材料科学
阳极
石墨
电极
锂(药物)
锂离子电池
制作
纳米技术
碳纤维
电导率
电化学
电池(电)
化学工程
复合材料
电解质
复合数
病理
物理化学
功率(物理)
医学
化学
替代医学
物理
量子力学
内分泌学
工程类
作者
Quan Xu,Jiankun Sun,Ya‐Xia Yin,Yu‐Guo Guo
标识
DOI:10.1002/adfm.201705235
摘要
Abstract SiO x ‐containing graphite composites have aroused great interests as the most promising alternatives for practical application in high‐performance lithium‐ion batteries. However, limited loading amount of SiO x on the surface of graphite and some inherent disadvantages of SiO x such as huge volume variation and poor electronic conductivity result in unsatisfactory electrochemical performance. Herein, a novel and facile fabrication approach is developed to synthesize high‐performance SiO x /C composites with graphite‐like structure in which SiO x particles are dispersed and anchored in the carbon materials by restoring original structure of artificial graphite. The multicomponent carbon materials are favorable for addressing the disadvantages of SiO x ‐based anodes, especially for the formation of stable solid electrolyte interphase, maintaining structural integrity of electrode materials and improving electrical conductivity of electrode. The resultant SiO x /C anodes demonstrate high reversible capacities (645 mA h g −1 ), excellent cycling stability (≈90% capacity retention for 500 cycles), and superior rate capabilities. Even at high pressing density (1.3 g cm −3 ), SiO x /C anodes still present superior cycling performance due to the high tap density and structural integrity of electrode materials. The proposed synthetic method can also be developed to address other anode materials with inferior electronic conductivity and huge volume variation.
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