Designing solvated double-layer polymer electrolytes with molecular interactions mediated stable interfaces for sodium ion batteries

Designing solvated double-layer polymer electrolytes with molecular interactions mediated stable interfaces for sodium ion batteries

Unstable cathode-electrolyte and/or anode-electrolyte interface in polymer-based sodium-ion batteries (SIBs) will deteriorate their cycle performance. Herein, a unique solvated double-layer quasi-solid polymer electrolyte (SDL-QSPE) with high Na+ ion conductivity is designed to simultaneously improv...

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Bibliographic Details
Main Authors: Pan, Jun, Zhang, Yuchen, Sun, Fu, Osenberg, Markus, Hilger, André, Manke, Ingo, Cao, Ruiguo, Dou, Shi Xue, Fan, Hong Jin
Other Authors: School of Physical and Mathematical Sciences
Format: Journal Article
Language:English
Published: 2023
Subjects:
Engineering::Materials
Double-Layer Polymer Electrolytes
Functional Filler
Online Access:https://hdl.handle.net/10356/165856
Description
Summary:Unstable cathode-electrolyte and/or anode-electrolyte interface in polymer-based sodium-ion batteries (SIBs) will deteriorate their cycle performance. Herein, a unique solvated double-layer quasi-solid polymer electrolyte (SDL-QSPE) with high Na+ ion conductivity is designed to simultaneously improve stability on both cathode and anode sides. Different functional fillers are solvated with plasticizers to improve Na+ conductivity and thermal stability. The SDL-QSPE is laminated by cathode- and anode-facing polymer electrolyte to meet the independent interfacial requirements of the two electrodes. The interfacial evolution is elucidated by theoretical calculations and 3D X-ray microtomography analysis. The Na0.67 Mn2/3 Ni1/3 O2 |SDL-QSPE|Na batteries exhibit 80.4 mAh g-1 after 400 cycles at 1 C with the Coulombic efficiency close to 100 %, which significantly outperforms those batteries using the monolayer-structured QSPE.

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