纳米点
催化作用
热解
硅
分散性
材料科学
氢化锂
锂(药物)
星团(航天器)
纳米技术
离子
纳米尺度
化学工程
碳纤维
光电子学
化学
有机化学
离子键合
高分子化学
复合材料
内分泌学
工程类
程序设计语言
复合数
计算机科学
医学
作者
Bingjie Chen,Lianhai Zu,Yao Liu,Ruijing Meng,Yutong Feng,Chengxin Peng,Feng Zhu,Tianzi Hao,Jiajia Ru,Yonggang Wang,Jinhu Yang
标识
DOI:10.1002/anie.201915502
摘要
Incorporating nanoscale Si into a carbon matrix with high dispersity is desirable for the preparation of lithium-ion batteries (LIBs) but remains challenging. A space-confined catalytic strategy is proposed for direct superassembly of Si nanodots within a carbon (Si NDs⊂C) framework by copyrolysis of triphenyltin hydride (TPT) and diphenylsilane (DPS), where Sn atomic clusters created from TPT pyrolysis serve as the catalyst for DPS pyrolysis and Si catalytic growth. The use of Sn atomic cluster catalysts alters the reaction pathway to avoid SiC generation and enable formation of Si NDs with reduced dimensions. A typical Si NDs⊂C framework demonstrates a remarkable comprehensive performance comparable to other Si-based high-performance half LIBs, and higher energy densities compared to commercial full LIBs, as a consequence of the high dispersity of Si NDs with low lithiation stress. Supported by mechanic simulations, this study paves the way for construction of Si/C composites suitable for applications in future energy technologies.
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