SITE MAP

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Abstract

Si anode has been regarded as one of the most promising ways for improving the energy density of lithium-ion batteries because of its high specific capacity (3579 mAh/g), proper working voltage (~0.3 V vs Li/Li+), and low material cost. For several decades, numerous strategies based on nanoengineering have been suggested to surmount the intrinsic hurdles of Si from its huge volume change (~300%) upon (de)lithiation and low electrical conductivity, which can cause dead Si with ceaseless side reactions. Gas-phase synthesis utilizing SiH4 has multiple advantages in nanostructuring Si anodes, including convenient downsizing, facile impurity control, and diverse phase engineering. In addition, various Si composites can be devised by uniformly hybridizing nanosized Si and beneficial elements. These specialized merits from gas-phase synthesis can grant striking attributes, such as high cycle efficiency, great mechanical stability, and low electrode swelling. In this talk, I will present a solid overview of the practical development of Si anodes based on gas-phase synthesis, from the first report on the scalable synthesis of Si nanolayer-embedded graphite to the most recent work regarding the subnano-sized Si anode by the crystal growth inhibition. This presentation will also provide the potential future direction to be associated with several elemental technologies for the Si anode.