Synthesis and lithium storage properties of Sn quantum dots/graphene composite

被引：0

作者：

Shen D. ^{[1
,2
]}

Chu C. ^{[1
]}

Wang L. ^{[2
]}

Dong W. ^{[1
]}

Liu Y. ^{[1
]}

Li M. ^{[1
]}

Yang S. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Liaoning Technical University, Fuxin

[2] School of Mechanics and Engineering, Liaoning Technical University, Fuxin

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 03期

关键词：

Chemical reduction method; Graphene; Lithium ion battery; Lithium storage property; Sn quantum dot;

D O I：

10.13801/j.cnki.fhclxb.20200826.003

中图分类号：

学科分类号：

摘要：

The Sn-based materials have been a focus as promising high-capacity electrode materials of lithium-ion battery. However, its poor cycling performance has severely restricted the large-scale practical applications. The Sn quantum dot/graphene (SnQds/rGO) composite electrode material was synthesized by chemical reduction method, using graphene oxide as the carrier. The Sn quantum dots with <10 nm were uniformly loaded on the surface of graphene. The experimental results show that the SnQds/rGO composite with Sn mass fraction of 90wt% has good comprehensive electrochemical performance. The first discharge capacity and Coulomb efficiency of the SnQds/rGO composite are 939 mAh/g and 66.6%, respectively. It's discapacity can reach 621 mAh/g after 200 cycles and the capacity retention rate is 66.1%. The structure stability of SnQds/rGO composite is improve, meanwhile its impedance reduce, owing to the commposite of small size Sn quantum dots and graphenethe. As a result, the cycle performance and rate performance of the SnQds/rGO composite have been significantly improved. However, the initial Coulomb efficiency of SnQds/rGO composite decreases. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.

引用

页码：863 / 870

页数：7

共 25 条

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