In‐Situ Lattice Tunnel Intercalation of Vanadium Pentoxide for Improving Long‐Term Performance of Rechargeable Magnesium Batteries

Abstract

Layered V 2 O 5 is a promising and versatile cathode for rechargeable magnesium batteries (RMBs), but its narrow interlayer spacing makes rapid Mg 2 + diffusion difficult, resulting in poor electrochemical performance. Herein, a facile and scalable technique is established for tailoring the (001) spacing of V 2 O 5 by in-situ polyaniline polymerization. The intercalated polyaniline molecules operate as pillars in the V 2 O 5 interlayer, providing plentiful storage sites as well as improved cation diffusivities of Mg ion. As expected, by using V 2 O 5 /polyaniline as the cathode (anode: Mg metal), a high specific capacity of 361 mAh g À 1 with charging/discharging current density of 20 mA g À 1 can be achieved for RMBs. Besides, V 2 O 5 /polyaniline electrode shows favorable rate capability with 103 mAh g À 1 at 500 mA g À 1 (500 cycles) and ultra long-term cycling performance after 5000 cycles. Ex situ X-ray photoelectron spectroscopy is used to study the magnesium storage mechanism of the V 2 O 5 /polyaniline electrode.

Moving toward high‐energy rechargeable Mg batteries: Status and challenges

“…Also, the crystal water in the aerogel induces a charge-shielding effect which accelerates the Mg 2+ insertion into the electrode while the porous nature of graphene/V 2 O 5 aerogel permits the electrolyte to easily enter the active material. Additionally, Miao et al 53 80 Copyright 2015 Elsevier de-intercalation with high reversible capacity (361 mA h g À1 ) at 20 mA g À1 . The excellent performance of V 2 O 5 /PANI nanosheets can be related to the enlarged interlayer spacing of V 2 O 5 as a result of the PANI intercalation, which provides excess storage sites for Mg 2+ .…”

“…Also, the crystal water in the aerogel induces a charge‐shielding effect which accelerates the Mg 2+ insertion into the electrode while the porous nature of graphene/V 2 O 5 aerogel permits the electrolyte to easily enter the active material. Additionally, Miao et al 53 used in situ polyaniline (PANI) polymerization to tailor the interlayer spacing of layered V 2 O 5 nanosheets. The V 2 O 5 /PANI nanosheets demonstrated excellent Mg 2+ intercalation/de‐intercalation with high reversible capacity (361 mA h g −1 ) at 20 mA g −1 .…”

Interface and electronic structure engineering induced Prussian blue analogues with ultra-stable capability for aqueous NH4+storage

“…Furthermore, the use of flammable and poisonous aprotic solvents raises safety problems. [2][3][4][5] In this scenario, aqueous rechargeable alkalimetal ion (Li + , Na + , Zn 2+ , etc.) [6][7][8] or nonmetallic ion (H + , H 3 O + , NH 4 + , etc.)…”

Structural engineering of bimetallic selenides for high-energy density sodium-ion half/full batteries

“…3 SIBs have become a new generation of energy storage systems that are most likely to replace LIBs because of their plentiful natural resources and environmental friendliness. 4,5 The development and large-scale production of novel anode materials with appropriate performance are critical for SIB use. [6][7][8][9] In recent years, carbon materials, metal oxides/sulfides and alloy materials have been widely studied.…”