4 years ago

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

K-Ion Batteries Based on a P2-Type K0.6CoO2 Cathode
Shou-Hang Bo, Tan Shi, Gerbrand Ceder, Deok-Hwang Kwon, Haegyeom Kim, Jae Chul Kim
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. A layered P2-type K0.6CoO2 cathode can accommodate highly reversible K-ion intercalation. The K-ion intercalation in P2-type K0.6CoO2 occurs at high rate, despite the multitude of phase transitions that are observed with in situ X-ray diffraction. The practical feasibility of K-ion batteries is further demonstrated by constructing full cells with a graphite anode.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700098

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