【摘要】 采用高离子导电率、电化学惰性的锂铌氧化物对富锂层状材料Li[Li0.2Co0.13Ni0.13Mn0.54]O2进行包覆改性研究.Li[Li0.2Co0.13Ni0.13Mn0.54]O2通过共沉淀-高温固相法合成,不同包覆量的复合材料通过一个简单的化学水解沉积的方法得到.研究了包覆材料的结构随温度变化对其主体材料结构、形貌及电化学性能的影响.XRD测试表明,包覆材料结构从LiNbO3(500℃)、LiNbO3-Li3NbO4(600~700℃)的混合相,到Li3NbO4(800℃)发生递变.包覆材料的电化学循环性能得到提升,混合相存在时尤为显著.更多还原

【Abstract】 High ionic conductive and electrochemical inactive lithium niobium oxides was selected as the modifying material coated on Li[Li0.2Co0.13Ni0.13Mn0.54]O2.Li[Li0.2Co0.13Ni0.13Mn0.54]O2 was synthesized via coprecipitation and solid state reaction and lithium niobium oxides-modified Li[Li0.2Co0.13Ni0.13Mn0.54]O2 was prepared via a chemical deposition method.The effect on the morphology,electrochemical performance of the structure change for the coated material at various calcination temperatures were investigated.XRD studies revealed that the structure of the modifying material was single LiNbO3 phase after being calcined at 500℃ and change to LiNbO3-Li3NbO4 mixture phase at 600 and 700 ℃,and further changed to single Li3NbO4 phase at 800 ℃.The cyclic performance of the coated material was greatly improved especially the LiNbO3-Li3NbO4 mixture phase coexisted.更多还原