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K-Ion Batteries Based on a P2-Type K0.6CoO2 Cathode

机译：基于P2型K0.6CoO2阴极的K离子电池

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K-ion batteries are a potentially exciting and new energy storage technology that can combine high specific energy, cycle life, and good power capability, all while using abundant potassium resources. The discovery of novel cathodes is a critical step toward realizing K-ion batteries (KIBs). In this work, a layered P2-type K0.6CoO2 cathode is developed and highly reversible K ion intercalation is demonstrated. In situ X-ray diffraction combined with electrochemical titration reveals that P2-type K0.6CoO2 can store and release a considerable amount of K ions via a topotactic reaction. Despite the large amount of phase transitions as function of K content, the cathode operates highly reversibly and with good rate capability. The practical feasibility of KIBs is further demonstrated by constructing full cells with a graphite anode. This work highlights the potential of KIBs as viable alternatives for Li-ion and Na-ion batteries and provides new insights and directions for the development of next-generation energy storage systems.
机译：钾离子电池是一种潜在的令人兴奋的新能源存储技术，可以结合高比能量，循环寿命和良好的发电能力，同时使用大量的钾资源。新型阴极的发现是实现K离子电池（KIB）的关键一步。在这项工作中，开发了一个分层的P2型K0.6CoO2阴极，并证明了高度可逆的K离子嵌入。原位X射线衍射结合电化学滴定表明，P2型K0.6CoO2可以通过全位反应反应存储和释放大量K离子。尽管有大量的相变作为K含量的函数，但阴极仍可高度可逆地运行并具有良好的定速能力。通过用石墨阳极构造全电池，KIB的实际可行性得到了进一步证明。这项工作突出了KIB作为锂离子和Na离子电池可行替代品的潜力，并为开发下一代储能系统提供了新的见识和方向。

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