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
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume337
AbstractOptimizing 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.
KeywordLiNi0.5Co0.2Mn0.3O2 Cathode Simplex method Transition metal ions Evaluation index normalization
DOI10.1016/j.electacta.2020.135709
Indexed BySCI
Language英语
Funding ProjectNatural Science Foundation of China[21566021] ; High Value Patent Conversion Implementation Project[18ZC1LA014] ; Qinghai Science and Technology Plan[2019-ZJ-7038]
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000521531700056
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Document Type期刊论文
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64132
Collection石油化工学院
Corresponding AuthorLi, Shiyou
Affiliation1.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
First Author AffilicationColl Petrochem Engn
Corresponding Author AffilicationColl Petrochem Engn
First Signature AffilicationColl Petrochem Engn
Recommended Citation
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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