Wan Yuanxin, Wang Tianyi, Lu Hongyan, Xu Xiaoqian, Zuo Chen, Wang Yong, Teng Chao
School of Advanced Materials, Peking University Shenzhen Graduate School Shenzhen 518055 China
Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructure, Nanjing University Nanjing 210093 P. R. China.
RSC Adv. 2018 Mar 27;8(21):11744-11748. doi: 10.1039/c8ra00958a. eCollection 2018 Mar 21.
Tin dioxide (SnO) is a promising anode material for lithium-ion batteries owing to its large theoretical capacity (1494 mA h g). However, its practical application is hindered by these problems: the low conductivity, which restricts rate performance of the electrode, and the drastic volume change (400%). In this study, we designed a novel polyacrylamide/SnO nanocrystals/graphene gel (PAAm@SnONC@GG) structure, in which SnO nanocrystals anchored in three-dimensional graphene gel network and the polyacrylamide layers could effectively prevent the agglomeration of SnO nanocrystals, presenting excellent cyclability and rate performance. A capacity retention of over 90% after 300 cycles of 376 mA h g was achieved at a current density of 5 A g. In addition, a stable capacity of about 989 mA h g at lower current density of 0.2 A g was achieved.
二氧化锡（SnO）因其具有较大的理论容量（1494 mA h g），是一种很有前景的锂离子电池负极材料。然而，其实际应用受到以下问题的阻碍：低电导率限制了电极的倍率性能，以及剧烈的体积变化（400%）。在本研究中，我们设计了一种新型的聚丙烯酰胺/SnO纳米晶体/石墨烯凝胶（PAAm@SnONC@GG）结构，其中SnO纳米晶体锚定在三维石墨烯凝胶网络中，聚丙烯酰胺层可以有效防止SnO纳米晶体的团聚，呈现出优异的循环稳定性和倍率性能。在5 A g的电流密度下，376 mA h g的容量在300次循环后容量保持率超过90%。此外，在0.2 A g的较低电流密度下实现了约989 mA h g的稳定容量。
