三元正极材料的草酸共沉淀法制备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
投稿时间:2017-09-22  修订日期:2017-10-17
DOI:
中文关键词: 共沉淀法  LiNi1/3Co1/3Mn1/3O2  氢氧化物  草酸
英文关键词: Coprecipitation method  LiNi1/3Co1/3Mn1/3O2  Hydroxide  Oxalate
基金项目:
作者单位E-mail
刘浩文 中南民族大学 liuhwchem@mail.scuec.edu.cn 
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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、氢氧化物等不同沉淀剂的共沉淀法,通过XRD表征了不同煅烧温度下材料结构,电化学性能测试结果表明: 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)表明该温度下制备的材料具有最高的初始容量(143.4 mAh/g)和较好的循环性能。用草酸盐前驱体、碳酸盐前驱体、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 discuss more convenient synthesis process of LiNi1/3Co1/3Mn1/3O2, oxalic acid, and hydroxide precipitants coprecipitation method were studied. The structures of the composites were characterized by XRD, and their electrochemical properties were compared by electrochemical test. The results showed that Li could not coprecipitate with transition metal ions through oxalic without secondary addition. It had the best layered structure at calcination temperature of 850 ℃. Electrical performance test (2.5~4.3 V; 70 mA/g) also confirmed that the prepared material at 850 ℃ had the highest initial capacity (143.4 mAh/g) and good cycling performance. Moreover, cathode materials with good structure could be prepared by oxalate precursor, carbonate precursor,and hydroxide precursors. The material capacity of oxalic acid precipitation was equivalent with the hydroxide precipitation method, but the former had higher capacity retention rate.
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