K-Ion Batteries Based on a P2-Type K0.6CoO2 Cathode
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley CA 94720 USA
- Department of Materials Science and Engineering, University of California, Berkeley CA 94720 USA
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 K 0.6 CoO 2 cathode is developed and highly reversible K ion intercalation is demonstrated. In situ X‐ray diffraction combined with electrochemical titration reveals that P2‐type K 0.6 CoO 2 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; DE‐AC02‐05CH11231
- OSTI ID:
- 1361219
- Alternate ID(s):
- OSTI ID: 1361220; OSTI ID: 1437001
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- Germany
- Language:
- English
Web of Science
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