Year: 2025
Type: article
Abstract: Polyethylene oxide (PEO)‐based polymer electrolytes have been considered as the benchmark for developing solid‐state battery systems since the 1970s. However, the limited oxidation stability (<4 V) of the ether oxygen in PEO's polymer structure renders it incompatible with high‐voltage (>4 V) cathodes, which restricts further improvements in the energy density of lithium (Li) or sodium (Na) metal batteries. In this work, we develop a novel type of polymer in a low‐concentrated electrolyte system, Na(TEGDME) 4.1 (PEO) 1.0 (mole ratio of NaFSI:TEGDME:PEO = 1:4.1:1, calculated based on NaFSI mole). For a comparison, a liquid baseline electrolyte, 1 m NaTFSI in tetraglyme (TEGDME) (NaFSI:TEGDME = 1:4.1), were selected to compare with new electrolyte in term of redox stability, thermal stability, and charge‐discharge performance. The hybrid gel electrolyte, Na(TEGDME) 4.1 (PEO) 1.0 , significantly enhanced oxidation stability by raising the onset oxidation potential from 4.0 to 4.2 V in comparing to non‐PEO electrolyte. Additionally, the thermal stability of the gel polymer electrolyte was dramatically higher than that of the liquid electrolyte, with the onset temperature increased by over 75 °C relative to the evaporation temperature of the liquid electrolyte, which begins around 140 °C. The charge–discharge curves of sodium half‐cells indicates that the gel polymer electrolyte exhibited a higher capacity compared to non‐PEO electrolyte.
Source: Vietnam Journal of Chemistry
DOI: 10.1002/vjch.70049
Authors: Hong Phan Nguyen, Thi Diem Phuong Nguyen, Thien Trung Nguyen, Van Hoang Nguyen, Thi Tram Anh Tu, Van Man Tran, My Loan Phung Le, Duy Thanh Vo
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,400
OpenAlex ID: W4412915433