Eutectic nano-droplet template injection into bulk silicon to construct porous frameworks with concomitant conformal coating as anodes for Li-ion batteries.

ABSTRACT: Building porosity in monolithic materials is highly desired to design 3D electrodes, however ex-situ introduction or in-situ generation of nano-scale sacrificial template is still a great challenge. Here Al-Si eutectic droplet templates are uniformly injected into bulk Si through Al-induced solid-solid convection to construct a highly porous Si framework. This process is concomitant with process-inherent conformal coating of ion-conductive oxide. Such an all-in-one method has generated a (continuously processed) high-capacity Si anode integrating longevity and stable electrolyte-anode diaphragm for Li-ion batteries (e.g. a reversible capacity as large as ~1800?mAh/g or ~350??Ah/cm(2)-?m with a CE of ~99% at 0.1?C after long-term 400 cycles).

SUBMITTER: Qu F 

PROVIDER: S-EPMC4437372 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature