刘浩文, 乐 琦, 吴 瑞, 韩小彦.草酸共沉淀法制备三元正极材料及不同沉淀剂的对比[J].中南民族大学学报自然科学版,2018,(2):16-19,53
草酸共沉淀法制备三元正极材料及不同沉淀剂的对比
Preparation of Ternary Cathode Material by Oxalic Acid Coprecipitation Method and Comparison of Different Precipitating Agents
  
DOI:
中文关键词: 共沉淀法  锰酸镍钴锂  氢氧化物  草酸
英文关键词: coprecipitation method  LiNi1/3Co1/3Mn1/3O2  hydroxide  oxalate
基金项目:国家自然科学基金资助项目(2150328)
作者单位
刘浩文, 乐 琦, 吴 瑞, 韩小彦 中南民族大学 化学与材料科学学院, 武汉430074 
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中文摘要:
      为探讨LiNi1/3Co1/3Mn1/3O2更加方便的合成过程,研究了草酸、氢氧化物的共沉淀法,通过XRD表征了不同煅烧温度下材料结构,并探讨了其电化学性能.结果表明:锂离子不能与过渡金属离子通过草酸共沉淀,须进行二次添加,在850 ℃煅烧温度下具有最佳的层状结构.充放电性能测试(2.5~4.3 V, 70 mA·g-1)表明该温度下制备的材料具有最高的初始容量(143.4 mAh·g-1)和较好的循环性能.用草酸盐、碳酸盐、氢氧化物前驱体均能制备出结构良好的正极材料,草酸沉淀法制备的材料容量与氢氧化物沉淀法相当,但容量保持率更高.
英文摘要:
      To develop more convenient synthesis process for LiNi1/3Co1/3Mn1/3O2, oxalic acid and hydroxide coprecipitation methods were studied respectively. The structures of the composites were characterized by XRD, and their electrochemical properties were also investigated. The results showed that Li could not coprecipitate with transition metal ions without the addition of it for a second time. It had the best layered structure at a calcination temperature of 850 ℃. Electrical performance test (2.5—4.3 V; 70 mA·g-1) also confirmed that the material prepared at 850 ℃ had the highest initial capacity (143.4 mAh·g-1) and good cycling performance. Moreover, cathode materials with good structure integrity could be prepared from oxalate, carbonate, and hydroxide precursors. The capacity of oxalic acid precipitated material was equivalent with that obtained from hydroxide, but the former had higher capacity retention rate.
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