Synergy of Epoxy Chemical Tethers and Defect-Free Graphene in Enabling Stable Lithium Cycling of Silicon Nanoparticles.

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ID: 54372
2019
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Ranked #35 of 192 articles by views in angewandte chemie (international ed in english)

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摘要
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 ) LiCoO (LCO) cathode. At 0.4 C, with areal capacity of 1.62 mAh cm and energy of 437 Wh kg , achieving 1.32 mAh cm , 340.4 Wh kg at 1 C. After 150 cycles, it retains 1.25 mAh cm , 306.5 Wh kg . 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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liu2019synergyangewandte 使用此键在稿件中自动引用，同时使用 SciMatic 稿件管理器或论文管理器
作者 Liu, Wei;Li, Hongju;Jin, Jialun;Wang, Yizhe;Zhang, Zheng;Chen, Zidong;Wang, Qin;Chen, Yungui;Paek, Eunsu;Mitlin, David;
期刊 angewandte chemie (international ed in english)
年份 2019
DOI
10.1002/anie.201906612
URL
关键词
surface chemistry silicon coulombic efficiency graphene defects solid electrolyte interphase (sei)

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