锰源对尖晶石LiMn2O4高温性能的影响
Effects of manganese sources on the high temperature performance of spinel LiMn2O4
作者单位E-mail
刘培松 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
安徽南都华拓新能源科技有限公司, 阜阳 236000 
 
宋利君 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
苏州热工研究院有限公司, 苏州 215004 
 
黄朝连 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  
胡磊 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  
卢晓英 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 jiangqi66@163.com 
江奇 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 luxy2005@swjtu.cn 
摘要: 为考察不同锰源对所制备尖晶石LiMn2O4(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(MnO2、Mn2O3和Mn3O4)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Mn2O3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Mn2O3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。
关键词: 尖晶石LiMn2O4  锰氧化物  电化学储能性能  高温性能
基金项目: 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)和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。
Abstract: To research the effect of different manganese sources on the prepared spinel LiMn2O4 (LMO), the precursors of the manganese sources were prepared by the precipitation method. And then, the most commonly used manganese oxides (MnO2, Mn2O3, and Mn3O4) 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 Mn2O3 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 Mn2O3 exhibited significantly higher rate performance and stronger anti-attenuation ability than the other two LMOs.
Keywords: spinel LiMn2O4  manganese oxide  electrochemical energy storage performance  high temperature performance
投稿时间:2022-06-09 修订日期:2022-10-18
摘要点击次数:  3108
全文下载次数:  421
刘培松,宋利君,黄朝连,胡磊,卢晓英,江奇.锰源对尖晶石LiMn2O4高温性能的影响[J].无机化学学报,2023,39(1):55-62.
查看全文  查看/发表评论  下载PDF阅读器
Support information: