In the past few years, electrochemical energy storage (EES) systems including rechargeable metal-ion batteries and supercapacitors have received increasing attention because of their wide applications in public wearable and portable consumer electronics, electronic skin, and hybrid electric vehicles. Especially, hybrid supercapacitors (HSCs) or asymmetric supercapacitors (ASCs) assembled with battery-type and capacitive-type electrodes usually exhibit superior electrochemical performance by combining the advantages of high capacity from battery-type cathodes and broad voltage windows from electric double-layer capacitive anodes. However, the sluggish ion/electron diffusion and inferior structural stability of the battery-grade electrode materials may limit their actual applications in some fields requiring high-rate and long-life energy storage and conversion. Much effort has been focused on the development of cathode materials with high-performance. As a spinel binary metal cobaltite, MgCo₂O₄ has attracted extensive attention in EES because of its high theoretical capacity, relatively better environmental friendliness and the abundant natural reserves of magnesium. In this work, current research progress regarding the synthetic strategies for powdered MgCo₂O₄, binder-free hetero-structure of MgCo₂O₄ on the current collector, and MgCo₂O₄-based composites and their applications in supercapacitors, Li-ion batteries, Mg-ion batteries, and some other rechargeable ion batteries is reviewed in detail. Finally, we put forward some conclusive remarks and perspectives on the future development of metal-ion batteries and supercapacitors with outstanding performance. Our intention is to provide some clues for the build-up of high-rate and long-life energy storage systems as well as guidance for future related research on other binary metal cobaltites in energy storage devices.

中文翻译：

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用于电化学能量存储和转换的 MgCo2O4 基电极材料：综合综述

近年来，包括可充电金属离子电池和超级电容器在内的电化学储能（EES）系统因其在公共可穿戴和便携式消费电子产品、电子皮肤和混合动力电动汽车中的广泛应用而受到越来越多的关注。特别是，由电池型和电容型电极组装的混合超级电容器 (HSC) 或非对称超级电容器 (ASC) 通常结合电池型阴极的高容量和双电层电容型的宽电压窗口的优点，表现出优异的电化学性能。阳极。然而，电池级电极材料的离子/电子扩散缓慢和结构稳定性较差，可能会限制其在一些需要高倍率和长寿命能量存储和转换领域的实际应用。许多努力都集中在开发具有高性能的正极材料上。作为尖晶石二元金属钴酸盐，MgCo₂ O ₄因其较高的理论容量、较好的环境友好性和丰富的镁天然储量而在EES中受到广泛关注。在这项工作中，目前的研究进展关于用于粉末碳酸镁的合成策略₂ ö ₄，不含粘合剂的碳酸镁的异质结构₂ Ò ₄上的集电体，和碳酸镁₂ ö ₄基于复合材料及其在超级电容器、锂离子电池、镁离子电池和其他一些可充电离子电池中的应用进行了详细综述。最后，我们对性能突出的金属离子电池和超级电容器的未来发展提出了一些总结性的评论和展望。我们的目的是为构建高倍率和长寿命的储能系统提供一些线索，并为未来储能装置中其他二元金属钴酸盐的相关研究提供指导。