摘要
为满足当前新能源发电技术对高比容量电化学储能材料的需求,采用聚合物热解法,通过优化前体聚合过程中金属离子与丙烯酸配比制备高比容量层状富锂锰基氧化物Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2)。依据丙烯酸聚合反应实现金属离子均匀分散,通过二次升温煅烧制备出富锂锰基正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2)。改变煅烧温度,制备不同煅烧温度下的正极材料样品,研究煅烧温度对其微观形貌及电化学性能的影响。利用X射线衍射(XRD)、扫描电镜(SEM)测试技术观测不同材料样品微观形貌和晶体结构的差异,利用能谱分析技术(EDS)观察材料中的元素分布情况,使用新威电池测试系统和电化学工作站对所制备正极材料的电化学性能进行研究。结果表明,在925℃下制备的Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2)正极材料结晶度高,层状结构明显,阳离子混排程度低,各元素分散均匀。在2.0~4.8 V范围循环充放电测试,0.1C倍率下首周放电比容量达到290.3 mAh/g,0.5C倍率下循环充放电100周放电容量保持在204.8 mAh/g,容量保持率为81.9%,具有较好的循环稳定性。本实验制备出的富锂锰基正极材料Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2)具有良好的电化学性能,有助于推动富锂锰基正极材料的应用,为高比容量正极材料的发展提供实验依据。
To meet the current demand for high-specific capacity electrochemical energy storage materials in new energy generation technology,we prepared high-specific capacity layered lithium-rich manganese-based oxide(Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2))by optimizing the proportion of metal ions and acrylic acid in the precursor polymerization process using the polymer-pyrolysis method.Based on the polymerization reaction of acrylic acid to achieve uniform dispersion of metal ions,a Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2) cathode material was prepared by secondary heating and calcination.By changing the calcination temperature to prepare cathode material samples at different calcination temperatures,we studied the effect of calcination temperature on the microstructure and electrochemical performance.We employed testing techniques such as X-ray diffraction and scanning electron microscopy to observe differences in the microstructure and crystal structures of different material samples,energy dispersive spectroscopy to observe the distribution of elements in the materials,and the Xinwei battery testing system and electrochemical workstation to study the electrochemical performance of the prepared cathode material.The results show that the Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2) cathode material prepared at 925℃ has high crystallinity,obvious layered structure,low degree of cation mixing,and uniform dispersion of various elements.During the charge-discharge cycle test in the range of 2.0—4.8 V,the first cycle dischargespecific capacity reached 290.3 mAh/g at a rate of 0.1C.The discharge capacity remained at 204.8 mAh/g for 100 cycles at a rate of 0.5C,with a capacity retention rate of 81.9%,demonstrating good cycling stability.The prepared Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2) cathode material exhibits good electrochemical performance.This study promotes the application of lithium-rich manganese-based oxide cathode materials and provides an experimental basis for developing high-specific capacity cathode mater
作者
缪胤宝
张文华
刘伟昊
王帅
陈哲
彭望
曾杰
MIAO Yinbao;ZHANG Wenhua;LIU Weihao;WANG Shuai;CHEN Zhe;PENG Wang;ZENG Jie(Nanchang Institute of Technology,Nanchang 330000,Jiangxi,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2024年第5期1427-1434,共8页
Energy Storage Science and Technology
基金
国家自然科学基金项目(22269014)
江西省教育厅项目(GJJ211913,GJJ211915)。
关键词
锂离子电池
富锂锰基正极材料
聚合物热解法
电化学性能
lithium ion battery
lithium rich manganese based cathode material
polymerpyrolysis method
electrochemical performance
