固相烧结法制备改性LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2三元材料的研究

Research of modified LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 by the preparation of solid-phase sintering

采用固相烧结法,研究不同烧结工艺以及包覆改性处理对LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2三元材料性能的影响。采用XRD、S EM、比表面积、振实密度以及电性能分析,发现以650℃/4 h→780℃/10 h进行第一次烧结后,然后在880℃/8 h复合包覆0.2%纳米级氢氧化镁和0.2%纳米级钛白粉的材料,获得最优的综合电性能,比容量可达156.2 mAh/g,1 C 3.6V放电平台为27 min,50周循环后容量衰减仅有0.93%。

Based on the solid phase sintering method, it is researched the effect of the LiNi0.5Co0.2Mn0.3O2 ternary material by different coating and sintering process. Using XRD, SEM, BET, TD and the electrochemical property analysis, it is found that the material which sintered firstly under 650 ℃/4 h→780 ℃/10 h, and then coated 0.2%nanoscale Mg（OH）2 and 0.2% nanoscale TiO2 at 880 ℃/8 h composite, obtained the optimal electrochamical performance, the specific capacity was up to 156.2 mAh/g, the discharge platform was 27 min and after 50 cycles the capacity decay was only 0.93%.