A Modification of LiMn₂O₄ by Ionic Conductive Agent and Electronic Conductive Agent Coating  

作　　者：Xiaohui Sun Meng Wang Tianming Yuan Jingkang Li Xiaohui Sun;Meng Wang;Tianming Yuan;Jingkang Li(Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China)

机构地区：[1]Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China

出　　处：《Natural Science》2024年第1期1-6,共6页自然科学期刊（英文）

摘　　要：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.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.

关 键 词：Electronic Conduction Ionic Conduction LMO/LSO/C 

分 类 号：TG1[金属学及工艺—金属学]