Phase regulation enabling dense polymer-based composite electrolytes for solid-state lithium metal batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37813846.
- Also identified by DOI 10.1038/s41467-023-41808-3 and PMC identifier 10562402.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Solid polymer electrolytes with large-scale processability and interfacial compatibility are promising candidates for solid-state lithium metal batteries. Among various systems, poly(vinylidene fluoride)-based polymer electrolytes with residual solvent are appealing for room-temperature battery operations. However, their porous structure and limited ionic conductivity hinder practical application. Herein, we propose a phase regulation strategy to disrupt the symmetry of poly(vinylidene fluoride) chains and obtain the dense composite electrolyte through the incorporation of MoSe<sub>2</sub> sheets. The electrolyte with high dielectric constant can optimize the solvation structures to achieve high ionic conductivity and low activation energy. The in-situ reactions between MoSe<sub>2</sub> and Li metal generate Li<sub>2</sub>Se fast conductor in solid electrolyte interphase, which improves the Coulombic efficiency and interfacial kinetics. The solid-state Li||Li cells achieve robust cycling at 1 mA cm<sup>-2</sup>, and the Li||LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> full cells show practical performance at high rate (3C), high loading (2.6 mAh cm<sup>-2</sup>) and in pouch cell.