SnO_(2) quantum dots modified N-doped carbon as high-performance anode for lithium ion batteries by enhanced pseudocapacitance  

作　　者：Cui-Ping Wu Kai-Xuan Xie Jia-Peng He Qing-Peng Wang Jian-Min Ma Shun Yang Qing-Hong Wang 

机构地区：[1]School of Chemistry and Materials Science,Jiangsu Normal University,Xuzhou 221116,China [2]Institute of Biopharmaceutical Research,Liaocheng University,Liaocheng 252059,China [3]School of Physics and Electronics,Hunan University,Changsha 410082,China [4]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou University,Zhengzhou 450002,China

出　　处：《Rare Metals》2021年第1期48-56,共9页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51702138 and 21817056);the Natural Science Foundation of Jiangsu Province(Nos.BK20160213 and BK20170239);the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX202358)。

摘　　要：SnO_(2) is considered to be a promising candidate as anode material for lithium ion batteries,due to its high theoretical specific capacity(1494 mAh·g^(-1)).Nevertheless,SnO_(2)-based anodes suffer from poor electronic conductivity and serious volume variation(300%)during lithiation/delithiation process,leading to fast capacity fading.To solve these problems,SnO_(2) quantum dots modified N-doped carbon spheres(SnO_(2) QDs@N-C)are fabricated by facile hydrolysis process of SnCl2,accompanied with the polymerization of polypyrrole(PPy),followed by a calcination method.When used as anodes for lithium ion batteries,SnO_(2) QDs@N-C exhibits high discharge capacity,superior rate properties as well as good cyclability.The carbon matrix completely encapsulates the SnO_(2) quantum dots,preventing the aggregation and volume change during cycling.Furthermore,the high N content produces abundant defects in carbon matrix.It is worth noting that SnO_(2) QDs@N-C shows excellent capacitive contribution properties,which may be due to the ultra-small size of SnO_(2) and high conductivity of the carbon matrix.

关 键 词：Tin dioxide Quantum dots Nitrogen-doped carbon Lithium ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ134.32[化学工程—无机化工]