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Mg 2+ Ion Pre-Insertion Boosting Reaction Kinetics and Structural Stability of Ammonium Vanadates for High-Performance Aqueous Zinc-Ion Batteries
Ist Teil von
ChemSusChem, 2023-08, Vol.16 (15), p.e202300403
Ort / Verlag
Germany
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Aqueous zinc-ion batteries (AZIBs) attract much attention owing to their high safety, environmentally friendliness and low cost. However, the unsatisfactory performance of cathode materials is one of the unsolved important factors for their widespread application. Herein, we report NH
V
O
nanorods with Mg
ion preinsertion (Mg-NHVO) as a high-performance cathode material for AZIBs. The preinserted Mg
ions effectively improve the reaction kinetics and structural stability of NH
V
O
(NHVO), which are confirmed by electrochemical analysis and density functional theory calculations. Compared with pristine NHVO, the intrinsic conductivity of Mg-NHVO is improved by 5 times based on the test results of a single nanorod device. Besides, Mg-NHVO could maintain a high specific capacity of 152.3 mAh g
after 6000 cycles at the current density of 5 A g
, which is larger than that of NHVO (only exhibits a low specific capacity of 30.5 mAh g
at the same condition). Moreover, the two-phase crystal structure evolution process of Mg-NHVO in AZIBs is revealed. This work provides a simple and efficient method to improve the electrochemical performance of ammonium vanadates and enhances the understanding about the reaction mechanism of layered vanadium-based materials in AZIBs.