摘要
本研究以硫酸锰、硫酸钴、硫酸镍、碳酸钠和氟化铵为原料,通过共沉淀法结合高温煅烧法合成氟掺杂富锂锰基正极材料Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(1.92)F_(0.08)。通过扫描电子显微镜(SEM)对样品形貌进行观察,利用X-射线衍射(XRD)技术表征晶体结构,利用X-射线能谱仪(EDS)对样品元素分布进行测试,对材料进行恒电流充放电并研究其电化学性能。结果表明:氟掺杂后的富锂锰基正极材料微观形貌没有发生明显变化并保持层状结构;氟原位掺杂的样品在电流密度为1 C时循环65圈后,放电比容量为179 mAh/g,容量保持率为91.89%,高于未掺杂的样品87.5%,有效改善了材料的循环性能。
The F-doping lithium-rich manganese-based cathode material(LMRF)Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(1.92)F_(0.08) was synthesized by carbonate co-precipitation and high-temperature calcination.The manganese sulfate,cobalt sulfate,nickel sulfate,sodium carbonate,and ammonium fluoride were added in the precursor preparation process.The sample morphology was observed by scanning electron microscope(SEM),and the crystal structure was characterized by X-ray diffraction(XRD) technology.The EDS mapping tested the element distribution of the sample,and the electrochemical performance was studied by galvanostatic charge-discharge cycling.The data shows that the microscopic morphology of the lithium-rich manganese-based cathode material doped with fluorine has not changed significantly,and the layered structure is maintained.The electrochemical data shows that the fluorine-doping sample has a discharge specific capacity of 179 mAh/g and a capacity retention rate of 91.89% after sixtyfive cycles at a current density of 1 C,which is 87.5% higher than that of the undoped sample,which effectively improves the cycle performance of lithium-rich manganese-based materials.
作者
李林
王昊
郭志豪
彭工厂
LI Lin;WANG Hao;GUO Zhihao;PENG Gongchang(Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China)
出处
《合成化学》
CAS
2022年第9期704-708,共5页
Chinese Journal of Synthetic Chemistry
基金
中国科学院2017西部之光青年学者B类
中国科学院“西部之光”人才项目B类。
关键词
锂离子电池正极材料
氟掺杂
碳酸盐共沉淀法
富锂锰基正极材料
合成
lithium-ion battery cathode material
fluorine-doped
carbonate co-precipitation
lithium-rich manganese-based layered material
synthesis
作者简介
第一作者:李林(1994-),男,汉族,山东烟台人,硕士,主要从事富锂锰基材料制备及应用研究;通信联系人:彭工厂,研究员,E-mail:pgc0102@163.com。
