用于锂离子电池阳极的高质量石墨烯负载SnS异质结的高性能及再激活特性

High-Performance and Reactivation Characteristics of High-Quality, Graphene-Supported SnS Heterojunctions for a Lithium-Ion Battery Anode.

作者信息

Li Jianhui, Han Shaobo, Zhang Chenyu, Wei Wei, Gu Meng, Meng Lingjie

机构信息

Department of Materials Science and Engineering, and Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices , Southern University of Science and Technology , Shenzhen 518055 , China.

Department of Materials Science and Engineering , University of Wisconsin-Madison , 1509 University Avenue , Madison , Wisconsin 53706 , United States.

出版信息

ACS Appl Mater Interfaces. 2019 Jun 26;11(25):22314-22322. doi: 10.1021/acsami.9b04243. Epub 2019 Jun 13.

DOI:10.1021/acsami.9b04243

PMID:31190523

Abstract

SnS has received tremendous attention as an anode material for lithium-ion batteries owing to its high theoretical capacity and low cost. However, its applications are limited by its inferior cycling stability and poor rate performance. In this study, graphene@SnS heterojunction nanocomposites are synthesized using a microwave-assisted solvothermal approach on liquid-phase exfoliated graphene (LEGr). Compared with graphene oxides, LEGr layers with an intrinsic atomic structure show extraordinary conductivity and serve as robust substrates for in situ growth of SnS with improved interfacial contact. A LEGr-derived SnS hybrid shows remarkable storage capacity, superior rate capability, and excellent cycling stability. The storage capacity remains at 664 mAh g after 200 cycles at 300 mA g current density. Furthermore, lithiation-induced reactivation of LEGr-based SnS is investigated using in situ transmission electron microscopy, giving an in-depth explanation of the electrochemical reaction mechanisms.

摘要

由于具有高理论容量和低成本，硫化锡（SnS）作为锂离子电池的负极材料受到了广泛关注。然而，其应用受到较差的循环稳定性和倍率性能的限制。在本研究中，采用微波辅助溶剂热法在液相剥离石墨烯（LEGr）上合成了石墨烯@SnS异质结纳米复合材料。与氧化石墨烯相比，具有固有原子结构的LEGr层表现出非凡的导电性，并作为原位生长SnS的坚固基底，改善了界面接触。由LEGr衍生的SnS杂化物表现出显著的存储容量、优异的倍率性能和出色的循环稳定性。在300 mA g电流密度下循环200次后，存储容量保持在664 mAh g。此外，利用原位透射电子显微镜研究了基于LEGr的SnS的锂化诱导再活化，深入解释了电化学反应机理。