A novel microstructural reconstruction phenomenon and electrochemical performance of cactus-like SnO2/carbon composites as anode materials for Na-ion batteries

作者：Lu, Xiaoxiao^*; Wu, Guolong^*; Xiong, Qinqin; Qin, Haiying; Ji, Zhenguo; Pan, Hongge

来源：Electrochimica Acta, 2017, 245: 587-596.

DOI：10.1016/j.electacta.2017.05.181

• Na-ion battery
• Tin dioxide
• Amorphous carbon
• SEI

A hydrothermal synthesis and a subsequent carbon coating process have been used to prepare a cactus-like SnO2/carbon composite as anodes for Na-ion batteries. This composite was demonstrated with enhanced cyclability and outstanding electrochemical performance when used as anode for Na-ion batteries. It delivered an initial discharge capacity of 1259 mAh g(-1), and then retained a high reversible capacity of around 500 mAh g(-1) after 50 cycles at a current density of 20 mA g(-1). When the current density increased to 1200 mA g(-1), a reversible capacity of 120 mAh g(-1) can be obtained. Comparing the difference of microstructures before and after cycling, it is found that the cactus-like SnO2/carbon composite presents a novel carbon coating introduced microstructural reconstruction phenomenon. Moreover, the carbon coating was proven to stabilize a spatial cactus structure and induce a high quality solid electrolyte interface (SEI) layer, which effectively enhanced the cyclablity of the cactus-like SnO2/carbon composite. It is believed that carbon coating is an effective way to improve the electrochemical performance of the cactus-like SnO2.

• 出版日期2017-8-10
• 单位浙江工业大学; 浙江大学; 硅材料国家重点实验室; 杭州电子科技大学