| Autor: |
Li, Shuang, Zhang, Zeyu, Yuan, Fei, Wang, Zhen, Wang, Bo |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 6/21/2024, Vol. 26 Issue 23, p16838-16846, 9p |
| Abstrakt: |
As a key configuration, hard carbon (HC) is widely regarded as a promising cathode for rechargeable aluminum batteries (RABs), because of its enlarged interlayer spacing and well-developed pore structures. However, the trade-off between the pore structure, interlayer spacing and conductivity easily leads to an unsatisfactory electrochemical performance in terms of capacity and cycling stability. Hence, N-doped hard carbon (P-M) is synthesized at a relatively low temperature (700 °C) and anion intercalation associated with the energy storage process is investigated. The results demonstrate that the introduction of a N-doping agent not only expands the layer spacing and creates rich pore structures, but also boosts the conductivity. Compared with HC without N-doping, the expanded interlayer spacing in P-M can increase ion storage ability, and the rich pore channels contribute to electron transfer. Besides, compared with HC annealed at a higher temperature (900 °C), the enhanced conductivity in P-M is conducive to accelerating ion diffusion. Benefiting from these structure merits, the optimized P-M cathode delivers a high capacity (323 mA h g−1 at 500 mA g−1) and a prolonged cycle lifespan over 1000 cycles at 1 A g−1 retaining 109 mA h g−1. This work can provide a guidance for developing other high-performance hard carbon cathodes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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