In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries

	In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries
	Song, Xiaohe 1; Liu, Tongchao 1; Amine, Joseph 1; Duan, Yandong 1; Zheng, Jiaxin 1; Lin, Yuan 1,2; Pan, Feng 1
刊名	NANO ENERGY
	2017-07-01
卷号	37 页码:90-97
关键词	Lithium Ion Battery Surface Redox Potential Electrochemical Quartz Crystal Microbalance Density Functional Theory Interfacial Structure
英文摘要	In this work, an in-situ experimental mass-electrochemical investigation of the LiFePO4 (LFP) and NaFePO4 (NFP) electrolyte interfacial chemical reactions and surface redox potential is achieved by adopting electrochemical quartz crystal microbalance (EQCM) to monitor the mass change trend. In organic electrolyte, LFP (NFP) cathode's mass decreases/increases during the charge/discharge process because of deintercalation/intercalation of Li (Na) ions, which is an normal phenomenon which is generally known. However, the mass-potential curve for LFP nanocrystals in aqueous electrolyte show an anomalous mass change interval (AMCI) around 3.42 V (vs. Li/Li+) where the cathode's mass increase in the charging process and mass decrease in the discharging process, which doesn't obey the normal law of mass change. Through density functional theory (DFT) calculations, we gain a microscopic picture of the solid-liquid interface structure with a reconstructed LFP (010)/H2O and NFP (010)/H2O interface. Taken together, it's concluded that the surface redox potential of LFP is around 3.31 V, which is lower than the bulk potential (3.42 V) and the desolvation/solvation rate of surficial Li-ion is lower than the bulk Li-ion diffusion rate. While for NFP, it's surface redox potential is almost the same as the bulk one.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38496]
专题	化学研究所_光化学实验室
作者单位	1.Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China 2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Song, Xiaohe,Liu, Tongchao,Amine, Joseph,et al. In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries[J]. NANO ENERGY,2017,37:90-97.
APA	Song, Xiaohe.,Liu, Tongchao.,Amine, Joseph.,Duan, Yandong.,Zheng, Jiaxin.,...&Pan, Feng.(2017).In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries.NANO ENERGY,37,90-97.
MLA	Song, Xiaohe,et al."In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries".NANO ENERGY 37(2017):90-97.