Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Monika Michalska; Dominika A Buchberger; Jacek B Jasiński; Arjun K Thapa; Amrita Jain

doi:10.3390/ma14154134

Surface Modification of Nanocrystalline LiMn₂O₄ Using Graphene Oxide Flakes

Materials (Basel). 2021 Jul 24;14(15):4134. doi: 10.3390/ma14154134.

Authors

Monika Michalska^{1

2}, Dominika A Buchberger³, Jacek B Jasiński⁴, Arjun K Thapa⁴, Amrita Jain⁵

Affiliations

¹ Department of Chemistry, Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic.
² Łukasiewicz Research Network-Institute of Microelectronics and Photonics, Al. Lotników 32/46, 02-668 Warsaw, Poland.
³ Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
⁴ Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY 40292, USA.
⁵ Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106 Warsaw, Poland.

Abstract

In this work, a facile, wet chemical synthesis was utilized to achieve a series of lithium manganese oxide (LiMn₂O₄, (LMO) with 1-5%wt. graphene oxide (GO) composites. The average crystallite sizes estimated by the Rietveld method of LMO/GO nanocomposites were in the range of 18-27 nm. The electrochemical performance was studied using CR2013 coin-type cell batteries prepared from pristine LMO material and LMO modified with 5%wt. GO. Synthesized materials were tested as positive electrodes for Li-ion batteries in the voltage range between 3.0 and 4.3 V at room temperature. The specific discharge capacity after 100 cycles for LMO and LMO/5%wt. GO were 84 and 83 mAh g^-1, respectively. The LMO material modified with 5%wt. of graphene oxide flakes retained more than 91% of its initial specific capacity, as compared with the 86% of pristine LMO material.

Keywords: LiMn2O4; cathode material; graphene oxide; lithium ion battery; lithium manganese oxide.