Boosting capacity and operating voltage of LiVO3 as cathode for lithium-ion batteries by activating oxygen reaction in the lattice

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number230728
Journal / PublicationJournal of Power Sources
Volume517
Online published7 Nov 2021
Publication statusPublished - 1 Jan 2022

Abstract

Capacity and operating voltage are critical parameters of cathode materials that dictate the energy density of lithium-ion batteries. Traditionally, redox reaction of the transition metal in the cathode limits the operating voltage and capacity during charge/discharge. Here, we simultaneously increase the capacity and operating voltage of LiVO3 by utilizing the anionic redox reaction of oxygen in the lattice. While LiVO3 gives a capacity of 235 mAh g−1 with an average potential of 2.18 V vs. Li/Li+ between 1.5 and 3.0 V from the vanadium redox reaction, they increase to 358 mAh g−1 and 2.55 V vs. Li/Li+, respectively, between 1.5 and 4.8 V. The higher capacity and operating voltage are due to the extraction of 0.56 mol of Li from its lattice when charging it to 4.8 V, despite vanadium originally in its highest oxidation state of 5+. The additional charge transfer derives from oxygen in the material, as X-ray spectroscopies and density functional theory calculation demonstrate the presence of peroxide species in the material and spin density around oxygen atoms, respectively, upon lithium extraction. Structural and gas analyses further reveal the stability of the anionic reaction, with only 0.21% volume change during lithium extraction with no O2 gas release.

Research Area(s)

  • Anionic redox reaction, Cathode material, Lithium ion batteries, Lithium vanadium oxide, Structural stability, Tetrahedral coordination

Citation Format(s)

Boosting capacity and operating voltage of LiVO3 as cathode for lithium-ion batteries by activating oxygen reaction in the lattice. / Su, Bizhe; Wu, Shuilin; Liang, Hanqin; Gu, Qinfen; Wang, Huimin; Zhou, Wenchong; Zhao, Xiaohui; Zhang, Tao; Sit, Patrick H.-L.; Zhang, Wenjun; Yu, Denis Y.W.

In: Journal of Power Sources, Vol. 517, 230728, 01.01.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review