【摘 要】
:
Microparticulate silicon (Si),normally shelled with carbons,features higher tap density and less interfacial side reactions compared to its nanosized counterpart,showing great potential to be applied as high-energy lithium-ion battery anodes.However,local
【机 构】
:
Nanoyang Group,State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Techn
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Microparticulate silicon (Si),normally shelled with carbons,features higher tap density and less interfacial side reactions compared to its nanosized counterpart,showing great potential to be applied as high-energy lithium-ion battery anodes.However,localized high stress generated during fabrication and particularly,under operating,could induce cracking of carbon shells and release pulverized nanoparticles,significantly deteriorating its electrochemical performance.Here we design a strong yet ductile carbon cage from an easily processing capillary shrinkage of graphene hydrogel followed by precise tailoring of inner voids.Such a structure,analog to the stable structure of plant cells,presents \'imperfection-tolerance\'to volume variation of irregular Si microparticles,maintaining the electrode integrity over 1000 cycles with Coulombic efficiency over 99.5%.This design enables the use of a dense and thick (3 mAh cm-2) microparticulate Si anode with an ultra-high volumetric energy density of 1048 Wh L-1 achieved at pouch full-cell level coupled with a LiNi0.8Co0.1Mn0.1O2 cathode.
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