Enhanced cycling stability of o-LiMnO2 cathode modified by lithium boron oxide coating for lithium-ion batteries

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

7 Scopus Citations
View graph of relations

Author(s)

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1915-1922
Journal / PublicationJournal of Solid State Electrochemistry
Volume18
Issue number7
Publication statusPublished - Jul 2014

Abstract

The effect of lithium boron oxide (LBO) coating on the electrochemical performance of orthorhombic LiMnO2 (o-LiMnO2) cathode for lithium-ion batteries is investigated. o-LiMnO2 synthesized via solid state synthesis technique is modified with LBO addition. The presence of LBO is identified via Fourier transform infrared spectroscopy analysis. o-LiMnO 2 is observed to transform to a spinel-like phase during cycling which undergoes capacity fading. Studies indicate that the presence of 1-2 wt% LBO results in an improved capacity and better capacity retention with cycling. The pristine sample reveals a maximum specific capacity of 172 mAhg -1, whereas the LBO-modified samples display about 189.1 mAhg -1 in the cycling tests conducted at a rate of 50 mAg-1 in the voltage range of 2-4.5 V. After 70 cycles, the LBO-modified LiMnO 2 displayed higher capacity retention of 175 mAhg-1 as compared to the pristine sample that exhibited 130 mAhg-1. By analyzing the charge-discharge behavior, it is observed that the capacity obtained from lithium insertion into the tetrahedral sites of the spinel structure is more or less constant throughout the cycling and that the bulk of the capacity loss is resulting when lithium is inserted into the octahedral sites of the spinel structure. Impedance measurement reveals a reduced charge-transfer resistance for the LBO-modified samples suggesting that the presence of LBO is countering capacity loss arising from insertion of lithium into the octahedral sites thus contributing to the overall cycling stability. © 2014 Springer-Verlag Berlin Heidelberg.

Research Area(s)

  • Capacity enhancement, Cathode material, Li-ion battery, Lithium boron oxide, Surface coating

Citation Format(s)

Enhanced cycling stability of o-LiMnO2 cathode modified by lithium boron oxide coating for lithium-ion batteries. / Nagasubramanian, Arun; Yu, Denis Yau Wai; Hoster, Harry; Srinivasan, Madhavi.

In: Journal of Solid State Electrochemistry, Vol. 18, No. 7, 07.2014, p. 1915-1922.

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