法拉第效率
阳极
硅
材料科学
电解质
电化学
电极
碳纤维
化学工程
锂(药物)
图层(电子)
纳米技术
复合材料
化学
光电子学
复合数
内分泌学
物理化学
工程类
医学
作者
Yu Zhou,Huajun Guo,Zhixing Wang,Xinhai Li,Rong Zhou,Weijia Peng
标识
DOI:10.1016/j.jallcom.2017.07.279
摘要
Silicon anode is a promising candidate for the next generation electrodes for lithium ion batteries. However, the poor cycle performance of silicon caused by large volume expansion of silicon hinders the practical application of silicon anode. The large volume change results in the reformed solid electrolyte interface layer and the electrode/electrolyte interface is unstable. In this work, the native silica and N-doped carbon layer improve the stability of active particles/electrolyte interface and accommodate volume change so as to enhance the electrochemical performance of silicon-based anode material. The temperature has an effect on the growth of the oxide layer and electrochemical performance of electrode material. Superficial silica content on silicon particles increases as the temperature rises, and the cycle properties are improved as well. The sample presents the proper thickness of the silica layer and the composition of the carbon layer at 800 °C. Electrochemical tests show the sample delivers a capacity of 961.9 mAh g−1 at 100 mA g−1, with initial coulombic efficiency of 84.5%. Reversible specific capacity of 775.7 mAh g−1 is obtained at 200 mA g−1 after 50 cycles, with capacity retention of 86.1%. It also exhibits good cycling performance with a reversible capacity of 484.6 mAh g−1 at 1 A g−1 after 200 cycles.
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