Energy-density improvement in li-ion rechargeable batteries based on LiCoO2 + LiV3O8 and graphite + Li-metal hybrid electrodes

Ki Yoon Bae, Sung Ho Cho, Byung Hyuk Kim, Byung Dae Son, Wooyoung Yoon

Research output: Contribution to journalArticle

Abstract

We developed a novel battery system consisting of a hybrid (LiCoO2 + LiV3O8) cathode in a cell with a hybrid (graphite+Li-metal) anode and compared it with currently used systems. The hybrid cathode was synthesized using various ratios of LiCoO2:LiV3O8, where the 80:20 wt% ratio yielded the best electrochemical performance. The graphite and Li-metal hybrid anode, the composition of which was calculated based on the amount of non-lithiated cathode material (LiV3O8), was used to synthesize a full cell. With the addition of LiV3O8, the discharge capacity of the LiCoO2 + LiV3O8 hybrid cathode increased from 142.03 to 182.88 mA h g-1 (a 28.76% improvement). The energy density of this cathode also increased significantly, from 545.96 to 629.24 W h kg-1 (a 15.21% improvement). The LiCoO2 + LiV3O8 hybrid cathode was characterized through X-ray diffraction analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Its electrochemical performance was analyzed using a battery-testing system and electrochemical impedance spectroscopy. We expect that optimized synthesis conditions will enable the development of a novel battery system with an increase in energy density and discharge capacity.

Original languageEnglish
Article number2025
JournalMaterials
Volume12
Issue number12
DOIs
Publication statusPublished - 2019 Jun 1

Keywords

  • High-energy Li-ion cell
  • Lithium cobalt oxide
  • Lithium trivanadate
  • Lithium-metal battery
  • Lithium-metal powder anode

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Energy-density improvement in li-ion rechargeable batteries based on LiCoO<sub>2</sub> + LiV<sub>3</sub>O<sub>8</sub> and graphite + Li-metal hybrid electrodes'. Together they form a unique fingerprint.

  • Cite this