POS6-0592
Hybrid Polymer Electrolytes with Lithium Silicate for All-Solid-State Lithium Metal Batteries Batteries
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Jihwan Kim (Chonnam National University)
Co-Author(s)
Abstract
All-solid-state lithium metal batteries (ASSLBs) are promising next-generation energy storage systems because of their high safety and potential for high energy density. However, the practical application of polyethylene oxide (PEO)-based solid polymer electrolytes is still limited by high crystallinity, low room-temperature ionic conductivity, and poor compatibility with Li metal. To address these issues, lithium silicate (LS) was incorporated into the PEO matrix to improve electrochemical performance and cycling stability. Among the prepared compositions, the electrolyte containing 5 wt% LS, denoted as LS5, was identified as the optimal formulation because it provided the most favorable ion-transport behavior. The addition of LS effectively reduces PEO crystallinity, lowers the glass transition temperature, and enhances Li⁺ mobility. In addition, LS weakens the ion–dipole interactions between PEO chains and Li⁺ ions, facilitating more efficient ion transport. Its layered silicate structure with exchangeable cations also provides additional Li⁺ migration pathways, which improves the Li transference number and promotes more uniform Li deposition. As a result, the LS5 electrolyte exhibits an ionic conductivity of 8.01 × 10−5 S/cm at room temperature and enables stable Li plating and stripping for 800 h at 0.2 mA/cm² without short circuiting. In full-cell tests, the LFP/LS5/Li cell maintains over 80% capacity retention even at a 5C charge/discharge rate and delivers stable cycling for 1000 cycles at 0.5C, demonstrating excellent rate capability and long-term stability. These results indicate that LS is an effective multifunctional additive for improving ion transport and electrochemical performance in PEO-based solid polymer electrolytes for advanced lithium metal batteries.
