Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites | |
Kang Wu1,4,5; Jia, Guofeng4,5; Shangguan, Xuehui1,4,5; Yang, Guowei1,4,5; Zhu, Zenghu4,5; Peng, Zhengjun4,5; Qin Zhuge4,5; Li, Faqiang2,4,5; Cui, Xiaoling3 | |
刊名 | JOURNAL OF ALLOYS AND COMPOUNDS |
2018-10-15 | |
卷号 | 765页码:700-709 |
关键词 | LiNi0.8Co0.2O2 cathode material Electrochemical performance Li/Ni mixing Polarization Structure stability |
ISSN号 | 0925-8388 |
DOI | 10.1016/j.jallcom.2018.03.375 |
英文摘要 | High rate performance has been a challenging issue for LiNi0.8Co0.2O2 material. Elemental doping is a very effective method that has been used to maintain the structure of cathode materials with high stability and improve the high rate performance. Encouraged by previous research and considering the shortcomings of LiNi0.8Co0.2O2, materials with a composition of Li1-xNbxNi0.8Co0.2O2 (x = 0, 0.01, 0.03) were prepared by co-precipitation and the solid phase sintering method. The structure and electrochemical performance were studied in detail. The results from structural analysis suggested that the doping element was successfully doped into LiNi0.8Co0.2O2. Electrochemical measurements suggested that high rate capacities led to distinct improvements for a moderate Nb-doping content. Specifically, the initial capacities delivered by LiNi0.8Co0.2O2 and Li0.99Nb0.01Ni0.8Co0.2O2 increased from 97 to 156 mAh/g at 25 degrees C and 62.1 to 144.7 mAh/g at 50 degrees C at a rate of 5 C. In addition, the results from differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis demonstrated that the Nb-doped LiNi0.8Co0.2O2 had a higher thermal stability in the charged state compared to the un-doped material. Therefore, the Li+ sites in LiNi0.8Co0.2O2 were partially substituted by the high valence element Nb, which can lower Li/Ni mixing and polarization, accelerate the migration rate of Li+ and stabilize the structure of the cathode material, thus improving the high rate performance and cycling stability. (C) 2018 Elsevier B.V. All rights reserved. |
资助项目 | Natural Science Foundation of China[U1507106] ; Natural Science Foundation of China[U1507114] |
WOS研究方向 | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE SA |
WOS记录号 | WOS:000444341900086 |
状态 | 已发表 |
内容类型 | 期刊论文 |
源URL | [http://119.78.100.223/handle/2XXMBERH/32397] |
专题 | 石油化工学院 |
通讯作者 | Li, Faqiang |
作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Qinghai Green Grass New Energy Technol Co Ltd, Qinghai Res Ctr Low Temp Lithium Ion Battery Tech, Xining 810000, Qinghai, Peoples R China 3.Lanzhou Univ Technol, Coll Petrochem Technol, Lanzhou 730050, Gansu, Peoples R China 4.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China 5.Key Lab Salt Lake Resources Chem Qinghai Prov, Xining 810008, Qinghai, Peoples R China |
推荐引用方式 GB/T 7714 | Kang Wu,Jia, Guofeng,Shangguan, Xuehui,et al. Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,765:700-709. |
APA | Kang Wu.,Jia, Guofeng.,Shangguan, Xuehui.,Yang, Guowei.,Zhu, Zenghu.,...&Cui, Xiaoling.(2018).Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites.JOURNAL OF ALLOYS AND COMPOUNDS,765,700-709. |
MLA | Kang Wu,et al."Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites".JOURNAL OF ALLOYS AND COMPOUNDS 765(2018):700-709. |
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