石墨烯
量子点
电池(电)
材料科学
复合材料
纳米技术
复合数
石墨烯量子点
法拉第效率
密度泛函理论
储能
离子
化学工程
电极
化学
电化学
物理
物理化学
热力学
计算化学
工程类
功率(物理)
有机化学
作者
Jinyun Liu,Liying Zhu,Zihan Shen,Min Zhang,Tianli Han,Huigang Zhang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-10-04
卷期号:4 (10): 10998-11003
被引量:7
标识
DOI:10.1021/acsaem.1c01943
摘要
Emerging materials for high-performance Li–S batteries are of great significance. Here, we develop a unique doughnutlike graphene quantum dot (GQD)/Fe2O3@S@SnO2 composite for Li–S batteries. The GQDs are confined inside the yolk–shell structure, which could shorten the pathway for electron and ion transport, enhancing the utilization of sulfur and achieving an energy-storage performance. Both the Fe2O3 core and SnO2 shell display strong binding with Li2S4, Li2S6, and Li2S8, which is verified by using density functional theory calculations. The doughnutlike GQD/Fe2O3@S@SnO2-based Li–S battery displays a capacity of 923 mAh g–1 after cycling 100 times, an ≈100% Coulombic efficiency, and a recoverable rate performance after repeated measurements. The constructed battery possesses a good tolerance at a high temperature of 45 °C. These findings would enable the doughnutlike yolk–shell design to be broadly applied for developing other emerging high-performance materials and their secondary batteries.
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