One-Pot Synthesis of Carbon-Coated SnO2 Nanocolloids with Improved Reversible Lithium Storage Properties

被引:418
作者
Lou, Xiong Wen [1 ,2 ]
Chen, Jun Song [2 ]
Chen, Peng [2 ]
Archer, Lynden A. [1 ]
机构
[1] Cornell Univ, Sch Chem & Biomol Engn, Ithaca, NY 14853 USA
[2] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637457, Singapore
基金
美国国家科学基金会;
关键词
ION BATTERIES; ANODE MATERIAL; HOLLOW CARBON; ELECTROCHEMICAL PROPERTIES; TIN-NANOPARTICLES; MESOPOROUS SNO2; C COMPOSITE; SPHERES; PERFORMANCE; CAPACITY;
D O I
10.1021/cm900613d
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
We report a simple glucose-mediated hydrothermal method for gram-scale synthesis of nearly monodisperse hybrid SnO2 nanoparticles. Glucose is found to play the dual role of facilitating rapid precipitation of polycrystal line SnO2 nanocolloids and in creating a uniform, glucose-derived, carbon-rich polysaccharide (GCP) coating on the SnO2 nanocores. The thickness of the GCP coating can be facilely manipulated by varying glucose concentration in the synthesis medium. Carbon-coated SnO2 nanocolloids obtained after carbonization of the GCP coating exhibit significantly enhanced cycling performance for lithium storage. Specifically, we find that a capacity of ca. 440 mA h/g can be obtained after more than 100 charge/discharge cycles at a current density of 300 mA/g in hybrid SnO2-carbon electrodes containing as much as 1/3 of their mass in the low-activity carbon shell. By reducing the SnO2-carbon particles with H-2, we demonstrate a simple route to carbon-coated Sn nanospheres. Lithium storage properties of the latter materials are also reported. Our results suggest that large initial irreversible losses in these materials are caused not only by the initial. presumably irreversible, reduction of SnO2 as generally perceived in the field. but also by the formation of the solid electrolyte interface (SEI).
引用
收藏
页码:2868 / 2874
页数:7
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