Lang Zhang , Dong Fang , Fei Wang , Jianhong Yi , Mingjun Wang , Te Hu , Yan Zhao
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引用次数: 0
Abstract
The electrochemical properties of layered vanadate cathode materials for aqueous zinc ion batteries (AZIBs) are still restricted by sluggish reaction kinetics, low conductivity, and poor structural stability. Herein, the Na-doped hydrated NH4V4O10 (NaNVOH) with different contents of interlayered H2O/NH4+ and O-vacancies are obtained with optimized electrostatic interaction between [VOn] framework and H2O/NH4+/Na+ as well as Zn2+ diffusion kinetics. Experimental evidence and theoretical calculations show that the optimal interlayered H2O/NH4+ and more O-vacancies in NaNVOH (NaNVOH2) reinforce the bond strength, narrow the band gap, and promote Zn2+ diffusion coefficients. The reduced H+ insertion hinders cathode/electrolyte interfacial side reaction, ensures sufficient Zn2+ diffusion coefficients at voltage range of 0.6–0.2 V. Meantime, the high electrochemical reversibility of Zn3(OH)2V2O7·2H2O by-product is also validated by in-situ and ex-situ characterizations. As a result, the NaNVOH2 cathode shows a high specific capacity (519 mAh g-1 at 0.5 C, 1 C = 500 mA g−1), good rate capability (236 mAh g-1 at 10 C), and a stable cycling life (without obvious capacity decay over 3000 cycles at 15 C). This study is of great significance for developing high-performance layered vanadate toward the practical application of AZIBs.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.