Optimizing transition metal ion ratio of LiNi0.5+xCo0.2+yMn0.3+zO2 (x+y+z=0) by simplex and normalization combined method | |
Cui, Xiaoling1,2; Wang, Shengxian1; Mao, Liping1; Wang, Peng1; Li, Zhaojuan1; Wang, Shimin1; Li, Shiyou1,2 | |
2020-03-20 | |
发表期刊 | ELECTROCHIMICA ACTA |
ISSN | 0013-4686 |
卷号 | 337 |
摘要 | Optimizing the ratio of transition metal (TM) ions is an effective modification strategy to improve the electrochemical properties of LiNi0.5+xCo0.2+yMn0.3+zO2 (x + y + z = 0, and the absolute values of x, y and z are not more than 0.03). In this work, we develope a new method which combines the simplex method with the normalization method of evaluation index (SNEI) to optimize the TM ion ratio of LiNi0.5+xCo0.2+yMn0.3+zO2. This method can significantly improve the optimization efficiency. Only after three times of simplex operation, the optimum component of LiNi0.493Co0.214Mn0.293O2 is obtained. The results show that the electrochemical properties of material have improved significantly through adjustment of the ratio of TM ions slightly, and LiNi0.493Co0.214Mn0.293O2-based cells exhibit long cycle life and good rate capability due to the low degree of Li/Ni mixing and the slow increase of impedance during cycling. Simultaneously, the impact of the intensity of the TM ion ratio on electrochemical performances are studied, and the following trend is observed in decreasing the sensitivity of the evaluation indexes: cycle performance > rate capacity > specific capacity. This newly-developed SNEI method has a wide applicability and great prospects in electrolyte and electrode formulations. (C) 2020 Elsevier Ltd. All rights reserved. |
关键词 | LiNi0.5Co0.2Mn0.3O2 Cathode Simplex method Transition metal ions Evaluation index normalization |
DOI | 10.1016/j.electacta.2020.135709 |
收录类别 | SCI ; SCIE ; EI |
语种 | 英语 |
资助项目 | Natural Science Foundation of China[21566021] ; High Value Patent Conversion Implementation Project[18ZC1LA014] ; Qinghai Science and Technology Plan[2019-ZJ-7038] |
WOS研究方向 | Electrochemistry |
WOS类目 | Electrochemistry |
WOS记录号 | WOS:000521531700056 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
EI入藏号 | 20200508094178 |
EI主题词 | Lithium compounds |
EI分类号 | 531 Metallurgy and Metallography - 531.1 Metallurgy - 702 Electric Batteries and Fuel Cells - 801.4.1 Electrochemistry - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally |
来源库 | WOS |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | https://ir.lut.edu.cn/handle/2XXMBERH/64132 |
专题 | 石油化工学院 |
通讯作者 | Li, Shiyou |
作者单位 | 1.Lanzhou Univ Technol, Coll Petrochem Technol, 36 Pengjiaping Rd, Lanzhou 730050, Gansu, Peoples R China; 2.Qinghai Green Grass New Energy Technol Co Ltd, Qinghai Res Ctr Low Temp Lithium Ion Battery Tech, Xining 810000, Peoples R China |
第一作者单位 | 石油化工学院 |
通讯作者单位 | 石油化工学院 |
第一作者的第一单位 | 石油化工学院 |
推荐引用方式 GB/T 7714 | Cui, Xiaoling,Wang, Shengxian,Mao, Liping,et al. Optimizing transition metal ion ratio of LiNi0.5+xCo0.2+yMn0.3+zO2 (x+y+z=0) by simplex and normalization combined method[J]. ELECTROCHIMICA ACTA,2020,337. |
APA | Cui, Xiaoling.,Wang, Shengxian.,Mao, Liping.,Wang, Peng.,Li, Zhaojuan.,...&Li, Shiyou.(2020).Optimizing transition metal ion ratio of LiNi0.5+xCo0.2+yMn0.3+zO2 (x+y+z=0) by simplex and normalization combined method.ELECTROCHIMICA ACTA,337. |
MLA | Cui, Xiaoling,et al."Optimizing transition metal ion ratio of LiNi0.5+xCo0.2+yMn0.3+zO2 (x+y+z=0) by simplex and normalization combined method".ELECTROCHIMICA ACTA 337(2020). |
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