文献类型：期刊文献

英文题名：Promoting sulfur immobilization by a hierarchical morphology of hollow carbon nanosphere clusters for high-stability Li-S battery

作者：Chen, Mingqi[1];Su, Zhe[1];Jiang, Kai[1];Pan, Yankai[1];Zhang, Yayun[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：7

期号：11

起止页码：6250

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20191106640819);WOS:【SCI-EXPANDED(收录号:WOS:000463970400035)】；

基金：This work was supported by National Natural Science Foundation of China (no. 21878091 and no. 21576090), and Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Nanospheres - Pore structure - Lithium compounds - Morphology - Microporosity - Polysulfides - Lithium batteries

摘要：Immobilization of sulfur on a conductive carbon host is a valid way to resolve the insulating nature of sulfur and relieve the polysulfide shuttle. Herein, we enhanced the physical immobilization efficiency of sulfur through deliberate design of a carbon nanostructure, which integrated microporous, mesoporous and hollow nanostructures into a micrometer-sized particle. A hierarchical morphology of hollow carbon nanosphere clusters (HCNCs) was fabricated for the first time using a colloid chemistry route combined with spray drying technology. The as-prepared HCNCs have numerous interior hollows achieving higher sulfur-loading and buffering volume expansion, mesoporous channels for rapid ion transfer, and a microporous carbon sheath minimizing lithium polysulfide shuttling. This unique carbon architecture endowed HCNCs/S composites with superior cyclability and rate capability. They could deliver a high initial capacity of 1311 mA h g(-1) at 0.2C and a reversible capacity of 695 mA h g(-1) after 500 cycles with a low capacity fading rate of 0.094% per cycle. The sulfur cathode demonstrated good rate capability, with 592 mA h g(-1) at 5C. Integrating different morphologies and pore structures can embody the merits and mitigate the shortcomings of every individual component, which can be an effective path for future development of high-rate and long-cycle Li-S batteries.