Thermodynamic analysis of Li-Ni-Co-Mn-H2O system and synthesis of LiNi0.5Co0.2Mn0.3O2 composite oxide via aqueous process
| Autor: | Qiang Han, Tongxing Lei, Qianye Su, Yunjiao Li, Shiyi Deng, Lin Li, Yongxiang Chen, Wei-sheng Lu, Ling Li |
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| Rok vydání: | 2019 |
| Předmět: |
Range (particle radiation)
Aqueous solution Materials science Metals and Alloys General Engineering Oxide 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity chemistry Chemical engineering law Scientific method Hydroxide 0210 nano-technology |
| Zdroj: | Journal of Central South University. 26:2668-2680 |
| ISSN: | 2227-5223 2095-2899 |
| Popis: | The constructed potential-pH diagrams of Li-Ni (Co, Mn)-H2O system indicate that the LiNiO2, LiCoO2 and LiMnO2 are thermodynamically stable in aqueous solution within the temperature range of 25-200 °C and the activity range of 0.01-1.00. A predominant co-region of LiNiO2, LiCoO2 and LiMnO2 oxides (Li-Ni-Co-Mncomposite oxide) is found in the Li-Ni-Co-Mn-H2O potential-pH diagrams, in which the co-precipitation region expands towards lower pH with rising temperature, indicating the enhanced possibility of synthesizing Li-Ni-Co-Mn composite oxide in aqueous solution. The experimental results prove that it is feasible to prepare the LiNi0.5Co0.2Mn0.3O2 cathode materials (NCM523) by an aqueous routine. The as-prepared lithiated precursor and NCM523 both inherit the spherical morphology of the hydroxide precursor and the obtained NCM523 has a hexagonal α-NaFeO2 structure with good crystallinity. It is reasonable to conclude that the aqueous routine for preparing Ncm cathode materials is a promising method with the guidance of the reliable potential-pH diagrams to some extent. |
| Databáze: | OpenAIRE |
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