CAJ | 학술논문

采用喷雾干燥法、共沉淀法、固相法3种方法制备化学计量式为Li1.2Ni0.17Co0.07Mn0.56O2的锂离子电池富锂正极材料。电化学测试表明,喷雾干燥法制备的材料电化学性能最好,0.1 C充放电首圈脱锂和嵌锂容量分别为283.9 mA/（h g）和231.7 mA/（h g）。与共沉淀法和固相法相比较,喷雾干燥法制备的材料1 C倍率充放电时表现出良好的循环稳定性,50次循环后容量没有衰减,仍为153.4 mA/（h g）,共沉淀法和固相法制备的材料50次循环放电容量分别为133.5 mA/（h g）和123.6 mA/（h g）。ICP分析结果指出,喷雾干燥法制备的电极材料元素比例最符合初始的Li1.2Ni0.17Co0.07Mn0.56O2设计配比。而且喷雾干燥法制备的材料颗粒更为细小均匀,有利于提高材料的电化学性能。
채용분무간조법、공침정법、고상법3충방법제비화학계량식위Li1.2Ni0.17Co0.07Mn0.56O2적리리자전지부리정겁재료。전화학측시표명,분무간조법제비적재료전화학성능최호,0.1 C충방전수권탈리화감리용량분별위283.9 mA/（h g）화231.7 mA/（h g）。여공침정법화고상법상비교,분무간조법제비적재료1 C배솔충방전시표현출량호적순배은정성,50차순배후용량몰유쇠감,잉위153.4 mA/（h g）,공침정법화고상법제비적재료50차순배방전용량분별위133.5 mA/（h g）화123.6 mA/（h g）。ICP분석결과지출,분무간조법제비적전겁재료원소비례최부합초시적Li1.2Ni0.17Co0.07Mn0.56O2설계배비。이차분무간조법제비적재료과립경위세소균균,유리우제고재료적전화학성능。
Lithium rich Li1.2Ni0.17Co0.07Mn0.56O2 cathode materials for lithium ion batteries were synthesized by three different methods:a spray-drying method,a co-precipitation method and a solid-state reaction method.Electrochemical tests show that the sample prepared by the spray-drying method presents the best cycling performance with discharge capacity of 153.4 mA?h?g-1 at 1 C rate.No degradation was observed after 50 cycles.While the samples prepared by the co-precipitation method and the solid-state reaction method delivered the capacity of 133.5 mA?h?g-1 and 123.6 mA?h? g-1,respectively,after 50 cycles under 1 C rate charge-discharge.The results of ICP measurements indicate that only the composition of the sample prepared by the spray-drying method can exactly consist with the formula Li1.2Ni0.17Co0.07Mn0.56O2.Furthermore,FSEM observation shows that the sample by spray-drying method has smaller particle size with even particle size distribution,which would benefit its electrochemical performance.