Rapid synthesis of layered KxMnO2 cathodes from metal–organic frameworks for potassium-ion batteries,Chemical Science

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Rapid synthesis of layered KxMnO2 cathodes from metal–organic frameworks for potassium-ion batteries
Chemical Science ( IF 7.6 ) Pub Date : 2022-06-06 , DOI: 10.1039/d2sc02442j
Ang Li ₁ , Changfeng Li ₁ , Peixun Xiong ₁ , Jinfeng Zhang ₁ , Dongling Geng ₂ , Yunhua Xu ₁

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Layered transition metal oxides (LTMOs) are a kind of promising cathode materials for potassium-ion batteries because of their abundant raw materials and high theoretical capacities. However, their synthesis always involves long time calcination at a high temperature, leading to low synthesis efficiency and high energy consumption. Herein, an ultra-fast synthesis strategy of Mn-based LTMOs in minutes is developed directly from alkali-transition metal based-metal–organic frameworks (MOFs). The phase transformation from the MOF to LTMO is systematically investigated by thermogravimetric analysis, variable temperature optical microscopy and X-ray diffraction, and the results reveal that the uniform distribution of K and Mn ions in MOFs promotes fast phase transformation. As a cathode in potassium-ion batteries, the fast-synthesized Mn-based LTMO demonstrates an excellent electrochemical performance with 119 mA h g⁻¹ and good cycling stability, highlighting the high production efficiency of LTMOs for future large-scale manufacturing and application of potassium-ion batteries.

中文翻译：

用于钾离子电池的金属有机框架快速合成层状 KxMnO2 正极

层状过渡金属氧化物（LTMOs）具有丰富的原材料和较高的理论容量，是一种很有前途的钾离子电池正极材料。然而，它们的合成往往需要在高温下长时间煅烧，导致合成效率低、能耗高。在此，基于碱金属过渡金属的金属有机框架（MOF）直接开发了一种在几分钟内超快速合成锰基 LTMO 的策略。通过热重分析、变温光学显微镜和 X 射线衍射系统地研究了 MOF 到 LTMO 的相变，结果表明，MOF 中 K 和 Mn 离子的均匀分布促进了快速相变。作为钾离子电池的阴极，^-1和良好的循环稳定性，突出了LTMOs的高生产效率，用于未来钾离子电池的大规模制造和应用。

更新日期：2022-06-06

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