Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO 4 Anode Material for Sodium-Ion Batteries

Ghulam Ali, Mobinul Islam, Ji Young Kim, Hun Gi Jung, Kyung Yoon Chung

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Sodium-ion batteries are considered the most promising power source for electrical energy storage systems because of the abundance of sodium and their significant cost advantages. However, high-performance electrode materials are required for their successful application. Herein, we report a monoclinic-type CoMoO 4 material which is synthesized by a simple solution method. An optimized calcination temperature with a high crystallinity and a rodlike morphology of the material are selected after analyzing the as-synthesized powder by temperature-dependent time-resolved X-ray diffraction. The CoMoO 4 rods exhibit initial discharge and charge capacities of 537 and 410 mA h g -1 , respectively, when used as an anode for sodium-ion batteries. The sodium diffusion coefficient in the bimetallic CoMoO 4 anode is measured using the galvanostatic intermittent titration technique and calculated in the range of 1.565 × 10 -15 to 4.447 × 10 -18 cm 2 s -1 during the initial cycle. Further, the reaction mechanism is investigated using ex situ X-ray diffraction and X-ray absorption spectroscopy, and the obtained results suggest an amorphous-like structure and reduction/oxidation of Co and Mo during the sodium insertion/extraction process. Ex situ transmission electron microscopy and energy-dispersive spectroscopy images of the CoMoO 4 anode in fully discharged and recharged state reveal the rodlike morphology with homogenous element distribution.

Original languageEnglish
Pages (from-to)3843-3851
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number4
DOIs
StatePublished - 30 Jan 2019

Keywords

  • ex situ XRD
  • monoclinic-type
  • rodlike morphology
  • temperature-dependent
  • X-ray absorption spectroscopy

Fingerprint

Dive into the research topics of 'Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO 4 Anode Material for Sodium-Ion Batteries'. Together they form a unique fingerprint.

Cite this