Abstract Potassium-ion batteries (KIBs) have been recognized as one promising type of new energy storage technology. Exploring and developing novel and effective cathode materials has become the hotspot research area. Herein, a layered K0.48Ni0.2Co0.2Mn0.6O2 (KNCMO) with a mixed morphology of microspheres and microcubes was prepared. When evaluated for use in KIBs, the KNCMO exhibited outstanding electrochemical properties. In practical terms, KNCMO can deliver a reversible capacity of ~57 mAh g−1 at 40 mA g−1, and shows good rate performance. When the specific current was increased to 400 mA g−1, a considerable reversible capacity of ~35 mAh g−1 after 350 cycles can be obtained. This work can serve as a broader insight into the future development of cathode materials for potassium-ion batteries.

中文翻译：

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具有微球和微立方混合形态的层状 P3 型 K0.48Ni0.2Co0.2Mn0.6O2 作为钾离子电池的正极材料

摘要 钾离子电池（KIBs）被认为是一种很有前景的新型储能技术。探索和开发新型有效的正极材料已成为研究的热点。在此，制备了具有微球和微立方体混合形态的层状 K0.48Ni0.2Co0.2Mn0.6O2 (KNCMO)。当评估用于 KIB 时，KNCMO 表现出出色的电化学性能。实际上，KNCMO 可以在 40 mA g-1 下提供~57 mAh g-1 的可逆容量，并显示出良好的倍率性能。当比电流增加到 400 mA g-1 时，350 次循环后可以获得~35 mAh g-1 的相当大的可逆容量。这项工作可以为钾离子电池正极材料的未来发展提供更广泛的见解。