锰源对尖晶石LiMn_(2)O_(4)高温性能的影响  

Effects of manganese sources on the high temperature performance of spinel LiMn_(2)O_(4)

作　　者：刘培松 宋利君[1,3] 黄朝连[1] 胡磊 卢晓英[1] 江奇[1] LIU Pei-Song;SONG Li-Jun;HUANG Chao-Lian;HU Lei;LU Xiao-Ying;JIANG Qi(Key Laboratory of Advanced Technologies of Materials(Ministry of Education of China),Superconductivity and New Energy R&D Centre,Southwest Jiaotong University,Chengdu 610031,China;Anhui Nandu Huatuo New Energy Technology Co.,Ltd.,Fuyang,Anhui 236000,China;Suzhou Nuclear Power Research Institute,Suzhou,Jiangsu 215004,China)

机构地区：[1]西南交通大学材料先进技术教育部重点实验室,超导与新能源研究开发中心,成都610031 [2]安徽南都华拓新能源科技有限公司,阜阳236000 [3]苏州热工研究院有限公司,苏州215004

出　　处：《无机化学学报》2023年第1期55-62,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51602266);四川省重点研发项目(No.2021YFG2016);中央引导地方科技发展资金面上项目(No.2021ZYD0066);成都市技术创新研发项目(No.2022-YF05-00320-SN);中央高校基本科研业务费基础研究培育专题研究项目(No.2682020ZT83)资助。

摘　　要：为考察不同锰源对所制备尖晶石LiMn_(2)O_(4)(LMO)电化学性能的影响(特别是高温性能),采用沉淀法制备前驱体,通过不同煅烧温度制备得到最常用的锰氧化物(MnO_(2)、Mn_(2)O_(3)和Mn_(3)O_(4))为锰源,经相同条件制备得到LMO正极材料,通过考察所得LMO形貌及电化学性能来研究锰源与LMO电化学性能的关系。研究结果表明,相同的前驱体在不同煅烧温度下可以得到不同的锰氧化物,且各自具有不同的形貌结构。由这些锰氧化物都可以得到高纯度的LMO,但产物形貌结构以及材料中的八面体晶体含量和尺寸不同。由Mn_(2)O_(3)制备得到的LMO材料中的八面体晶体含量最多,且尺寸最均匀,在3种LMO中容量性能、倍率性能和循环性能最好:0.2C(1C=148 mA·g^(-1))下首次放电比容量为131.8 mAh·g^(-1);3C下还有100.4 mAh·g^(-1)的放电比容量。其对应半电池在0.5C下循环100次后,放电比容量还有116.0 mAh·g^(-1),容量保持率为93.9%,电化学储能性能远远优于其他2种LMO。即使是在高温55℃下,由Mn_(2)O_(3)得到的LMO也表现出明显优于其他2种材料的高倍率性能和抗衰减性能。To research the effect of different manganese sources on the prepared spinel LiMn_(2)O_(4)(LMO),the precursors of the manganese sources were prepared by the precipitation method.And then,the most commonly used manganese oxides(MnO_(2),Mn_(2)O_(3),and Mn_(3)O_(4)) were prepared by different calcination temperatures.The LMO cathode materials were prepared with manganese oxides under the same preparation conditions.And the relationship between manganese sources and the electrochemical performance of the obtained cathode materials was investigated by examining the morphology and electrochemical properties of LMO.The research result showed that different manganese oxides with different morphological structures can be obtained from the same precursor at different calcination temperatures.The morphology structures of LMOs and the contents and sizes of octahedral crystals were different.LMO prepared from Mn_(2)O_(3)had the most octahedral crystals and the most uniform size.It also had the best capacity performance,rate performance,and cycle performance among the three LMOs:the first discharge-specific capacity was 131.8 mAh·g^(-1)(0.2C);the discharge-specific capacity of 100.4 mAh·g^(-1)at 3C;after 100 cycles at 0.5C(half-cell),the discharge specific capacity was still 116.0 mAh·g^(-1),and the capacity retention rate was 93.9%,which is far superior to the other two LMOs,indicating a good application prospect.Even at a high temperature of 55℃,LMO from Mn_(2)O_(3)exhibited significantly higher rate performance and stronger anti-attenuation ability than the other two LMOs.

关 键 词：尖晶石LiMn_(2)O_(4) 锰氧化物 电化学储能性能 高温性能 

分 类 号：TM912[电气工程—电力电子与电力传动]