锂离子电池三元正极材料合成条件研究

　　镍钴锰酸锂三元正极材料由于具有能量密度高和成本低的优点，而在清洁能源和电动汽车等领域有重要应用。但是影响镍钴锰酸锂三元正极材料性质的因素较为复杂，需要进一步研究。
　　本论文通过原位中子粉末衍射技术和软X射线吸收谱等先进表征技术研究了烧结时间与空气/氧气条件对于镍钴锰酸锂正极材料性质的影响。根据实验结果分析了LiNi_0.5Co_0.2Mn_0.3O₂ 正极材料在烧结过程中的晶格结构变化趋势和空气中烧结对镍钴锰酸锂正极材料元素价态的影响。
　　通过对比不同涂布厚度对于电池电化学性能的影响，发现使用200 μm涂布厚度制备电池极片，可以显著提高电池首次库伦效率至80%以上。同时利用原位中子粉末衍射方法，研究LiNi_0.5Co_0.2Mn_0.3O₂ 正极材料合成过程中的晶格结构变化，发现其晶格参数在3.5小时之后基本稳定。但延长烧结时间至12 小时后发现，材料的质量比容量有明显的提升。同时，论文中还对在空气和氧气两种条件下合成的LiNi_0.5Co_0.2Mn_0.3O₂、LiNi_0.6Co_0.2Mn_0.2O₂ 和LiNi_0.8Co_0.1Mn_0.1O₂ 正极材料进行了电化学测试。另外，采用同步辐射光源的软X 射线吸收谱，对合成的正极材料的元素价态进行了测试，得到了不同条件下合成正极材料的吸收谱学数据。

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