化工新型材料

化工新型材料 ›› 2017, Vol. 45 ›› Issue (9) : 142-144.

科学研究

锂离子电池正极材料LiNi_0.5Co_0.2Mn_0.3O₂的制备与性能研究

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Synthesis and electrochemical performance of LiNi_0.5Co_0.2Mn_0.3O₂ anode material for lithium-ionic battery

Tian Jiankun¹, Wang Bin², Wan Fucheng¹, Zhang Hailang²

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Received		Published
2017-01-25		2017-10-19
Issue Date	Revised Date
2017-10-19	2017-01-25

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摘要

采用柠檬酸为络合剂,新型无氨共沉淀法合成了LiNi_0.5Co_0.2Mn_0.3O₂材料,通过XRD、CV和电化学性能测试与溶胶-凝胶法和流变相法得到的材料进行对比分析。结果表明,新型无氨共沉淀法得到的材料具有更完美的层状结构,最小的阳离子混排度。电化学测试说明不论是常温还是高温,共沉淀法得到的材料具有最优异的电化学性能;该材料在2.5～4.6V范围内,0.2C时的首次放电比容量为192.0mAh/g(25℃)、217.7mAh/g(55℃),对应的50次循环后的容量保持率分别为94%、86.7%,该材料具有良好的循环稳定性和大倍率放电性能;CV结果显示共沉淀法得到的材料在多次充放电循环后的极化最小。

Abstract

LiNi_0.5Co_0.2Mn_0.3O₂ was synthesized by citric acid as a complexing agent and a new ammonia free coprecipitation method.The XRD,CV and electrochemical property were compared with those obtained by sol-gel method and rheological phase method.The results showed that the material obtained by the new method had a more perfect layered structure,and the smallest cation mixing degree.The electrochemical test showed that the material prepared by the new method had the best electrochemical performance at room temperature and high temperature.When the material was tested during 2.5～-4.6V,the initial discharge specific capacity at 0.2C were 192.0mAh·g^-1(25℃) and 217.7mAh·g^-1(55℃),respectively.The corresponding capacity retention rates after 50 cycles were 94% and 86.7%,and the material had the best cycle stability and high rate discharge performance.The CV result showed that the polarization of the material obtained by the new method was the lowest after repeated cycles.

关键词

锂离子电池 / 高容量 / 无氨共沉淀 / LiNi_0.5Co_0.2Mn_0.3O₂

Key words

lithium-ionic battery / high capacity / ammonia free coprecipitation / LiNi_0.5Co_0.2Mn_0.3O₂

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锂离子电池正极材料LiNi_0.5Co_0.2Mn_0.3O₂的制备与性能研究[J]. 化工新型材料, 2017, 45(9): 142-144 DOI:

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参考文献

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