| 초록 |
Developing a safe, long-lasting Li metal battery is crucial for high-energy applications. However, its poor cycling stability due to Li dendrite formation and excessive Li pulverization is the major hurdle for its practical applications. Here, we present a nanoparticle-dispersed colloidal electrolyte (NDCE). SiO2 nanoclusters in the NDCE play roles in enhancing the Li+ transference number and increasing the Li+ diffusivity. The NDCE enables less-dendritic Li plating by manipulating the nucleation-growth mode. Although selective Li+ transfer of NDCE suppressed Li dendrite growth, the nanoparticle dispersion failed due to self-agglomeration and sedimentation. We further endowed nanoparticles with magnetic field-responsive functionality to remotely control their movement using an external magnetic field. The spatially distributed, rod-like nanospinbars generate a microturbulence of the electrolyte that introduces a complementary mass transport, convection, to alleviate the bottlenecked diffusion without dispersion failure. Convective Li+ transfer enabled by its remote stirring can mitigate the disparity of the concentration gradient and homogenize Li+ flux over the Li surface. |
