【摘要】 采用共沉淀法制备前驱体Ni_0.88Co_0.06Mn_0.06（OH）₂,经高温固相烧结合成一次颗粒分散良好的高镍三元材料,探索了氧化锆（ZrO₂）与氧化钨（WO₃）共掺杂对材料一次颗粒的形貌及电化学性能的影响。结果表明,Zr掺杂对Li Ni_0.88Co_0.06Mn_0.06O₂（NCM-Z）一次颗粒的尺寸影响不大,但可以改善材料的循环性能;而引入W形成Zr和W共掺杂后,获得的NCM-ZW一次颗粒明显变小,材料形貌从分散的一次颗粒变成二次颗粒团聚体,因此推测W可抑制晶体生长。为了进一步合成一次颗粒分散良好的Zr和W共掺杂正极材料,研究了烧结温度对一次颗粒生长的影响,最终在900℃下保温12 h,得到了一次颗粒分散良好的Zr和W共掺杂正极材料。XRD结果表明,900℃烧结的Zr和W共掺杂样品具有良好的层状结构与较低的阳离子混排度。该样品在0.1C下首次放电容量为203.7 mAh·g^-1;5C大倍率下容量可达151.2 mAh·g^-1,经过100周循环后,放电容量保持率为84.6%。更多还原

【Abstract】 The precursor Ni_0.88Co_0.06Mn_0.06（OH）₂ was prepared by coprecipitation method.Ni-rich material with good primary particles dispersion were synthesized by high temperature solid-state sintering.The effects of ZrO₂ and WO₃ doped on the primary particles morphology and electrochemical properties of cathode materials was explored.The results showed that Zr doped had little effect on the morphology of LiNi_0.88Co_0.06Mn_0.06O₂（NCM-Z）,especially on the size of primary particles,but it could improve the cycle performance of the material.When W was introduced to form Zr and W co-doped,the primary particles of NCM-ZW obtained become smaller obviously,and the morphology of the material changed from dispersed primary particles to secondary aggregates,so W could inhibit the crystal growth.Furthermore,in order to synthesize Zr and W co-doped Ni-rich material with good primary particles dispersion,the influence of sintering temperature on the synthesis of Ni-rich material was studied.Finally,the Ni-rich material with primary particles dispersion morphology could be obtained by sintering at 900 ℃ for 12 hours.XRD results showed that Zr and W co-doped sample which was sintered at 900 ℃ had batter layered structure and lower cation mixing.The first discharge capacity of the sample was 203.7 mAh·g^-1 at 0.1 C.In addition,the capacity was151.2 mAh·g^-1 at 5C,after 100 cycles,the retention rate of discharge capacity was 84.6%.更多还原