Voltage decay and redox asymmetry mitigation by reversible cation migration in lithium-rich layered oxide electrodes

Abstract

Voltage decay and redox asymmetry mitigation by reversible cation migration in lithiumrich layered oxide electrodes.

Dislocation and oxygen-release driven delithiation in Li2MnO3

“…because of their higher Li contents. This leads to the significantly higher theoretical capacities (up to 460 mAh g −1 ) than that of the current standard material of LiCoO 2 (280 mAh g −1 ) [5][6][7][8][9][10] . In practice, however, the Li-excess oxides show severe degradations during charge/discharge cycles, which is significant even in the first or second cycles 11,12 .…”

Multiorbital bond formation for stable oxygen-redox reaction in battery electrodes

“…17 In addition, the electronic states of various oxygen-redox electrode materials have been intensively investigated using analytical methods such as X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, X-ray emission spectroscopy (or resonant inelastic X-ray scattering (RIXS)), or density functional theory (DFT) calculations. [18][19][20][21][22] However, despite the theoretical adequacy of the proposed ''orphaned'' oxygen 2p orbital hypothesis, the presence of the localized oxygen 2p orbitals in Li-excess transition-metal oxides has not been verified experimentally. Furthermore, although localized, the oxygen 2p orbital along the Li-O-Li axis still exhibits p-type interactions with the M t 2g orbital, which should play an essential role in oxygen-redox reactions.…”

Multiscale factors in designing alkali-ion (Li, Na, and K) transition metal inorganic compounds for next-generation rechargeable batteries

“…180 Although the cation disorder in layered materials was considered as stationary or partially reversible, novel cases of overcoming the octahedra. 184 Thereby, reversible TM ion migration to original TM layer during re-lithiation as well as prevention of the movement in the intra-layer of Li slab was observed resulting in enhanced electrochemical performances ( Fig. 13a-b).…”