锂离子电池正极材料铌掺杂LiNiO2 的制备与电化学性能
收稿日期: 2022-05-31
网络出版日期: 2022-11-23
基金资助
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)
Preparation and electrochemical performance of Nb-doped LiNiO2 cathode material for lithium-ion batteries
Received date: 2022-05-31
Online published: 2022-11-23
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。
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
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.
Key words： lithium-ion batteries; cathode material; LiNiO2; doping
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