Effects of Mg, Al Co-doping into Mn site on electrochemical performance of LiNi0.5Co0.2Mn0.3O2
- Authors: Chen Y.1,2, Zhang Z.1,2
-
Affiliations:
- Key Laboratory of Fuel Cell Technology of Guangdong Province
- School of Chemistry and Chemical Engineering
- Issue: Vol 53, No 4 (2017)
- Pages: 333-338
- Section: Article
- URL: https://journals.rcsi.science/1023-1935/article/view/188600
- DOI: https://doi.org/10.1134/S1023193517040048
- ID: 188600
Cite item
Abstract
In order to study the influence of multiple ions doping into single-site on the structure and electrochemical properties of Ni-rich layered-structure cathode material LiNi0.5Co0.2Mn0.3O2, the coprecipitation of hydroxides was applied to synthesize Mg, Al co-doped cathode material LiNi0.5Co0.2Mn0.3–xMg1/2xAl1/2xO2 (x = 0.00, 0.01, 0.02, 0.04) in this paper. Morphology and structure, kinetic parameter, impedance and electrochemical performance of the material were respectively characterized by SEM, XRD, CV, EIS and galvanostatic charge/discharge test. The results of comprehensive analysis showed that the properties of material were improved obviously when the amount of doping was 0.02. At this amount of doping, the corresponding material has smaller cation mixing, higher hexagonal ordering of layered-structure, larger Li+ ion diffusion coefficients which are 2.444 × 10–10 and 4.186 × 10–10 cm2 s–1 for Li+ intercalation and deintercalation respectively, smaller impedance which is 33.93 Ω, higher specific capacity of first-discharge which is 168.01 mA h g–1 and higher capacity retention rate which is up to 95.06% after 20 cycles at 0.5 C (100 mA g–1).
About the authors
Yuming Chen
Key Laboratory of Fuel Cell Technology of Guangdong Province; School of Chemistry and Chemical Engineering
Email: chzzhang@scut.edu.cn
China, Guangzhou, 510640; Guangzhou, 510640
Zhen Zhang
Key Laboratory of Fuel Cell Technology of Guangdong Province; School of Chemistry and Chemical Engineering
Author for correspondence.
Email: chzzhang@scut.edu.cn
China, Guangzhou, 510640; Guangzhou, 510640