong confinement of soluble polyselenides. (C) 2014 Elsevier B.V. All rights reserved.