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DOI	10.1039/d1ee01158h
	Principles of interlayer-spacing regulation of layered vanadium phosphates for superior zinc-ion batteries
	Hu L.; Wu Z.; Lu C.; Ye F.; Liu Q.; Sun Z.
发表日期	2021
ISSN	17545692
起始页码	4095
结束页码	4106
卷号	14 期号:7
英文摘要	Layered vanadium phosphate (VOPO4·2H2O) is reported as a promising cathode material for rechargeable aqueous Zn2+ batteries (ZIBs) owing to its unique layered framework and high discharge plateau. However, its sluggish Zn2+ diffusion kinetics, low specific capacity and poor electrochemical stability remain major issues in battery application. In this work, a group of phenylamine (PA)-intercalated VOPO4·2H2O materials with varied interlayer spacing (14.8, 15.6 and 16.5 Å) is synthesized respectively via a solvothermal method for the cathode of aqueous ZIBs. The specific capacity is quite dependent on the d-spacing in the PA-VOPO4·2H2O system following an approximate linear tendency, and the maximum interlayer spacing (16.5 Å phase) results in a discharge capacity of 268.2 mA h g-1 at 0.1 A g-1 with a high discharge plateau of ∼1.3 V and an energy density of 328.5 W h kg-1. Both of the experimental data and DFT calculation identify that the optimal 16.5 Å spacing can boost fast zinc-ion diffusion with an ultrahigh diffusion coefficient of ∼5.7 × 10-8 cm-2 s-1. The intercalation of PA molecules also significantly increases the hydrophobility in the aqueous electrolyte, resulting in the inhibition of the decomposition/dissolution of VOPO4·2H2O and remarkably improved cycling stability over 2000 cycles at 5.0 A g-1 with a capacity retention of ∼200 mA h g-1. Our study provides a feasible solution for the sluggish Zn2+ diffusion kinetics and poor cyclic stability, and also shows a clear understanding of the interlayer chemistry principle of layered phosphates toward high-performance zinc-ion batteries. © The Royal Society of Chemistry.
英文关键词	Aniline; Cathodes; Diffusion; Electrolytes; Ions; Phosphates; Secondary batteries; Zinc; Aqueous electrolyte; Battery applications; Chemistry principles; Discharge capacities; Electrochemical stabilities; Interlayer spacings; Specific capacities; Vanadium phosphates; Vanadium compounds; diffusion; fuel cell; inhibition; phosphate; reaction kinetics; spacing; vanadium
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190604
作者单位	School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China; Department of Materials Science, Fudan University, Shanghai, 200433, China
推荐引用方式 GB/T 7714	Hu L.,Wu Z.,Lu C.,et al. Principles of interlayer-spacing regulation of layered vanadium phosphates for superior zinc-ion batteries[J],2021,14(7).
APA	Hu L.,Wu Z.,Lu C.,Ye F.,Liu Q.,&Sun Z..(2021).Principles of interlayer-spacing regulation of layered vanadium phosphates for superior zinc-ion batteries.Energy & Environmental Science,14(7).
MLA	Hu L.,et al."Principles of interlayer-spacing regulation of layered vanadium phosphates for superior zinc-ion batteries".Energy & Environmental Science 14.7(2021).