Probing Structural Evolution and Charge Storage Mechanism of NiO2H x Electrode Materials using In Operando Resonance Raman Spectroscopy

Dongchang Chen; Xunhui Xiong; Bote Zhao; Mahmoud A Mahmoud; Mostafa A El-Sayed; Meilin Liu

doi:10.1002/advs.201500433

Probing Structural Evolution and Charge Storage Mechanism of NiO₂H _x Electrode Materials using In Operando Resonance Raman Spectroscopy

Adv Sci (Weinh). 2016 Feb 23;3(6):1500433. doi: 10.1002/advs.201500433. eCollection 2016 Jun.

Authors

Dongchang Chen¹, Xunhui Xiong², Bote Zhao², Mahmoud A Mahmoud³, Mostafa A El-Sayed³, Meilin Liu²

Affiliations

¹ School of Materials Science and Engineering Center for Innovative Fuel Cell and Battery Technologies Georgia Institute of Technology 771 Ferst Drive Atlanta GA 30332-0245 USA; Laser Dynamics Laboratory School of Chemistry and Biochemistry Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332-0400 USA.
² School of Materials Science and Engineering Center for Innovative Fuel Cell and Battery Technologies Georgia Institute of Technology 771 Ferst Drive Atlanta GA 30332-0245 USA.
³ Laser Dynamics Laboratory School of Chemistry and Biochemistry Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332-0400 USA.

Abstract

In operando resonance Raman spectroscopy suggests quantitative correlation between phonon band properties and the amount of charge storage of high-energy density NiO₂H _x battery/pseudocapacitive material. Comparing the spectroscopic evolution using different electrolytes reveals the contributions of breaking/formation of O-H bonds and insertion/extraction of cations to electrochemical charge storage of NiO₂H _x .

Keywords: battery; nickel hydroxide/oxo‐hydroxide; reaction mechanisms; resonance Raman spectroscopy; supercapacitor.