In situ TEM characterization of single PbSe/reduced-graphene-oxide nanosheet and the correlation with its electrochemical lithium storage performance
In situ TEM characterization of single PbSe/reduced-graphene-oxide nanosheet and the correlation with its electrochemical lithium storage performance
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单片 PbSe/还原氧化石墨烯纳米片的原位 TEM 表征及其电化学储锂性能的相关性
DOI：
10.1016/j.nanoen.2014.03.001
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发表时间：
2014-04
期刊：
影响因子：
17.6
通讯作者：
X.B. Zhao
中科院分区：
文献类型：
--
作者：
J. Xie;F.F. Tu;Q.M. Su;G.H. Du;S.C. Zhang;T.J. Zhu;G.S. Cao;X.B. Zhao
在这项工作中，应用原位透射电子显微镜（TEM）技术研究了负载在还原氧化石墨烯（rGO）纳米片上的硒化铅（PbSe）纳米晶体的结构和相演变。制备了一种由单片PbSe/rGO阴极、Li2O电解质和Li阳极组成的全固态纳米锂电池，用于实时监测PbSe的电化学锂化/去锂化过程。在原位TEM观测中发现，低层还原氧化石墨烯具有较大的表面积和良好的Li离子和电子导电性，是PbSe的合适载体。基于原位表征，提出了PbSe的锂化/去锂化机理。原位表征结果与PbSe/rGO的电化学性能相关。还原氧化石墨烯对PbSe电化学性能的影响也通过原位TEM表征得到了澄清。
In this work, in situ transmission electron microscopy (TEM) technique has been applied to investigate the structural and phase evolutions of lead selenide (PbSe) nanocrystals loaded on reduced graphene oxide (rGO) nanosheets. An all-solid-state nano lithium battery composed of a single PbSe/rGO sheet cathode, Li2O electrolyte and Li anode has been fabricated to real time monitor the electrochemical lithiation/de-lithiation process of PbSe. It is found that few-layered rGO is a suitable support for PbSe during the in situ TEM observation due to its large surface area and good Li ion and electron conductivity. Based on the in situ characterization, a lithiation/de-lithiation mechanism of PbSe has been proposed. In situ characterization results are correlated with the electrochemical performance of PbSe/rGO. The role that rGO plays in modifying the electrochemical performance of PbSe has also been clarified by the in situ TEM characterization.
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