CAJ | 학술논문

采用固相法制备出镍钴锰三元氧化物LiNi0．5 Co0．2 Mn0．3 O2的单晶材料，然后，进行镁、钛掺杂处理。采用XRD，SEM和恒流充放电等测试手段对材料的晶体结构、形貌和电化学性能等进行研究。测试结果表明，材料形成形貌良好的单晶颗粒，且经过镁、钛掺杂处理后的材料单晶形貌没有改变。掺杂镁、钛后，材料的电化学性能得到明显的改善，LiNi0．5Co0．2Mn0．3O2的单晶材料掺杂镁、钛后容量从159．59 mAh／g提升到162．57 mAh／g，做成全电池后，2 C的放电效率从79．6％提高到了87．3％，1 C下循环300圈后的容量保持率从84．89％提高到92．9％。
채용고상법제비출얼고맹삼원양화물LiNi0．5 Co0．2 Mn0．3 O2적단정재료，연후，진행미、태참잡처리。채용XRD，SEM화항류충방전등측시수단대재료적정체결구、형모화전화학성능등진행연구。측시결과표명，재료형성형모량호적단정과립，차경과미、태참잡처리후적재료단정형모몰유개변。참잡미、태후，재료적전화학성능득도명현적개선，LiNi0．5Co0．2Mn0．3O2적단정재료참잡미、태후용량종159．59 mAh／g제승도162．57 mAh／g，주성전전지후，2 C적방전효솔종79．6％제고도료87．3％，1 C하순배300권후적용량보지솔종84．89％제고도92．9％。
Long-circulating monocrystalline LiNi0.5 Co0.2 Mn0.3 O2 cathode material have been prepared by using high-temperature sintering technique.To improve the rate capacity and conductivity,cathode material was doped with metal Mg and Ti.The crystal structure,morphology and electrochemical properties of the doped samples were characterized by XRD,SEM and galvanostatic charge /discharge.The results show that these particles are single crystal structures,and that the doped material single crystal morphology has not changed.It was found that the modifications could improve electrochemical performances of the original materials effectively.The reversible capac-ity of the doped material increased from159.59mAh/g to162.57mAh/g.The whole cell was shown discharging effi-ciency increased from79.6 % to 87.3 % at 2C rate,and retained 92.9% of initial reversible capacity after 300 galvanostatic cycles at 1 C rate compared with the undoped material retaining 84.89 %.