Biogel-Derived Polycrystalline MnO Spheres/S-Doped Carbon Composites with Enhanced Performance as Anode Materials for Lithium-Ion Batteries
Biogel-Derived Polycrystalline MnO Spheres/S-Doped Carbon Composites with Enhanced Performance as Anode Materials for Lithium-Ion Batteries
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DOI：
10.1002/celc.201700066
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Hongzhan Yang;Wei Liu;Y. Zhang;Huanlei Wang;Shuang Liu;Shougang Chen;Fengli Cheng;Shuping Zhao
中科院分区：
文献类型：
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作者：
Hongzhan Yang;Wei Liu;Y. Zhang;Huanlei Wang;Shuang Liu;Shougang Chen;Fengli Cheng;Shuping Zhao
为满足先进储能设备的实际需求，低成本、高性能、易于规模化生产的电极材料成为当前研究的热点。本文以一种天然海洋生物质石花菜（Gelidium amansii）为原料，通过简单的生物溶胶-凝胶和热解工艺制备了具有分级孔隙结构的多晶MnO球/硫掺杂碳复合材料（MnO/SC）。通过诱导生物凝胶，制备了由硫掺杂碳网包裹和交织的多晶MnO球的独特复合材料，与其他报道的生物衍生MnO/C材料相比，其活性材料的负载量更高。作为锂离子电池的负极材料，所获得的MnO/SC复合材料在0.2 A g-1下200次循环后提供了1100 mAh g-1的高可逆容量，并且即使在2 A g-1的高电流密度下1000次循环后仍具有超过500 mAh g-1的上级的长期循环性能。因此，本工作为利用丰富的天然矿物资源大规模制备高性能电极材料提供了一条可行的途径。
To meet the practical requirement of advanced storage equipment, the electrode materials with low cost, high performance and readily large-scale production are of intensive concern nowadays. In this work, a natural marine biomass-gelidium amansii was used to fabricate novel polycrystalline MnO spheres/S-doped carbon composites (MnO/SC) with hierarchical porosity via a simple bio-sol-gel and pyrolysis process. By inducing bio-gels, the unique composites of polycrystalline MnO spheres encapsulated and interweaved by sulfur-doped carbon net were created, which leads to a higher loading of active materials in contrast to other reported bio-derived MnO/C materials. As anode materials for lithium ion batteries, the obtained MnO/SC composites delivered a high reversible capacity of 1100 mAh g-1 after 200 cycles at 0.2 A g-1 and a superior long-term cycling performance of over 500 mAh g-1 after 1000 cycles even at the high current density of 2 A g-1. Therefore, the present work represents a feasible large-scale fabricating approach toward the high performance electrode materials on base of rich natural biogels.