Scalable synthesis of Na2MVF7 (M = Mn, Fe, and Co) as high-performance cathode materials for sodium-ion batteries

Jiaying Liao; Jingchen Han; Jianzhi Xu; Yichen Du; Yingying Sun; Liping Duan; Xiaosi Zhou

doi:10.1039/d1cc04449d

Scalable synthesis of Na₂MVF₇ (M = Mn, Fe, and Co) as high-performance cathode materials for sodium-ion batteries

Chem Commun (Camb). 2021 Nov 2;57(87):11497-11500. doi: 10.1039/d1cc04449d.

Authors

Jiaying Liao¹, Jingchen Han¹, Jianzhi Xu¹, Yichen Du¹, Yingying Sun¹, Liping Duan¹, Xiaosi Zhou¹

Affiliation

¹ Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China. zhouxiaosi@njnu.edu.cn.

PMID: 34651621
DOI: 10.1039/d1cc04449d

Abstract

We demonstrate an economical polytetrafluoroethylene-assisted fluorination method to synthesize three binary sodium-rich fluorides Na₂MVF₇ (M = Mn, Fe, and Co). The optimal Na₂FeVF₇ cathode delivers a high reversible capacity of 146.5 mA h g^-1 based on active Fe²⁺/Fe³⁺ and V³⁺/V⁴⁺ redox reactions in sodium-ion batteries. A steady cycling performance with a high capacity retention of 95% over 200 cycles is achieved owing to the negligible structural change during Na⁺ insertion/extraction.