| Al2O3包覆LiNi0.03Co0.05Mn1.92O4正极材料的制备及其电化学性能 |
| |
| 引用本文： | 王诗敏,刘红雷,郭俊明,向明武,苏长伟,白红丽,刘晓芳,白玮. Al2O3包覆LiNi0.03Co0.05Mn1.92O4正极材料的制备及其电化学性能[J]. 稀有金属材料与工程, 2020, 49(9): 3129-3135 |
| |
| 作者姓名： | 王诗敏 刘红雷 郭俊明 向明武 苏长伟 白红丽 刘晓芳 白玮 |
| |
| 作者单位： | 云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学;生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学;生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心,云南民族大学,生物基材料绿色制备技术国家地方联合工程研究中心 |
| |
| 基金项目： | 国家自然科学基金资助(项目号U1602273,51972282) |
| |
| 摘 要： | 以Al(NO3)3?9H2O为包覆原料，通过燃烧法制备得到LiNi0.03Co0.05Mn1.92O4@Al2O3正极材料。通过X射线衍射(XRD)，场发射扫描电子显微镜(FESEM)和透射电镜(TEM)等表征手段对材料的结构和形貌进行分析，并通过恒电流充放电、循环伏安(CV)、交流阻抗(EIS)等测试分析材料的电化学性能。结果表明，Al2O3包覆没有改变LiNi0.03Co0.05Mn1.92O4的尖晶石型结构，包覆层厚度约10.6nm。LiNi0.03Co0.05Mn1.92O4@Al2O3正极材料电化学性能得到了明显改善，1 C和10 C倍率下初始放电比容量分别为119.9 mAh?g-1和106.3 mAh?g-1，充放电循环500次后容量保持率分别为88.4%和78.2%，而未包覆的LiNi0.03Co0.05Mn1.92O4在1 C和10 C倍率下初始放电比容量分别为121.2 mAh?g-1和104.0 mAh?g-1，500次循环后容量保持率分别为84.1%和67.6%。LiNi0.03Co0.05Mn1.92O4@Al2O3活化能为32.92 kJ?mol-1，而未包覆材料的活化能为36.24 kJ?mol-1，包覆有效降低了材料Li+扩散所需克服的能垒，提高了材料的电化学性能。
|
| 关 键 词： | LiMn[sub_s]2[sub_e]O[sub_s]4[sub_e] 正极材料 Al[sub_s]2[sub_e]O[sub_s]3[sub_e] 包覆 锂离子电池 |
| 收稿时间： | 2019-08-14 |
| 修稿时间： | 2019-09-23 |
Synthesis and Electrochemical Performance of Al2O3 Coated LiNi0.03Co0.05Mn1.92O4 as Cathode Material |
| |
| Wang Shimin,Liu Honglei,Guo Junming,Xiang Mingwu,Su Changwei,Bai Hongli,Liu Xiaofang and Bai Wei. Synthesis and Electrochemical Performance of Al2O3 Coated LiNi0.03Co0.05Mn1.92O4 as Cathode Material[J]. Rare Metal Materials and Engineering, 2020, 49(9): 3129-3135 |
| |
| Authors: | Wang Shimin Liu Honglei Guo Junming Xiang Mingwu Su Changwei Bai Hongli Liu Xiaofang Bai Wei |
| |
| Affiliation: | Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials;China;Yunnan Minzu University,Key Laboratory of Green-chemical Materials in University of Yunnan Province;China,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials;China;Yunnan Minzu University,Key Laboratory of Green-chemical Materials in University of Yunnan Province;China,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials |
| |
| Abstract: | Al2O3-coated LiNi0.03Co0.05Mn1.92O4 cathode materials were prepared by combustion method with aluminum nitrate nonahydrate as raw material. The structure and morphology of the materials were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM), and the electrochemical performance were characterized by galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was found that Al2O3 coating did not change the spinel structure of LiNi0.03Co0.05Mn1.92O4, and the coating thickness was about 10.6 nm. The LiNi0.03Co0.05Mn1.92O4@Al2O3 material exhibited excellent electrochemical performance. The initial discharge capacity of the Al2O3 coated materials were 119.9mAh g-1 at 1C rate and 106.3 mAh?g-1 at 10 C rate, the capacity retention were 88.4 % and 78.2% after charge/discharge cycles for 500 times. While the initial discharge capacity of uncoated LiNi0.03Co0.05Mn1.92O4 were 121.2 mAh?g-1 and 104 mAh?g-1 at different rates, the retention rate were 84.1% and 67.6% after 500 cycles, respectively. Besides that, the LiNi0.03Co0.05Mn1.92O4@Al2O3 had a lower activation energy of 32.92 kJ?mol-1, while 36.24 kJ?mol-1 for the uncoated. The energy barrier needed for lithium ion diffusion was effectively reduced and the electrochemical performance of the cathode material was improved by coating. |
| |
| Keywords: | LiMn2O4 cathode materials Al2O3 coating lithium-ion batteries |
|
| 点击此处可从《稀有金属材料与工程》浏览原始摘要信息 |
|
点击此处可从《稀有金属材料与工程》下载全文 |
|
