POS6-1371
Synergistic Coupling of Host and Electrolyte Achieving 1270 Wh L−1 in Anode-Free Lithium Metal Batteries
When and Where
Nov 30, -0001
00:00 - 00:00
Room 301 (Grand Ballroom)
Presenter(s)
Sang-Won Lee (POSTECH)
Co-Author(s)
Abstract
Anode-free lithium metal batteries (LMBs) represent a promising avenue for maximizing energy density by eliminating excess lithium (Li), yet their practical implementation is impeded by limited Li reversibility and pronounced interfacial instability. Herein, a synergistic coupling strategy is reported that integrates a highly reversible host (RH) with a rationally designed, carbonate-rich electrolyte (DEL) to concurrently address these fundamental challenges. The RH spontaneously induces the formation of a robust Li2O- and Li3N-rich solid electrolyte interphase via electron transfer, which effectively accommodates Li volume changes and suppresses dendritic growth. Complementarily, DEL, composed of commercially available salts, solvents, and additives, establishes stable electrode-electrolyte interphases at both electrodes. Coin-type anode-free full cells employing the RH-DEL configuration achieve an average Coulombic efficiency of 99.6% and 81.9% capacity retention after 100 cycles at 4.6 mAh cm−2 and 2.3 mA cm−2. Stacked pouch-type full cells further deliver a record volumetric energy density of 1270 Wh L−1 (including packaging) under lean electrolyte (E/C = 2.5 g Ah−1) and a low stack pressure (≈20 kPa). This synergistic approach delineates a practical pathway toward high-energy, long-life anode-free LMBs for advanced energy storage systems.
