High-performance Ti-doped O3-type Na[Tix(Ni0.6Co0.2Mn0.2)1-x]O2 cathodes for practical sodium-ion batteries
| Autor: | Jang Yeon Hwang, Hun-Gi Jung, Yang-Kook Sun, In Tae Bae, Tae Yeon Yu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Scanning electron microscope Doping Energy Engineering and Power Technology Sodium-ion battery 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Anode Chemical engineering Transition metal law Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 422:1-8 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2019.03.031 |
| Popis: | Ti-doped O3-type Na[Tix(Ni0.6Co0.2Mn0.2)1-x]O2 is studied as a high-performance cathode material for practical sodium-ion batteries. The effect of partial Ti doping on the structural and electrochemical properties of O3-type Na[Ni0.6Co0.2Mn0.2]O2 materials is investigated by varying the Ti content (x) in Na[Ni0.6Co0.2Mn0.2]O2 from 0 to 0.01 to 0.03. Scanning electron microscopy images show that upon doping, the primary particles aggregate and form densely packed secondary particles, yielding enhanced mechanical strength and high tap density of ∼2.3 g cm−3. The compact morphology of the particles effectively minimizes the void volume for possible electrolyte penetration that usually leads to unwanted side reactions. In addition, partial doping of Ti in the transition-metal layer greatly improve the structural stability. By taking both morphological and structural advantages, the O3-type Na[Ti0.03(Ni0.6Co0.2Mn0.2)0.97]O2 cathode demonstrate the great enhancements of battery performances in terms of capacity, cycle retention, rate capability, and thermal properties. Pouch-type full cells assembled by combining the present cathodes with hard carbon anodes show good practical applicability, with an outstanding cycle retention of 77% over 400 cycles. The results of this study may open up a new avenue for designing and developing suitable transition metal oxide cathodes for high-performance sodium-ion batteries. |
| Databáze: | OpenAIRE |
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