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Silicon (Si) has been regarded as a high-energy replacement for graphite anodes due to its higher gravimetric (∼3579 mAh g –1) and volumetric-(>2000 mAh cm –3) specific capacities for Li 3.75Si at room temperature. Lithium-ion batteries, anode, silicon microparticles, volumetric capacity, mechanical stability INTRODUCTION 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 LiNi 0.8Co 0.1Mn 0.1O 2 cathode. 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%. 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. 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. 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.