Synergistic Adsorption-Catalytic Sites TiN/Ta<sub>2</sub>O<sub>5</sub> with Multidimensional Carbon Structure to Enable High-Performance Li-S Batteries
Lithium-sulfur (Li-S) batteries are deemed to be one of the most optimal solutions for the next generation of high-energy-density and low-cost energy storage systems. However, the low volumetric energy density and short cycle life are a bottleneck for their commercial application. To achieve high en...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/8782b79500ce467391c4aac7513499bd |
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| Sumario: | Lithium-sulfur (Li-S) batteries are deemed to be one of the most optimal solutions for the next generation of high-energy-density and low-cost energy storage systems. However, the low volumetric energy density and short cycle life are a bottleneck for their commercial application. To achieve high energy density for lithium-sulfur batteries, the concept of synergistic adsorptive–catalytic sites is proposed. Base on this concept, the TiN@C/S/Ta<sub>2</sub>O<sub>5</sub> sulfur electrode with about 90 wt% sulfur content is prepared. TiN contributes its high intrinsic electron conductivity to improve the redox reaction of polysulfides, while Ta<sub>2</sub>O<sub>5</sub> provides strong adsorption capability toward lithium polysulfides (LiPSs). Moreover, the multidimensional carbon structure facilitates the infiltration of electrolytes and the motion of ions and electrons throughout the framework. As a result, the coin Li-S cells with TiN@C/S/Ta<sub>2</sub>O<sub>5</sub> cathode exhibit superior cycle stability with a decent capacity retention of 56.1% over 300 cycles and low capacity fading rate of 0.192% per cycle at 0.5 C. Furthermore, the pouch cells at sulfur loading of 5.3 mg cm<sup>−2</sup> deliver a high areal capacity of 5.8 mAh cm<sup>−2</sup> at low electrolyte/sulfur ratio (E/S, 3.3 μL mg<sup>−1</sup>), implying a high sulfur utilization even under high sulfur loading and lean electrolyte operation. |
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