| 초록 |
Dendrite formation during electrodeposition while charging lithium metal batteries compromises their safety. Although high shear-modulus (Gs) solid-ion conductors (SICs) have been prioritized to resolve the pressure-driven instabilities that lead to dendrite propagation and cell shorting, it is unclear whether these or alternatives are needed to guide uniform lithium electrodeposition, which is density-driven. Here, we show that SICs can be designed within a universal paradigm to access pressure-driven dendrite-blocking or density-driven dendrite-suppressing properties. It reflects the competing influence of the SIC’s mechanical properties and the partial molar volume of Li+ (VLi+) relative to those of the lithium anode (GLi and VLi). Within this paradigm, Li plating is uniform as revealed using synchrotron hard X-ray microtomography. The cell cycle life is extended even when assembled with thin Li anodes and high-voltage NMC-622 cathodes or high-capacity sulfur cathodes. |
