SnO2 quantum dots modified N-doped carbon as high-performance anode for lithium ion batteries by enhanced pseudocapacitance

来源期刊:Rare Metals2021年第1期

论文作者:Cui-Ping Wu Kai-Xuan Xie Jia-Peng He Qing-Peng Wang Jian-Min Ma Shun Yang Qing-Hong Wang

文章页码:48 - 56

摘    要:SnO2 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,SnO2-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,SnO2 quantum dots modified N-doped carbon spheres(SnO2 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,SnO2 QDs@N-C exhibits high discharge capacity,superior rate properties as well as good cyclability.The carbon matrix completely encapsulates the SnO2 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 SnO2 QDs@N-C shows excellent capacitive contribution properties,which may be due to the ultra-small size of SnO2 and high conductivity of the carbon matrix.

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