TY - JOUR AU - Rohit Satish AU - Lennart Wichmann AU - Matthew J Crafton AU - Raynald Giovine AU - Linze Li AU - Juhyeon Ahn AU - Yuan Yue AU - Wei Tong AU - Guoying Chen AU - Chongmin Wang AU - Raphaële J Clément AU - Robert Kostecki AB -

The application of lithium rich disordered rock salts (DRX) as cathode materials has greatly expanded the materials space for high energy density cathodes. These materials are able to consistently achieve capacities higher than urn:x-wiley:21960216:media:celc202100891:celc202100891-math-0001 via a complex percolation based intercalation mechanism. Most current DRX materials face significant capacity fade when cycled over an extended period. One of the factors responsible for this could be deleterious side effect of interface reactions between the electrode and electrolyte at high voltage. We aim to focus on one aspect of this interaction, i.e the effect of exposure to electrolyte on the surface and its effect on the electrochemical properties of urn:x-wiley:21960216:media:celc202100891:celc202100891-math-0002 (LMNOF) powder. LMNOF was systematically treated in an electrolyte solution for varying periods of time at an elevated temperature. Treated samples exhibit surface layer modification (removal of F rich surface layer), leading to a 10 % improvement in the capacity retention behavior of LMNOF. Surface and bulk based measurements indicate an increase in disorder and gradual removal of F and Li. All of these processes mimic an aging process similar to cycling. This a priori formed interface allows for increased stability with respect to retention of capacity and oxygen loss.

BT - ChemElectroChem DA - 10/2021 DO - 10.1002/celc.202100891 IS - 20 LA - eng N2 -

The application of lithium rich disordered rock salts (DRX) as cathode materials has greatly expanded the materials space for high energy density cathodes. These materials are able to consistently achieve capacities higher than urn:x-wiley:21960216:media:celc202100891:celc202100891-math-0001 via a complex percolation based intercalation mechanism. Most current DRX materials face significant capacity fade when cycled over an extended period. One of the factors responsible for this could be deleterious side effect of interface reactions between the electrode and electrolyte at high voltage. We aim to focus on one aspect of this interaction, i.e the effect of exposure to electrolyte on the surface and its effect on the electrochemical properties of urn:x-wiley:21960216:media:celc202100891:celc202100891-math-0002 (LMNOF) powder. LMNOF was systematically treated in an electrolyte solution for varying periods of time at an elevated temperature. Treated samples exhibit surface layer modification (removal of F rich surface layer), leading to a 10 % improvement in the capacity retention behavior of LMNOF. Surface and bulk based measurements indicate an increase in disorder and gradual removal of F and Li. All of these processes mimic an aging process similar to cycling. This a priori formed interface allows for increased stability with respect to retention of capacity and oxygen loss.

PY - 2021 SP - 3982 EP - 3991 ST - ChemElectroChem T2 - ChemElectroChem TI - Exposure History and its Effect Towards Stabilizing Li Exchange Across Disordered Rock Salt Interfaces UR - https://onlinelibrary.wiley.com/toc/21960216/8/20 VL - 8 SN - 2196-0216 ER -