Kobayashi Hiroaki, Yamaguchi Kazuya, Honma Itaru
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai Miyagi 980-8577 Japan
Department of Applied Chemistry, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan.
RSC Adv. 2019 Nov 8;9(62):36434-36439. doi: 10.1039/c9ra08626a. eCollection 2019 Nov 4.
Reducing the particle size of cathode materials is effective to improve the rate capability of Mg-ion batteries. In this study, ultrasmall cubic Mg-Mn spinel oxide nanoparticles approximately 5 nm in size were successfully synthesized an alcohol reduction process within 30 min at room temperature. Though the particles aggregated to form large secondary particles, the aggregation could be suppressed by covering the particles with graphene. The composite exhibited a specific capacity of 230 mA h g, and could be cycled more than 100 times without any large capacity loss even at a moderate current density with the Mg(ClO)/CHCN electrolyte.
减小阴极材料的粒径对于提高镁离子电池的倍率性能是有效的。在本研究中，通过室温下30分钟内的醇还原过程成功合成了尺寸约为5nm的超小立方Mg-Mn尖晶石氧化物纳米颗粒。尽管颗粒聚集形成了较大的二次颗粒，但通过用石墨烯覆盖颗粒可以抑制聚集。该复合材料表现出230 mA h g的比容量，并且即使在使用Mg(ClO)/CHCN电解质的中等电流密度下也可以循环100多次而没有任何大的容量损失。
