Crumpled reduced graphene oxide conformally encapsulated hollow V2O5 nano/microsphere achieving brilliant lithium storage performance
Crumpled reduced graphene oxide conformally encapsulated hollow V2O5 nano/microsphere achieving brilliant lithium storage performance
复制标题
皱缩还原氧化石墨烯保形封装空心V2O5纳米/微球实现出色的锂存储性能
DOI：
10.1016/j.nanoen.2016.04.002
复制
发表时间：
2016-06-01
期刊：
影响因子：
17.6
通讯作者：
Sun, Xueliang
中科院分区：
文献类型：
--
作者：
Yan, Bo;Li, Xifei;Sun, Xueliang
开发一种简便且可扩展的方法来合成具有优异倍率性能和突出循环稳定性的高能锂离子电池（LIB）电极材料以用于新一代能量存储装置仍然是一个挑战。在这项研究中，第一次，我们报告了一个皱巴巴的还原氧化石墨烯（cG）封装的三维（3D）中空五氧化二钒（V2O5）纳米/微球制造的一步溶剂热处理，随后退火。这种快速有效的合成方法是环境友好和经济有益的，不涉及昂贵的有机钒源，繁琐的操作，或复杂的设备。值得注意的是，所需的CG包封的V2O5复合材料含有5重量%的还原氧化石墨烯（rGO），但表现出出色的倍率容量和循环稳定性。该产品在100 mA g（-1）时可提供289 mA h g（-1）的可逆容量，在5000 mA g（-1）时可提供163 mA h g（-1）的可逆容量。（492瓦·小时·千克（-1）和9840瓦·千克（-1）），以及在2.0 V和4.0 V（相对于Li/Li+）之间的电势范围内在2000 mA g（-1）下200次循环后约94%的容量保持率。通过大量的实验研究，阐明了所设计材料的独特结构特征和典型的形成机理。更值得称赞的是，使用这种可扩展的反应系统成功地封装了一系列固体粉末。这种多功能的合成方法将为cG的应用提供便利，并为制备更有吸引力的rGO基功能材料提供新的途径。(C)2016爱思唯尔有限公司版权所有
It has remained a challenge to develop a facile and scalable approach to synthesize high-energy lithium-ion battery (LIB) electrode materials with excellent rate capabilities and prominent cycling stabilities for their applications in new generation energy storage devices. In this study, for the first time, we report a crumpled reduced graphene oxide (cG) encapsulated three-dimensional (3D) hollow vanadium pentoxide (V2O5) nano/microspheres fabricated by one-step solvothermal treatment followed by subsequent annealing. This rapid and effective synthesis method is environmental friendly and economically beneficial without involving costly organic vanadium sources, tedious operation, or sophisticated equipment. Remarkably, the desired cG-encapsulated V2O5 composite contains 5 wt% reduced graphene oxide (rGO), yet exhibits outstanding rate capacities and cycling stabilities. This product can deliver reversible capacities of 289 mA h g(-1) at 100 mA g(-1) and 163 mA h g(-1) at 5000 mA g(-1) (492 W h kg(-1) and 9840 W kg(-1)), as well as a capacity retention of about 94% after 200 cycles at 2000 mA g(-1) in the potential range between 2.0 V and 4.0 V (vs. Li/Li+). Furthermore, the unique structural feature and typical formation mechanism of the designed materials are clarified based on multiple experimental results. More commendably, a chain of solid powders had been successfully encapsulated using this scalable reaction system. It is expected that this versatile approach will facilitate the applications of cG, and provide a novel avenue to create more fascinating rGO-based functional materials. (C) 2016 Elsevier Ltd. All rights reserved.