八面体形貌及La、Ti共掺杂对锰酸锂的改性研究  

Octahedral morphology and modification of lithium manganate by co-doping of La and Ti

作　　者：马皓皓 陈进中 叶有明 MA Haohao;CHEN Jinzhong;YE Youming(College of Materials Science and Engineering,Guilin University of Technology,Guilin Guangxi 541004,China;Key Laboratory of New Technology for Nonferrous Metals and Materials Processing,Ministry of Education,Guilin University of Technology,Guilin Guangxi 541004,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources,Guilin University of Technology,Guilin Guangxi 541004,China;College of Food and Biochemical Engineering,Guangxi Normal University of Science and Technology,Laibin Guangxi 546199,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]桂林理工大学有色金属及材料加工新技术教育部重点实验室,广西桂林541004 [3]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541004 [4]广西科技师范学院食品与生化工程学院,广西来宾546199

出　　处：《电源技术》2024年第7期1212-1218,共7页Chinese Journal of Power Sources

基　　金：广西科技计划项目(桂科AD20297139);广西科技计划项目(桂科AB22035053);桂林理工大学科研启动基金资助项目(GLUTQ2017099);柳东新区科技计划项目(柳东科攻20210111);来宾市科学研究与技术开发计划项目(来科攻202403);广西科技师范学院科研基金项目(GXKS2020ZD008)。

摘　　要：以高纯四氧化三锰、碳酸锂等为原料,经过高速球磨混合后,采用高温固相法制备LiLa_(0.01)Ti_(0.01)Mn1.98O_(4)正极材料,基于四氧化三锰的八面体形貌及La、Ti共掺杂对锰酸锂的性能进行优化。通过透射电子显微镜(TEM)、X射线衍射(XRD)、扫描电子显微镜(SEM)等表征手段对材料的物相和形貌进行分析,通过X射线光电子能谱仪对Mn的化合价进行分析,通过循环伏安(CV)、恒电流充放电等测试分析材料的电化学性能。结果表明:在1C条件下LiLa_(0.01)Ti_(0.01)Mn1.98O_(4)正极材料首次放电比容量为114.06 mAh/g,循环100次后容量保持率为97.79%,基于八面体形貌,并结合La、Ti共掺杂对锰酸锂协同改性后材料循环性能得到有效改善。Using high-purity manganese tetroxide and lithium carbonate as raw materials,after high-speed ball milling mixing,LiLa_(0.01)Ti_(0.01)Mn1.98O_(4) cathode material was prepared by high-temperature solid phase method,and the performance of lithium manganate was optimized based on the octahedral morphology of manganese tetroxide and the co-doping of La and Ti.The phase and morphology of the material were analyzed by transmission electron microscopy(TEM),X-ray diffraction(XRD),scanning electron microscopy(SEM),etc.,the valence of Mn was analyzed by X-ray photoelectron spectrometer,and the electrochemical properties of the material were analyzed by cyclic voltammetry(CV)and constant current charge and discharge tests.The results show that the first discharge specific capacity of LiLa_(0.01)Ti_(0.01)Mn1.98O_(4) cathode material under 1 C condition is 114.06 mAh/g,and the capacity retention rate is 97.79%after 100 cycles,which is effectively improved based on octahedral morphology and co-doped with lithium manganate by La and Ti.

关 键 词：锂离子电池 正极材料 尖晶石型LiMn_(2)O_(4) 镧钛共掺杂 八面体形貌 

分 类 号：TM912[电气工程—电力电子与电力传动]