Author(s) Cho, M.Kyoung; Jo, J.Hyeon; Choi, J.; Myung, S.T.
Journal ACS Appl Mater Interfaces
Date Published 2019 Jul 16

Potassium-ion batteries have emerged as an alternative to lithium-ion batteries as energy storage systems. In particular, KxMnO2 has attracted considerable attention as a cathode material because of its high theoretical capacity and low cost. In this study, partial substitution of Mn in P3-type K0.5MnO2 with divalent Ni is performed, resulting in a first discharge capacity of approximately 121 mAh (g-oxide)-1 with 82% retention for 100 cycles. Operando synchrotron X-ray diffraction analysis reveals the occurrence phase transition from P3 to O3 on charge and O3-P3-P'3 transition on discharge at the first cycle, where P'3 is a new distorted form of the P3 phase, accompanied by reversible Mn4+/3+ and Ni3+/2+ redox pairs, as evidenced by X-ray absorption spectroscopy. The reduced variation in the lattice parameters during de/potassiation for P3-K0.5[Ni0.1Mn0.9]O2 relative to P3-K0.5MnO2 is suggested as a possible reason for the enhanced electrochemical performance of K0.5[Ni0.1Mn0.9]O2. These results open the possibility of using inexpensive and high-capacity Mn-based cathode active materials for potassium-ion batteries.

DOI 10.1021/acsami.9b06915
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2019.

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