Open AccessThin NASICON Electrolyte to Realize High Energy Density Solid‐State Sodium Metal Battery
Author(s) -
Oh Jin An Sam,
Xu Xiaoyu,
Zeng Zhihan,
Wang Kexin,
Tan Nicholas Yew Jin,
Kok Eugene,
Huang Jiemin,
Lu Li
Publication year - 2023
Publication title -
energy and environmental materials
Language(s) - English
Resource type - Journals
ISSN - 2575-0356
DOI - 10.1002/eem2.12472
Subject(s) - electrolyte , fast ion conductor , internal resistance , materials science , battery (electricity) , sodium , chemical engineering , electrode , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
The solid‐state electrolyte in a solid‐state battery acts as an electrons' barrier and an ions' bridge between the two electrodes. As solid‐state electrolyte does not store the mobile ions, it is necessary to achieve a thin solid‐state electrolyte to reduce the internal resistance and enhance the energy density. In this work, a thin NASICON solid‐state electrolyte, with a stoichiometry of Na 3 Zr 2 Si 2 PO 12 , is fabricated by the tape‐casting method and its thickness can be easily controlled by the gap between substrate and scraper. The areal‐specific resistance and the flexural strength increase with the electrolyte thickness. A solid‐state sodium metal battery with 86 μm thick Na 3 Zr 2 Si 2 PO 12 exhibits a reversible specific capacity of 73–78 mAh g −1 with a redox potential of 3.4 V at 0.2 C. This work presents the importance of electrolyte thickness to reduce internal resistance and achieve a high energy density for sodium batteries.