摘要
目前,新型正极材料的研究主要集中于提高材料的能量密度和安全性等。其中,单晶型镍钴锰三元材料具有耐高压、高热力学稳定性和高循环稳定性等优异的综合性能,是极具发展前景的正极材料之一。采用LiOH作为熔盐、添加LiNO_(3)助熔剂降低熔点,烧结制备单晶LiNi_(0.75)Co_(0.10)Mn_(0.15)O_(2)材料。结果表明,当烧结温度为860℃、前驱体与混合锂盐的物质的量比为1∶2时,所合成的单晶正极材料的Li+/Ni^(2+)混排率较低,晶体颗粒粒径为1.5~2.5μm。该材料具有良好的循环稳定性,首圈放电容量为172.3 mAh/g,在常温、2.8~4.4 V内,以1C倍率循环100次后,其容量保持率可达86.3%。
At present,the development of new cathode materials is mainly devoted to improving their energy density and safety.The single crystal nickel-cobalt-manganese ternary material has become one of the most promising cathode materials,due to its unique properties such as high safety,good thermodynamic and cycle stability.In this paper,single crystal LiNi_(0.75)Co_(0.10)Mn_(0.15)O_(2)materials were synthesized via LiNO_(3)-LiOH molten-salt assisted sintering,in which the LiOH was used as molten salt and LiNO_(3)was used as cosolvent to reduce melting temperature.Lower cation mixing of Li+/Ni^(2+)and homogeneous particle with the size of 1.5—2.5μm were simultaneously obtained by sintering the mixture at 860℃with the molar ratio of precursor to lithium salt of 1∶2.The optimized sample yields high initial capacity of 172.3 mAh/g,and good cycle stability with capacity retention of 86.3%after 100 cycles(2.8—4.4 V,1C)at room temperature.
作者
虞亚霖
莫岩
陈永
李德
YU Yalin;MO Yan;CHEN Yong;LI De(Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources,State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,China;School of Materials Science and Hydrogen Energy,Foshan University,Foshan 528000,Guangdong,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第4期10-15,共6页
Materials Reports
基金
海南省重点研发项目(ZDYF2020028)
国家自然科学基金(52062012)。
