TITLE:
A Modification of LiMn2O4 by Ionic Conductive Agent and Electronic Conductive Agent Coating
AUTHORS:
Xiaohui Sun, Meng Wang, Tianming Yuan, Jingkang Li
KEYWORDS:
Electronic Conduction, Ionic Conduction, LMO/LSO/C
JOURNAL NAME:
Natural Science,
Vol.16 No.1,
January
23,
2024
ABSTRACT: Carbon was used as electronic conductive agent, and metasilicic acid lithium (Li2SiO3) as ionic conductive agent, the two factors were investigated cooperatively. We evaluated their effect by using spherical spinel LiMn2O4 which prepared ourselves as cathode material. Then Li2SiO3/carbon surface coating on LiMn2O4 (LMO/C/LSO) which Li2SiO3 inside and carbon/Li2SiO3 coated LiMn2O4 (LMO/LSO/C) were prepared, All of materials were characterized by X-ray diffraction (XRD) and electrochemical test; spherical LiMn2O4 was characterized by scanning electron microscopy (SEM); and coated materials were characterized by transmission electron microscopy (TEM). While uncoated spinel LiMn2O4 maintained 72% of capacity in 60 cycles by the rate of 0.2C, and LMO/LSO/C showed the best electrochemical performance, 89% of the initial capacity remained after 75 cycles at 0.2C. Furthermore, the rate performance of LMO/LSO/C also improved obviously, about 30 mAh·g-1 of capacity attained at the rate of 5C, higher than LMO/C/LSO and bare LiMn2O4.