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Title: Water-Pillared Sodium Vanadium Bronze Nanowires for Enhanced Rechargeable Magnesium Ion Storage

Journal Article · · Small
 [1];  [2];  [3];  [2];  [4];  [2];  [2];  [4]; ORCiD logo [2]
  1. University of Maryland, College Park, MD (United States); Wuhan University of Technology (China)
  2. University of Maryland, College Park, MD (United States)
  3. George Mason University, Fairfax, VA (United States)
  4. Wuhan University of Technology (China)
+ Show Author Affiliations

Abstract Owing to the advantages of high safety, low cost, high theoretical volumetric capacities, and environmental friendliness, magnesium‐ion batteries (MIBs) have more feasibility for large‐scale energy storage compared to lithium‐ion batteries. However, lack of suitable cathode materials due to sluggish kinetics of magnesium ion is one of the biggest challenges. Herein, water‐pillared sodium vanadium bronze nanowires (Na 2 V 6 O 16 ·1.63H 2 O) are reported as cathode material for MIBs, which display high performance in magnesium storage. The hydrated sodium ions provide excellent structural stability. The charge shielding effect of lattice water enables fast Mg 2+ diffusion. It exhibits high specific capacity of 175 mAh g −1 , long cycle life (450 cycles), and high coulombic efficiency (≈100%). At high current density of 200 mA g −1 , the capacity retention is up to 71% even after 450 cycles (compared to the highest capacity), demonstrating excellent long‐term cycling performance. The nature of charge storage kinetics is explored. Furthermore, a highly reversible structure change during the electrochemical process is proved by comprehensive electrochemical analysis. The remarkable electrochemical performance makes Na 2 V 6 O 16 ·1.63H 2 O a promising cathode material for low‐cost and safe MIBs.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); George Mason University; China Post-doctoral Science Foundation; Central Universities
Grant/Contract Number:
EE0008202; 183904; 2018M642938; 2019T120691; 120619324
OSTI ID:
1799449
Alternate ID(s):
OSTI ID: 1634862
Journal Information:
Small, Vol. 16, Issue 30; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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36 MATERIALS SCIENCE
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
cathodes
magnesium-ion batteries
nanowires
sodium vanadium bronze