Effect of Nb5+ doping on LiNi0.5Co0.25Mn0.25O2 cathode material
| Autor: | Chenyu Du, Lina Li, Enshan Han, Lingzhi Zhu, Shunpan Qiao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope General Chemical Engineering Doping General Engineering Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Dielectric spectroscopy chemistry General Materials Science Lithium Cyclic voltammetry 0210 nano-technology Spectroscopy |
| Zdroj: | Ionics. 26:2655-2664 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-019-03403-9 |
| Popis: | Li (Ni0.5Co0.25Mn0.25)1−xNbxO2 (x = 0, 0.005, 0.01, 0.02, 0.03) cathode material was synthesized by co-precipitation. X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) were used to analyze the crystal structure characteristics and morphology of the powder. The charge and discharge test, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) were used to study the electrochemical properties of the battery in detail. XRD results show that Nb5+ substitution does not destroy the crystal structure, but it can enlarge the interplanar spacing, which is beneficial to the diffusion of lithium ions. The electrochemical properties of the material Li (Ni0.5Co0.25Mn0.25)0.99Nb0.01O2 are the best. The discharge specific capacity is 204.6, 186.0, 163.5, 141.6 mAh/g at 0.1C, 0.2C, 0.5C, and 1.0C, respectively. And the discharge specific capacity is as high as 174.1 mAh/g when returning to 0.1C again. After circulating 45 cycles at 0.1C, the capacity retention rate was 89.08%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink