NaV3O8/poly(3,4-ethylenedioxythiophene) composites as high-rate and long-lifespan cathode materials for reversible sodium storage

Guo-Chun Ding, Li-Min Zhu*, Qi Yang, Ling-Ling Xie, Xiao-Yu Cao, Yu-Ling Wang, Jian-Ping Liu, Xin-Li Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Sodium-ion batteries have received a surge of interests for the alternatives to lithium-ion batteries due to their abundant reserves and low cost. The quest of reliable and high-performance cathode materials is crucial to future Na storage technologies. Herein, poly(3,4-ethylenedioxythiophene) (PEDOT) was successfully introduced to NaV3O8 via in situ oxidation polymerization, which can effectively enhance electron conductivity and ionic diffusion of NaV3O8 material. As a result, these NaV3O8@PEDOT composites exhibit a significantly improved electrochemical performance including cycle stability and rate performance. In particular, NaV3O8@20 wt% PEDOT composite demonstrates better dispersibility and lower charge transfer resistance compared with bare NaV3O8, which delivers the first discharge capacity of 142 mAh·g−1 and holds about 128.7 mAh·g−1 after 300 cycles at a current density of 120 mA·g−1. Even at a high current density of 300 mA·g−1, a high reversible capacity of 99.6 mAh·g−1 is revealed. All these consequences suggest that NaV3O8@20 wt% PEDOT composite may be a promising candidate to serve as a high-rate and long-lifespan cathode material for sodium-ion batteries.

Original languageEnglish
Pages (from-to)865-873
Number of pages9
JournalRare Metals
Volume39
Issue number8
DOIs
Publication statusPublished - Aug 2020

Keywords

  • High-rate
  • In situ oxidation polymerization
  • Long-lifespan
  • NaVO@PEDOT cathode composites
  • Sodium-ion batteries

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