CAJ | 학술논문

通过溶胶?凝胶法合成了含铝富锂正极材料xLi 2 MnO 3·(1?x)LiNi 0.8 Co 0.15 Al 0.05 O 2，探讨了化学组分(x=0.5，0.6，0.7，摩尔分数)和煅烧温度(850，900，950℃)对材料形貌、结构和性能的影响。采用XRD、SEM和电池充放电测试仪对材料进行物理表征和电性能测试。结果表明：所制备的材料具有典型的α-NaFeO 2层状结构。当x=0.6、煅烧温度为900℃时，所合成的材料具有较好的形貌和优良的电化学性能；在2.0~4.6 V、0.1C充放电条件下，0.6Li2MnO3·0.4LiNi0.8Co0.15Al0.05O2的首次放电比容量可达229.9 mA?h/g，且首次库仑效率为80.0%；在0.5C倍率下循环100次后，其放电比容量仍为192.7 mA?h/g，容量保持率达83.8%，显示了优良的循环性能。此外，材料显示了良好的倍率性能，在2.0C倍率下，其放电比容量仍为173.1 mA?h/g。
통과용효?응효법합성료함려부리정겁재료xLi 2 MnO 3·(1?x)LiNi 0.8 Co 0.15 Al 0.05 O 2，탐토료화학조분(x=0.5，0.6，0.7，마이분수)화단소온도(850，900，950℃)대재료형모、결구화성능적영향。채용XRD、SEM화전지충방전측시의대재료진행물리표정화전성능측시。결과표명：소제비적재료구유전형적α-NaFeO 2층상결구。당x=0.6、단소온도위900℃시，소합성적재료구유교호적형모화우량적전화학성능；재2.0~4.6 V、0.1C충방전조건하，0.6Li2MnO3·0.4LiNi0.8Co0.15Al0.05O2적수차방전비용량가체229.9 mA?h/g，차수차고륜효솔위80.0%；재0.5C배솔하순배100차후，기방전비용량잉위192.7 mA?h/g，용량보지솔체83.8%，현시료우량적순배성능。차외，재료현시료량호적배솔성능，재2.0C배솔하，기방전비용량잉위173.1 mA?h/g。
Al-doped Li-rich layeredxLi 2MnO3·(1?x)LiNi0.8Co0.15Al0.05O2cathode materials were synthesized via sol-gel method, and the influence of chemical component (x=0.5, 0.6, 0.7, mole fraction) and calcination temperature (850, 900 and 950℃) on the morphology, structure and performance of the as-prepared materials were discussed. The physical characterization and electrochemical performance test of the as-prepared materials were conducted by means of XRD, SEM and electrochemical measurements. The results demonstrate that the prepared material has a typicalα-NaFeO2 layered structure, and thexLi2MnO3·(1?x)LiNi0.8Co0.15Al0.05O2exhibits the optimal electrochemical performance when the Li contentx is equals to 0.6 and sintering temperature at 900℃. The resultant 0.6Li2MnO3·0.4LiNi0.8Co0.15Al0.05O2sampleshows an high initial discharge capacity of 229.9 mA?h/g and coulomb efficiency of 80.0% for the first time when cycled in the voltage range of 2.0~4.6 V at 0.1C. In addition, the material exhibits good cycling stability with capacity retention of 83.8 % after 100 cycles at 0.5C. Furthermore, the material also shows good rate capability, delivering high discharge capacity of 173.1 mA?h/g at 2.0C.