Open‐Structured V2O5·nH2O Nanoflakes as Highly Reversible Cathode Material for Monovalent and Multivalent Intercalation Batteries. Issue 14 (21st April 2017)

• Record Type: Journal Article
• Authors: Wang, Huali; Bi, Xuanxuan; Bai, Ying; Wu, Chuan; Gu, Sichen; Chen, Shi; Wu, Feng; Amine, Khalil; Lu, Jun
• Is Part Of: Advanced energy materials. Volume 7:Issue 14(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-21
• Subjects: Al‐ion batteries -- Li‐ion batteries -- Na‐ion batteries -- V2O5·nH2O nanoflakes; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201602720
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : The high‐capacity cathode material V2 O5 · n H2 O has attracted considerable attention for metal ion batteries due to the multielectron redox reaction during electrochemical processes. It has an expanded layer structure, which can host large ions or multivalent ions. However, structural instability and poor electronic and ionic conductivities greatly handicap its application. Here, in cell tests, self‐assembly V2 O5 · n H2 O nanoflakes shows excellent electrochemical performance with either monovalent or multivalent cation intercalation. They are directly grown on a 3D conductive stainless steel mesh substrate via a simple and green hydrothermal method. Well‐layered nanoflakes are obtained after heat treatment at 300 °C (V2 O5 ·0.3H2 O). Nanoflakes with ultrathin flower petals deliver a stable capacity of 250 mA h g −1 in a Li‐ion cell, 110 mA h g −1 in a Na‐ion cell, and 80 mA h g −1 in an Al‐ion cell in their respective potential ranges (2.0–4.0 V for Li and Na‐ion batteries and 0.1–2.5 V for Al‐ion battery) after 100 cycles. Abstract : A binder‐free V2 O5 · n H2 O nanoflake cathode, prepared by a simple hydrothermal method, shows decent cyclability and capacity retention for Li +, Na +, and Al 3+ insertion/deinsertion. Water molecules in the oxide network lead to a good ion mobility because of the electrostatic shielding effect. The water‐deficient V2 O5 ·0.3H2 O shows fast kinetics benefiting from the large interlayer spacing and its 3D open structure.