Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes.

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

doi:10.3390/ma14154134

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.

Highlights

The discovery of new innovative materials as well as adding new functionalities to well-known materials using various “bottom up” and “top down” techniques is highly important from the practical point of view for various applications, including the energy sector [1,2,3,4,5,6,7]
For the first time in this work, we demonstrate the wet chemical and low temperature technique of the surface modification of the cathode material LiMn2 O4 with graphene oxide flakes
We reported a facile, wet chemical synthesis of surface modification of LMO grains with graphene oxide flakes

Summary

Introduction

The discovery of new innovative materials as well as adding new functionalities to well-known materials using various “bottom up” and “top down” techniques is highly important from the practical point of view for various applications, including the energy sector [1,2,3,4,5,6,7]. The development of energy technologies, especially renewable energy and energy storage systems will play a key role in urgently needed de-carbonization and transition to a low-emission economy. The importance of these technologies has been recognized in recent years. LiBs are used to store energy from renewable sources, such as solar and wind power [8,9,10,11,12,13,14,15,16,17]

Methods

Results

Conclusion