空心石墨球包覆的碗状碳化硅纳米微球应用于锂离子电池
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- 英文论文题名：Bowl-Like 3C-SiC Nanoshells Encapsulated in Hollow Graphitic Carbon Spheres for High-Rate Lithium-Ion Batteries
- 论文作者：李瀚文 ; 于慧娟 ; 杨东
- 英文论文作者：Hanwen Li ; Huijuan Yu ; Dong Yang ; State Key Laboratory of Molecular Engineering of Polymers ; Department of Macromolecular Science ; Fudan University
- 年：2016
- 作者机构：聚合物分子工程国家重点实验室复旦大学高分子科学系;
- 论文关键词：碳化硅纳米壳层 ; 中空石墨化碳球 ; 负极材料 ; 锂离子电池
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TM912;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：282k
- 原文格式：D
- 会议级别：全国
摘要
便携式电子设备和电动汽车的广泛使用大大推动了锂离子电池的开发和应用,而研制容量高、倍率性能优异的电极材料对于发展新一代锂离子电池至关重要。近年来,作为传统意义上电化学惰性的碳化硅(SiC)被证明具有一定的储锂容量~([1-3]),但其存在的问题是材料结构难控制,倍率性能较差~([4-5])。Hersam等人~([6])通过在SiC表面生长石墨烯抑制其表面氧化,可"激活"SiC的电化学性能。本文中,我们通过独特的结构设计,采用高温碳热还原二氧化硅的方法制备了超薄石墨碳空心球壳包覆的碗状碳化硅纳米微球(SiC@HGSs),如Fig.1。该结构中,碳化硅壳层与石墨碳紧密贴合,抑制了SiC表面氧化,而且碗状结构使得壳层两侧可充分浸润电解液。电化学测试结果显示,SiC@HGSs在电流密度为0.6Ag~(-1)下循环600次仍具有1345 mAh g~(-1)的比容量,在电流密度为3 Ag~(-1)下循环1000次可保持742 mAh g~(-1)的比容量。此外,当电流密度提高至6Ag~(-1),SiC@HGSs仍具有400mAh g~(-1)左右的比容量。如此优异的电化学性能使得SiC@HGSs在锂电池负极研究中显示出重要的价值。
Searching for new electrode materials with excellent electrochemical performance is crucial for the development of next-generation lithium-ion batteries(LIBs).Silicon carbide(SiC),which is traditionally considered to be electrochemically inert toward lithiation,has recently been demonstrated to be a potential high-performance anode material upon activation by surface graphitization.Herein,we designed and synthesized a novel type of SiC nanostructures in which bowl-like,ultrathin SiC nanoshells were encapsulated in hollow graphitic carbon spheres(designated as SiC@HGSs).When used as LIB anodes,SiC@HGSs retained a stable capacity of 1345 mAh g~(-1) at a current density of 0.6 A g~(-1) after 600 cycles and 742 mAh g~(-1) at 3 A g~(-1) after 1000 cycles.Even at a high current density of 6 A g~(-1),SiC@HGSs could still deliver a capacity of ~ 400 mAh g~(-1).The superior high-rate performance is attributable to the unique architecture and exceptional structural durability of SiC@HGSs.
Searching for new electrode materials with excellent electrochemical performance is crucial for the development of next-generation lithium-ion batteries(LIBs).Silicon carbide(SiC),which is traditionally considered to be electrochemically inert toward lithiation,has recently been demonstrated to be a potential high-performance anode material upon activation by surface graphitization.Herein,we designed and synthesized a novel type of SiC nanostructures in which bowl-like,ultrathin SiC nanoshells were encapsulated in hollow graphitic carbon spheres(designated as SiC@HGSs).When used as LIB anodes,SiC@HGSs retained a stable capacity of 1345 mAh g~(-1) at a current density of 0.6 A g~(-1) after 600 cycles and 742 mAh g~(-1) at 3 A g~(-1) after 1000 cycles.Even at a high current density of 6 A g~(-1),SiC@HGSs could still deliver a capacity of ~ 400 mAh g~(-1).The superior high-rate performance is attributable to the unique architecture and exceptional structural durability of SiC@HGSs.
引文
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[2]Moradian,R.;Behzad,S.;Chegel,R.Phys.Lett.A 2009,373:2260.
[3]Wang,X.;Liew,K.M.J.Phys.Chem.C 2012,116:26888.
[4]Zhang,H.;Xu,H.Solid State Ionics 2014,263:23.
[5]Sri Devi Kumari,T.;Jeyakumar,D.;Prem Kumar,T.RSC Adv.2013,3:15028.
[6]Lipson,A.L.;Chattopadhyay,S.;Karmel,H.J.;Fister,T.T.;Emery,J.D.Dravid,V.P.;Thackeray,M.M.;Fenter,P.A.;Bedzyk,M.J.;Hersam,M.C.J.Phys.Chem.C 2012,116:20949.