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Title: Exposure History and its Effect Towards Stabilizing Li Exchange Across Disordered Rock Salt Interfaces

Journal Article · · ChemElectroChem
ORCiD logo [1];  [2];  [3];  [4];  [5];  [1];  [1];  [1];  [1];  [5];  [4]; ORCiD logo [1]
  1. Energy Storage and Distributed Resources Division Lawrence Berkeley National Laboratory Berkeley USA CA, 94720
  2. MEET Battery Research Center University of Münster Corrensstraße 46 D-48149 Münster Germany
  3. Energy Storage and Distributed Resources Division Lawrence Berkeley National Laboratory Berkeley USA CA, 94720, Department of Chemical and Biomolecular Engineering University of California Berkeley CA 94720 USA
  4. Materials Department University of California Santa Barbara Santa Barbara USA CA, 93106
  5. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory 902 Battelle Boulevard Richland Washington 99354 United States

Abstract 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 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 (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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1829172
Journal Information:
ChemElectroChem, Journal Name: ChemElectroChem Journal Issue: 20 Vol. 8; ISSN 2196-0216
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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