石墨烯
材料科学
硅
化学工程
环氧树脂
硅烷
纳米颗粒
锂(药物)
X射线光电子能谱
电解质
阳极
石墨
阴极
纳米技术
复合材料
化学
电极
物理化学
冶金
医学
内分泌学
工程类
作者
Wei Liu,Hong-Ju Li,Jialun Jin,Yizhe Wang,Zheng Zhang,Zidong Chen,Qin Wang,Yungui Chen,Eunsu Paek,David Mitlin
标识
DOI:10.1002/ange.201906612
摘要
Abstract We report a new approach for nanosilicon–graphene hybrids with uniquely stable solid electrolyte interphase. Expanded graphite is gently exfoliated creating “defect‐free” graphene that is non‐catalytic towards electrolyte decomposition, simultaneously introducing high mass loading (48 wt. %) Si nanoparticles. Silane surface treatment creates epoxy chemical tethers, mechanically binding nano‐Si to CMC binder through epoxy ring‐opening reaction while stabilizing the Si surface chemistry. Epoxy‐tethered silicon pristine–graphene hybrid “E‐Si‐pG” exhibits state‐of‐the‐art performance in full battery opposing commercial mass loading (12 mg cm −2 ) LiCoO 2 (LCO) cathode. At 0.4 C, with areal capacity of 1.62 mAh cm −2 and energy of 437 Wh kg −1 , achieving 1.32 mAh cm −2 , 340.4 Wh kg −1 at 1 C. After 150 cycles, it retains 1.25 mAh cm −2 , 306.5 Wh kg −1 . Sputter‐down XPS demonstrates survival of surface C‐Si‐O‐Si groups in E‐Si‐pG after repeated cycling. The discovered synergy between support defects, chemical‐mechanical stabilization of Si surfaces, and SEI‐related failure may become key LIB anode design rule.
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