期刊
ELECTROCHIMICA ACTA
卷 276, 期 -, 页码 21-27出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.04.164
关键词
Hierarchical porous carbon; Cathode material; Volumetric expansion; Polyselenides; Rechargeable Na-Se batteries
资金
- National Natural Science Foundation of China [21773188]
- Basic and Frontier Research Project of Chongqing [cstc2015jcyjA50031]
- Fundamental Research Funds for the Central Universities [XDJK2017A002, XDJK2017B048]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
The low Se loading, volumetric expansion and polyselenide shuttling between cathode and anode are major factors to limit the further development of Na-Se batteries. To overcome above issues, metal organic complex derived hierarchical porous carbon (HPC) was synthesized as host matrix for Se via a facile synthesis combined with annealing treatment. The unique hollow structure holds numerous micropores and mesopores for Se loading to form Se-HPC composite. The Se-HPC electrode shows outstanding rate capabilities of 330 and 260 mA h g(-1) at 1 C and 5 C, respectively. It also exhibits a stable cycling performance for 1000 cycles at 2 C with a small capacity decay rate of 0.04% per cycle. Such good performance demonstrates the viability of Na-Se batteries with high Se loading of 56%, which may be attributed to the unique hollow structure of HPC with Se encapsulated within micropores and mesopores. This attractive structure not only promotes electrolyte infiltration and electron transfer but also provides additional buffer space to buffer volumetric expansion of Se and suppress polyselenides dissolution in carbonate electrolyte during cycling. (C) 2018 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据