保形涂层
材料科学
阳极
碳纤维
锂(药物)
多孔性
化学工程
电化学
涂层
制作
纳米技术
复合数
复合材料
化学
电极
内分泌学
病理
物理化学
工程类
替代医学
医学
作者
Yuexian Li,Jian Song,Yueyan Pan,Chengang Luo,Jizhang Chen,Zhuyin Sui,Qinghua Tian
标识
DOI:10.1016/j.jallcom.2022.168105
摘要
Despite high capacities, the practical use of the Fe3O4-based anodes is still impeded because of poor cyclic performance caused by their large volumetric variation and pulverization during cycle. Aimed at the aforementioned problems, a composite of conformal porous carbon coated Fe3O4 nanospindles (Fe3O4 @PC) has been prepared by a well-designed integration strategy which not only simplifies the experimental steps but also restrains the severe aggregation of nano-sized Fe3O4 during carbon coating process. In particular, the superficially conformal porous carbon is demonstrated to not only accommodate the volumetric variation of the Fe3O4 nanospindles better with its flexible spongy structure but also provide fast and stable diffusion pathways for ions through its defect-enriched pores. With a combination of superficially conformal porous carbon coating, nano-sized one-dimensional structure and Fe–O–C chemical bonding, therefore, the as-prepared Fe3O4 @PC shows outstanding electrochemical behaviors in terms of high capacity, long lifespan and good rate performance, demonstrating 896.3 and 592.9 mA h g−1 after 400 cycles at 200 and 1000 mA g−1, respectively. Moreover, this work is expected to open up new avenues for designing and preparing other conformal porous carbon coated metal oxides for advanced LIB anodes or other applications.
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