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Tuning the Kinetics of Zinc‐Ion Insertion/Extraction in V 2 O 5 by In Situ Polyaniline Intercalation Enables Improved Aqueous Zinc‐Ion Storage Performance
Author(s) -
Liu Sucheng,
Zhu He,
Zhang Binghao,
Li Gen,
Zhu Hekang,
Ren Yang,
Geng Hongbo,
Yang Yang,
Liu Qi,
Li Cheng Chao
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202001113
Subject(s) - intercalation (chemistry) , materials science , polyaniline , kinetics , electrochemistry , electrochemical kinetics , aqueous solution , zinc , diffusion , chemical engineering , electrode , inorganic chemistry , chemistry , polymer , composite material , metallurgy , physics , quantum mechanics , engineering , polymerization , thermodynamics
Rechargeable zinc‐ion batteries (ZIBs) are emerging as a promising alternative for Li‐ion batteries. However, the developed cathodes suffer from sluggish Zn 2+ diffusion kinetics, leading to poor rate capability and inadequate cycle life. Herein, an in situ polyaniline (PANI) intercalation strategy is developed to facilitate the Zn 2+ (de)intercalation kinetics in V 2 O 5 . In this way, a remarkably enlarged interlayer distance (13.90 Å) can be constructed alternatively between the VO layers, offering expediting channels for facile Zn 2+ diffusion. Importantly, the electrostatic interactions between the Zn 2+ and the host O 2− , which is another key factor in hindering the Zn 2+ diffusion kinetics, can be effectively blocked by the unique π‐conjugated structure of PANI. As a result, the PANI‐intercalated V 2 O 5 exhibits a stable and highly reversible electrochemical reaction during repetitive Zn 2+ insertion and extraction, as demonstrated by in situ synchrotron X‐ray diffraction and Raman studies. Further first‐principles calculations clearly reveal a remarkably lowered binding energy between Zn 2+ and host O 2− , which explains the favorable kinetics in PANI‐intercalated V 2 O 5 . Benefitting from the above, the overall electrochemical performance of PANI‐intercalated V 2 O 5 electrode is remarkable improved, exhibiting excellent high rate capability of 197.1 mAh g −1 at current density of 20 A g −1 with capacity retention of 97.6% over 2000 cycles.