| 富锂层状正极材料Li1.2Mn0.54Ni0.13Co0.13O2的二次颗粒粒径对其倍率性能的影响 | |
| Effect of Different Second Particle Size on Rate Capability of Li-Rich Layered Cathode Materials Li1.2Mn0.54Ni0.13Co0.13O2 | |
| 摘要: 采用碳酸盐共沉淀的方法成功制备了不同二次颗粒粒径的富锂层状正极材料Li1.2Mn0.54Ni0.13Co0.13O2。并运用X射线衍射(XRD)、场发射扫描电镜(FESEM)、激光粒度测试和电化学测试等手段对所得材料的结构、形貌、粒度分布及电化学性能进行表征。结果显示,不同二次颗粒粒径的Li1.2Mn0.54Ni0.13Co0.13O2在材料结构上没有明显的差别,且首次放电比容量接近,均达到了281 mAh·g-1。但是,二次颗粒粒径越小,富锂层状材料的表现出的倍率性能越优异,当二次颗粒的D50为4.59μm,其在3C倍率下的放电容量达到了199 mAh·g-1。这是因为二次颗粒粒径越小,富锂层状材料可更好的与导电剂和电解液接触,且锂离子的扩散路径更短,从而表现出更好的倍率特性。 | |
| 关键词: 锂离子电池 正极材料 富锂层状 二次颗粒粒径 电化学性能 | |
| 基金项目: 国家自然科学基金(No.51302017)、北京市科技计划(No.Z121100006712002)、863计划(2012AA110102)资助项目。 | |
| Abstract: Li-rich layered cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 with different second particle size distribution were prepared by carbonate based co-precipitation. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), laser particle size analyze and electrochemical performance tests. The results showed that there were no significant differences in structures between the Li1.2Mn0.54Ni0.13Co0.13O2 materials with different second particle size, and the three samples had similar discharge capacities (281 mAh·g-1) for the first cycle. However, the sample with smaller second particle size showed a much superior rate capability to the sample with bigger particle size. When the D50 of second particle size reduced to 4.59 μm, the sample delivered a discharge capacity of 199 mAh·g-1 at 3C-rate. The improvement in rate capability could be attributed to the smaller particle size, which gives a better contact between the active material and the electrolyte/conductive agent, at the same time a shorter diffusion path. | |
| Keywords: lithium-ion batteries cathode material Li-rich layered second particle size electrochemical performance | |
| 投稿时间：2015-02-02 修订日期：2015-08-27 | |
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| 尹艳萍,卢华权,王忠,孙学义,庄卫东,卢世刚.富锂层状正极材料Li1.2Mn0.54Ni0.13Co0.13O2的二次颗粒粒径对其倍率性能的影响[J].无机化学学报,2015,31(10):1966-1970. | |
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