Randomized trial demonstrates improved lithium ion transport in batteries, suggesting enhanced stability and safety.
Key Points
The aim is to improve lithium ion transport and suppress dendrite growth in lithium metal batteries using a novel bilayer separator.
Designed a Janus bilayer separator with two distinct functional layers: sulfonated aramid nanofiber (S-ANF) and quaternary ammonium-functionalized covalent organic framework (N-COF).
Measured lithium ion transference number and ionic conductivity.
Evaluated performance in assembled lithium metal battery cells over multiple cycles.
The S-ANF/N-COF separator achieved a lithium ion transference number of 0.67 and ionic conductivity of 1.39 mS cm−1.
Li||LiFePO4 cells maintained 72.6% capacity after 3000 cycles at 5C and showed 86.3% capacity at 70°C after 100 cycles.
Li||Li symmetric cells demonstrated stable performance with lithium plating/stripping for over 600 hours.