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Phase Transitions in the "Spinel-Layered" Li_1+xNi_0.5Mn_1.5O₄ (x = 0, 0.5, 1) Cathodes upon (De)lithiation Studied with Operando Synchrotron X-ray Powder Diffraction.

ABSTRACT: "Spinel-layered" Li_1+xNi_0.5Mn_1.5O₄ (x = 0, 0.5, 1) materials are considered as a cobalt-free alternative to currently used positive electrode (cathode) materials for Li-ion batteries. In this work, their electrochemical properties and corresponding phase transitions were studied by means of synchrotron X-ray powder diffraction (SXPD) in operando regime. Within the potential limit of 2.2-4.9 V vs. Li/Li⁺ LiNi_0.5Mn_1.5O₄ with cubic spinel type structure demonstrates the capacity of 230 mAh·g^-1 associated with three first-order phase transitions with significant total volume change of 8.1%. The Li₂Ni_0.5Mn_1.5O₄ material exhibits similar capacity value and subsequence of the phase transitions of the spinel phase, although the fraction of the spinel-type phase in this material does not exceed 30 wt.%. The main component of Li₂Ni_0.5Mn_1.5O₄ is Li-rich layered oxide Li(Li_0.28Mn_0.64Ni_0.08)O₂, which provides nearly half of the capacity with very small unit cell volume change of 0.7%. Lower mechanical stress associated with Li (de)intercalation provides better cycling stability of the spinel-layered complex materials and makes them more perspective for practical applications compared to the single-phase LiNi_0.5Mn_1.5O₄ high-voltage cathode material.

SUBMITTER: Drozhzhin OA

PROVIDER: S-EPMC8224351 | biostudies-literature |

REPOSITORIES: biostudies-literature

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