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Organic‐Inorganic Superlattices of Vanadium Oxide@Polyaniline for High‐Performance Magnesium‐Ion Batteries
Author(s) -
Zuo Chunli,
Xiao Yao,
Pan Xiaoji,
Xiong Fangyu,
Zhang Wenwei,
Long Juncai,
Dong Shijie,
An Qinyou,
Luo Ping
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100263
Subject(s) - polyaniline , cathode , materials science , anode , vanadium oxide , oxide , chemical engineering , inorganic chemistry , electrochemistry , electrode , chemistry , composite material , polymer , metallurgy , engineering , polymerization
Rechargeable magnesium batteries (RMBs) have attracted significant attention owing to the high energy density and economic viability. However, the lack of suitable cathode materials, owing to the high polarizability of divalent Mg‐ion and slow Mg‐ion diffusion, hinders the development of RMBs. V 2 O 5 is a promising RMBs cathode material, but its limited interlayer spacing is unfavorable for the rapid diffusion of Mg 2+ , demonstrating unsatisfactory electrochemical performance. In this study, the superlattices of V 2 O 5 and polyaniline (PANI) with expanded interlayer spacing are assembled as the cathode material for RMBs. The intercalation of PANI in the interlayer region of V 2 O 5 significantly improves the reversible capacities, Mg 2+ diffusion kinetics, and cycling performance of the PVO cathode. Furthermore, RMBs with PVO as the cathode and Mg metal as the anode deliver high specific capacities. The introduced polyaniline layer not only expands the interlayer spacing of V 2 O 5 , but also increases the electrical conductivity. Moreover, ex situ XRD characterization indicates that PVO does not undergo obvious phase transformation with the continuous insertion of Mg 2+ , which may be ascribed to the π‐conjugated chains of PANI that give flexibility to the structure to improve cycling stability. This study demonstrates that designing organic‐inorganic superlattices is an efficient strategy for developing high‐performance cathode materials for RMBs.