The high energy density of Li−O batteries surpasses all existing batteries, and it holds the potential to emerge as the most outstanding solution for energy storage in the future. However, the insulated, insoluble discharge product (LiO) has impeded the practical applications. Conventional catalyst design based on electronic structure and interfacial charge transfer descriptors are incapable of overcoming these limitations of LiO. Herein, a magnetic/force coupling assisted Li−O battery based on magnetostrictive and piezoelectric catalysis with CoFeO/BiFeO core-shell structure cathode was established for the first time. An external magnetic field is introduced to produce a magnetostrictive stress on CoFeO, contributing to the piezoelectric electron hole transport by the generated piezoelectric potential energy with a built-in electric field based on the piezoelectric catalytic mechanism, and thus promoting the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics, and reducing the overpotential during charge/discharge. The magnetic/force coupling assisted Li−O battery equipped with the unique CoFeO/BiFeO cathode deliver an ultra-low charging platform of 3.49 V and an ultra-high discharge platform of 2.83 V. This unique magnetic/force assisted strategy provides an important insight into solving the high overpotential in metal-air battery systems.

中文翻译：

---

基于CoFe2O4/BiFeO3阴极磁致伸缩和压电催化的磁/力耦合辅助锂氧电池

Li−O电池的高能量密度超越了所有现有电池，有潜力成为未来最出色的储能解决方案。然而，绝缘的、不溶的放电产物（Li2O）阻碍了实际应用。基于电子结构和界面电荷转移描述符的传统催化剂设计无法克服Li2O的这些局限性。在此，首次建立了基于磁致伸缩和压电催化、具有CoFeO/BiFeO核壳结构阴极的磁/力耦合辅助Li−O电池。引入外部磁场使CoFeO产生磁致伸缩应力，基于压电催化机理，利用内置电场产生的压电势能促进压电电子空穴传输，从而促进氧还原反应（ORR） ）和析氧反应（OER）动力学，并降低充电/放电过程中的过电势。磁/力耦合辅助锂氧电池配备了独特的CoFeO/BiFeO阴极，可提供3.49 V的超低充电平台和2.83 V的超高放电平台。这种独特的磁/力辅助策略提供了重要的见解解决金属-空气电池系统中的高过电势。