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Preparation of hierarchical LiNixCoyMnzO2 from solvothermal [NixCoyMnz](OH)2 via regulating the ratio of Ni, Co, and Mn and its excellent properties for lithium‐ion battery cathode
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-06-30 , DOI: 10.1002/jccs.202000051 Xinran Liu 1 , Xinlu Wang 1 , Bin Yue 1 , Guixia Liu 1 , Wensheng Yu 1 , Xiangting Dong 1 , Jinxian Wang 1
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-06-30 , DOI: 10.1002/jccs.202000051 Xinran Liu 1 , Xinlu Wang 1 , Bin Yue 1 , Guixia Liu 1 , Wensheng Yu 1 , Xiangting Dong 1 , Jinxian Wang 1
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The ternary‐layered oxide (LiNixCoyMnzO2) has become the most promising cathode material for lithium‐ion batteries due to the advantages of higher discharge platform, better conductivity, and higher theoretical capacity. The [NixCoyMnz](OH)2 with different ratios of nickel, cobalt, and manganese (NCM) was prepared by solvothermal method, and then ternary cathode material LiNixCoyMnzO2 was obtained by mixing lithium and calcining. In this paper, ternary cathode materials with different ratios of NCM were prepared by the solvothermal method. The structure and morphology of the materials were analyzed by X‐ray diffraction, scanning electron microscopy, and energy‐dispersive spectroscopy. The effects of the ratio on the electrochemical properties of the materials were investigated by constant current charge and discharge test and electrochemical impedance spectroscopy test. The synthesized lithium‐nickel‐cobalt‐manganese oxide belongs to the hexagonal system and has an α‐NaFeO2 layered structure, which is an R‐3m space group. The NCM ternary cathode materials with different morphologies were obtained by changing the ratio of NCM. The sample with NCM ratio of 5:3:2 has a unique sheet‐like spherical shape and has the best rate performance.
中文翻译：
通过调节镍，钴和锰的比例及其溶剂性质，由溶剂热[NixCoyMnz]（OH）2制备分层LiNixCoyMnzO2
由于具有更高的放电平台，更好的电导率和更高的理论容量，三元氧化物（LiNi x Co y Mn z O 2）已成为锂离子电池最有希望的正极材料。通过溶剂热法制备了不同比例的镍，钴和锰（NCM）的[Ni x Co y Mn z ]（OH）2，然后采用三元正极材料LiNi x Co y Mn z O 2。通过将锂混合并煅烧而获得。本文采用溶剂热法制备了不同比例的NCM三元阴极材料。通过X射线衍射，扫描电子显微镜和能量色散光谱分析了材料的结构和形态。通过恒流充放电试验和电化学阻抗谱试验研究了该比例对材料电化学性能的影响。将合成的锂-镍-钴-锰氧化物属于六方晶系，并具有α-NaFeO 2分层结构，是R-3m空间组。通过改变NCM的比例可以得到不同形态的NCM三元阴极材料。NCM比为5：3：2的样品具有独特的片状球形形状，并具有最佳的速率性能。
更新日期：2020-06-30
中文翻译：
通过调节镍，钴和锰的比例及其溶剂性质，由溶剂热[NixCoyMnz]（OH）2制备分层LiNixCoyMnzO2
由于具有更高的放电平台，更好的电导率和更高的理论容量，三元氧化物（LiNi x Co y Mn z O 2）已成为锂离子电池最有希望的正极材料。通过溶剂热法制备了不同比例的镍，钴和锰（NCM）的[Ni x Co y Mn z ]（OH）2，然后采用三元正极材料LiNi x Co y Mn z O 2。通过将锂混合并煅烧而获得。本文采用溶剂热法制备了不同比例的NCM三元阴极材料。通过X射线衍射，扫描电子显微镜和能量色散光谱分析了材料的结构和形态。通过恒流充放电试验和电化学阻抗谱试验研究了该比例对材料电化学性能的影响。将合成的锂-镍-钴-锰氧化物属于六方晶系，并具有α-NaFeO 2分层结构，是R-3m空间组。通过改变NCM的比例可以得到不同形态的NCM三元阴极材料。NCM比为5：3：2的样品具有独特的片状球形形状，并具有最佳的速率性能。
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