作者:Zhou, CJ (Zhou, Chaojin)[1 ]; Yang, LC (Yang, Lichun)[1 ]; Zhou, CG (Zhou, Chaogang)[2 ]; Lu, B (Lu, Bin)[1 ]; Liu, JW (Liu, Jiangwen)[1 ]; Ouyang, LZ (Ouyang, Liuzhang)[1 ]; Hu, RZ (Hu, Renzong)[1 ]; Liu, J (Liu, Jun)[1 ]; Zhu, M (Zhu, Min)[1 ]
查看 ResearcherID 和 ORCID卷:
期:
页:
DOI:
出版年:
文献类型:Article
O3-type NaNiO2-based cathode materials suffer irreversible phase transition when they are charged to above 4.0 V in sodium-ion batteries. To solve this problem, we partially substitute Ni2+ in O3-type NaNi0.45Mn0.25Ti0.3O2 by Co3+. NaNi0.45Mn0.25Ti0.3O2 with co-substitution possesses an expanded interlayer and exhibits higher rate capability, as well as cyclic stability, compared with the pristine cathode in 2.0-4.4 V. The optimal NaNi0.4Mn0.25Ti0.3Co0.05O2 delivers discharge capacities of 180 and 80 mA h g(-1) at 10 and 1000 mA g(-1). At 100 mA NaNi0.4Mn0.25Ti0.3Co0.05O2 exhibits 152 mA h g(-1) in the initial cycle and maintains 91.4 mA h g(-1) after 180 cycles. Through ex situ X-ray diffraction, co-substitution is demonstrated to be effective in enhancing the reversibility of P3-P3 '' phase transition from 4.0 to 4.4 V. Electrochemical impedance spectroscopy indicates that higher electronic conductivity is achieved by co-substitution. Moreover, cyclic voltammetry and the galvanostatic intermittent titration technique demonstrate faster kinetics for Na+ diffusion due to the co-substitution. This study provides a reference for further improvement of electrochemical performance of cathode materials for high-voltage sodium-ion batteries.
作者关键词:Co-substitution; sodium-ion battery; O-3-type cathode material; high voltage cathode; sol-gel method
KeyWords Plus:TRANSITION-METAL OXIDE; NANI0.5MN0.5O2 CATHODE; ELECTRODE MATERIALS; BATTERIES; INTERCALATION; CRYSTAL; NANIO2; WATER; P2
通讯作者地址:Yang, LC (通讯作者)
 | South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China. |
地址:
电子邮件地址:mslcyang@scut.edu.cn
| 基金资助机构 | 授权号 |
|---|---|
| National Natural Science Foundation of China | 51671089 |
| Foundation for Innovative Research Groups of the National Natural Science Foundation of China | NSFC51621001 |
| Guangdong Natural Science Funds for Distinguished Young Scholar | 2017B030306004 |
| Guangdong Special Support Program | 2017TQ04N224 |
| Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme | |
| Fundamental Research Funds for the Central Universities |