Issue 6, 2021

High-rate and non-toxic Na7Fe4.5(P2O7)4@C for quasi-solid-state sodium-ion batteries

Abstract

A sustainable and non-toxic polyanionic cathode material is an ideal choice for high-performance eco-friendly sodium-ion batteries (SIBs), but most of the polyanionic cathode materials contain vanadium/chromium or other toxic atoms. Based on Fe atoms, pyrophosphate polyanionic Na7Fe4.5(P2O7)4 is a promising candidate to meet the sustainable, non-toxic and cost-effective requirements. However, its inferior rate capability hinders its further application. Besides, employing quasi-solid-state polymer electrolytes (QSPEs) is an advisable strategy to mitigate the shortcomings of traditional SIBs caused by liquid electrolytes. In light of this, a high-rate carbon-coated Na7Fe4.5(P2O7)4@C (NFPO@C) cathode and a quasi-solid-state polymer electrolyte membrane (PFSA-Na) with high ionic conductivity are provided in this work. Quasi-solid-state full cells based on the NFPO@C cathode, the PFSA-Na membrane and the hard carbon anode can enable high-rate performances and extremely stable cycle life at 20C with a capacity decay of 0.0057% per cycle for 2000 cycles. The NFPO@C cathode material, PFSA-Na membrane and full cells demonstrated here could pave the way for high-rate quasi-solid-state sodium-ion batteries for practical application.

Graphical abstract: High-rate and non-toxic Na7Fe4.5(P2O7)4@C for quasi-solid-state sodium-ion batteries

Supplementary files

Article information

Article type
Research Article
Submitted
04 ربيع الأول 1442
Accepted
18 جمادى الثانية 1442
First published
20 جمادى الثانية 1442

Mater. Chem. Front., 2021,5, 2783-2790

High-rate and non-toxic Na7Fe4.5(P2O7)4@C for quasi-solid-state sodium-ion batteries

G. Du, M. Tao, Y. Qi, W. Gao, S. Bao and M. Xu, Mater. Chem. Front., 2021, 5, 2783 DOI: 10.1039/D0QM00847H

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