SnOxS2-x/GNS nanocomposites for reversible and high-capacity lithium-ion batteries

被引:1
作者
Yang, Ke [1 ]
Yan, Changyu [1 ]
Liu, Xuejiao [1 ]
Chen, Qihan [2 ]
Dong, Boxu [1 ]
Guo, Hongran [1 ]
Qian, Xuefeng [1 ]
机构
[1] Shanghai Jiao Tong Univ, Shanghai Electrochem Energy Devices Res Ctr, Sch Chem & Chem Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[2] Denison Univ, Granville, OH 43023 USA
基金
中国国家自然科学基金;
关键词
GRAPHENE NANOSHEETS; ANODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; SNO2/GRAPHENE COMPOSITE; STORAGE; HETEROSTRUCTURES; CAPABILITY; STABILITY; ELECTRODE; NITROGEN;
D O I
10.1039/d3se00141e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
SnO2 and SnS2 anode materials can improve the cycle stability of tin-based electrodes compared with Sn. However, they usually lead to huge initial irreversible capability and lower initial efficiency. To solve these problems, we reported SnOxS2-x/GNS nanocomposites with a large surface area and small particle size, which can improve the kinetics of the electrochemical reactions and realize a reversible Li+ storage process. The obtained SnOxS2-x/GNS nanocomposites (x = 0.3-1.3) have homogenously anchored on graphene nanosheets, which consists of a single phase (SnO2 or SnS2) nanocrystal (3-5 nm) and are surrounded by large amorphous areas. This unique structure makes the Li+ storage process of the obtained nanocomposites fully reversible. Specifically, the SnOS/GNS nanocomposite exhibits a good cycling performance of 1066 mA h g(-1) at 0.2 A g(-1) after 50 cycles and a rate capability of 402 mA h g(-1) at 2 A g(-1).
引用
收藏
页码:1839 / 1845
页数:7
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