Journal
ENERGY STORAGE MATERIALS
Volume 31, Issue -, Pages 20-26Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.06.002
Keywords
Potassium-ion batteries; Layered oxides; Cathode materials; Structure control; P2-OP4 phase transition
Funding
- Beijing National Laboratory for Molecular Sciences [BNLMS- CXXM-202010]
- Beijing Natural Science Foundation [L182050]
- National Natural Science Foundation of China [51672282, 11874254, 51802187]
- Shanghai Sailing Program [18YF1408700]
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The development of PIBs is challenged by the availability of suitable cathode materials capable of stably hosting the large-sized K+, whose continuous intercalation/deintercalation in the crystalline framework will cause serious phase deformation and irreversible structure degradation. Here, we demonstrated the possibility of achieving a highly reversible potassiation/depotassiation process in a layered metal oxide of K5/9Mn7/9Ti2/9O2. We confirmed that the existence of Ti can effectively combat the transition metal slab gliding of the P2-type structure during the electrochemical reaction. The destructive P2-O2 phase transition was efficiently diminished even when charged to a high voltage of 4.2 V, instead forming a stable OP4 phase which was able to switch back to its pristine P2-type structure upon discharge, accordingly providing an improved electrochemical performance of PIBs. We expect that the discovery and fundamental understanding of such a reversible P2-OP4 phase transition provide insights in the structural design of PIBs cathodes.
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