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Una batería recargable de calcio y oxígeno que funciona a temperatura ambiente
Lei Ye1, Meng Liao1, Kun Zhang1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, China.
Nature
|February 7, 2024
Resumen
Los investigadores desarrollaron una batería recargable de calcio y oxígeno (Ca-O2) que funciona a temperatura ambiente. Este avance utiliza un nuevo electrolito y cátodo, permitiendo 700 ciclos con un producto reactivo de descarga de peróxido de calcio.
Área de la Ciencia:
- La electroquímica
- Ciencias de los materiales
Sus antecedentes:
- Las baterías de calcio-oxígeno (Ca-O2) ofrecen una alta capacidad teórica a través de la reducción de O2 a compuestos de óxido de calcio (CaOx).
- Los desafíos incluyen productos de descarga inertes y incompatibilidad de electrolitos con ánodos metálicos de Ca y O2, lo que dificulta la recarga a temperatura ambiente.
Objetivo del estudio:
- Desarrollar una batería recargable de CaO2 que funcione eficientemente a temperatura ambiente.
- Para superar las limitaciones de los productos de descarga inertes y la estabilidad de los electrolitos en los sistemas de CaO2.
Principales métodos:
- Diseñó una batería Ca-O2 utilizando un nuevo electrolito iónico a base de líquido.
- Habilitó una reacción redox de dos electrones formando peróxido de calcio químicamente reactivo (CaO2) como producto de descarga.
- Facilitado el desmontaje de la placa de Ca en el ánodo y mejorado el redox de CaO2/O2 en el cátodo.
Principales resultados:
- Logró una batería recargable Ca-O2 con 700 ciclos a temperatura ambiente.
- Se ha demostrado la formación de productos reactivos de descarga de CaO2.
- Demostró la estabilidad de la batería en el aire y el potencial para aplicaciones textiles flexibles.
Conclusiones:
- Un nuevo sistema de batería Ca-O2 supera las limitaciones anteriores para el funcionamiento a temperatura ambiente.
- El uso de CaO reactivo y un electrolito estable permite una larga vida útil.
- La tecnología es adecuada para baterías textiles flexibles estables al aire para sistemas portátiles.
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