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首页> 外文期刊>Nano Energy >In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries
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In-situ mass-electrochemical study of surface redox potential and interfacial chemical reactions of Li(Na)FePO4 nanocrystals for Li(Na)-ion batteries

机译:原位大规模电化学研究Li(Na)FEPO的表面氧化还原电位和界面化学反应 4 LI(NA)电池的纳米晶体

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Abstract 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 3.42V (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 3.31V, which is lower than the bulk potential (3.42V) 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. 展开▼
机译:<![cdata [ 抽象 在这项工作中,一个原位实验性质量电化学调查Lifepo 4 4 (NFP)电解质界面化学反应和表面氧化还原电位是通过采用电化学石英晶体微稳定(EQCM)来监测的大规模变化趋势。在有机电解质中,由于Li(Na)离子的脱嵌/插入,LFP(NFP)阴极的质量在充电/放电过程中减少/增加,这是一种通常已知的正常现象。然而,水性电解质中LFP纳米晶体的质量势曲线显示出大约3.42 V(与Li / Li + ”,其中阴极在充电过程中的质量增加和放电过程中的质量下降,这不会遵循质量变化的正常规律。通过密度泛函理论(DFT)计算,我们利用重建的LFP(010)/ H 2 O和NFP (010)/ h 2 O接口。总之,结论是LFP的表面氧化还原电位约为3.31 V,其低于散装电位(3.42 V)表面锂离子的脱溶解/溶剂化率低于本体锂离子扩散速率。虽然对于NFP,它的表面氧化还原电位几乎与批量一致相同。

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