| 锂离子电池正极材料铌掺杂LiNiO2 的制备与电化学性能 |
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| 引用本文： | 黄丽颖,陆冬楚,宁玉雪,胡婷婷,陈晴,黄国欣,苏静,文衍宣. 锂离子电池正极材料铌掺杂LiNiO2 的制备与电化学性能[J]. 无机盐工业, 2022, 54(11): 52-58. DOI: 10.19964/j.issn.1006-4990.2022-0270 |
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| 作者姓名： | 黄丽颖 陆冬楚 宁玉雪 胡婷婷 陈晴 黄国欣 苏静 文衍宣 |
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| 作者单位： | 广西大学化学化工学院，广西 南宁 530004 |
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| 基金项目： | 国家自然科学基金资助项目(51864005);广西自然科学基金(2018GXNSFDA281014);广西大学生创新实验项目(202110593197) |
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| 摘 要： | 为了提高LiNiO2的电化学性能，用固相反应法制备了铌掺杂LiNiO2材料，并用X射线衍射（XRD）分析、恒电流滴定技术（GITT）、电化学阻抗谱（EIS）等方法研究铌掺杂量对LiNiO2的结构和性能的影响。结果表明适量的铌（Nb）掺杂可以提高LiNiO2层状结构的有序程度，降低Li+/Ni2+混合程度，降低电荷转移阻抗，提高活性材料中锂离子的扩散系数。其中LiNi0.99Nb0.01O2在0.5C循环100次的容量保持率为91.4%，5C时放电比容量为143 mA·h/g。而未掺杂铌的LiNiO2在相同条件下的容量保持率和比容量仅为69.2%和127 mA·h/g。结果说明铌掺杂能够有效提高LiNiO2的电化学性能。
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| 关 键 词： | 锂离子电池 正极材料 LiNiO2 掺杂 |
| 收稿时间： | 2022-05-31 |
Preparation and electrochemical performance of Nb-doped LiNiO2 cathode material for lithium-ion batteries |
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| HUANG Liying,LU Dongchu,NING Yuxue,HU Tingting,CHEN Qing,HUANG Guoxin,SU Jing,WEN Yanxuan. Preparation and electrochemical performance of Nb-doped LiNiO2 cathode material for lithium-ion batteries[J]. Inorganic Chemicals Industry, 2022, 54(11): 52-58. DOI: 10.19964/j.issn.1006-4990.2022-0270 |
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| Authors: | HUANG Liying LU Dongchu NING Yuxue HU Tingting CHEN Qing HUANG Guoxin SU Jing WEN Yanxuan |
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| Affiliation: | School of Chemistry and Chemical Engineering，Guangxi University，Nanning 530004，China |
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| Abstract: | In order to improve the performance of LiNiO2，Nb-doped LiNiO2 was prepared by a solid-state reaction method.The effects of the amount of Nb-doping on the structure and performance of LiNiO2 were investigated by X-ray diffraction analysis（XRD），galvanostatic titration（GITT），electrochemical impedance spectroscopy（EIS） and other methods.Nb-doping could effectively improve the order degree of the layered structure，reduce Li+/Ni2+ mixing，reduce the charge transfer impedance，and increase the diffusion coefficient of Li+ in the active materials.Therefore，LiNi0.99Nb0.01O2 exhibited higher capacity retention（91.4% after 100 cycles at 0.5C） and better rate capability（143 mA·h/g at 5C）.As a comparison，the data of bare LiNiO2 was 69.2% and 127 mA·h/g under the same conditions.These results further demonstrated that Nb-doping with a strong Nb—O bond，high valence stat，and larger ionic radius could effectively improve the performance of LiNiO2. |
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| Keywords: | lithium-ion batteries cathode material LiNiO2 doping |
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