材料科学
阳极
介孔材料
硅
碳纤维
锂(药物)
化学工程
多孔性
纳米技术
电化学
共聚物
涂层
电极
复合材料
聚合物
催化作用
复合数
化学
有机化学
光电子学
医学
物理化学
工程类
内分泌学
作者
Mingshan Wang,Yu Song,Wei‐Li Song,Li‐Zhen Fan
标识
DOI:10.1002/celc.201402253
摘要
Abstract As a promising anode material for lithium‐ion batteries, Si is still facing great challenges owing to the rapid capacity fade, which is mainly caused by the large volume changes during cycling. We have rationally designed novel 3D porous carbon–silicon frameworks by self‐assembly of the phenol formaldehyde resin and triblock copolymer. The triblock copolymer acts as both structure‐directing agent and template for the formation of a uniform carbon shell and the generation of bimodal porous structures. The as‐fabricated porous carbon–silicon (PC–Si) hybrid exhibits an initial capacity of 1868 mA h g −1 with a columbic efficiency of 41 %. The columbic efficiency rapidly increases to 99 % and the capacity remains at ≈1000 mAh g −1 after 100 cycles suggesting a much more stable cycling and enhanced capacitance compared to Si with direct carbon coating. Such an excellent electrochemical performance is attributed to the formation of continuous mesoporous structures in the exclusive 3D conductive frameworks.
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