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Investigating the Limit of Lithium Difluorophosphate Electrolyte Additive for High-Voltage Li/Mn-Rich Layered Oxide || Graphite Cells
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  • Anindityo Arifiadi,
  • Feleke Demelash,
  • Tobias Brake,
  • Christian Lechtenfeld,
  • Sven Klein,
  • Simon Wiemers-Meyer,
  • Martin Winter,
  • Johannes Kasnatscheew
Anindityo Arifiadi
University of Münster
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Feleke Demelash
University of Münster
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Tobias Brake
University of Münster
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Christian Lechtenfeld
University of Münster
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Sven Klein
University of Münster
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Simon Wiemers-Meyer
University of Münster
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Martin Winter
University of Münster
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Johannes Kasnatscheew
University of Münster

Corresponding Author:johannes.kasnatscheew@wwu.de

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Abstract

Li/Mn-rich layered oxide (LMR) cathode active materials offer remarkably high specific discharge capacity (>250 mAh g-1) stemming from both cationic and anionic redox. The latter necessitates harsh charging conditions to high cathode potentials (>4.5 V vs. Li|Li+), which is accompanied by lattice oxygen release, phase transformation, voltage fade, and transition metal (TM) dissolution. In cells with graphite anode, TM dissolution is particularly detrimental as it initiates electrode crosstalk. Lithium difluorophosphate (LiDFP) is known for its pivotal role in suppressing electrode crosstalk through TM scavenging. In LMR || graphite cells charged to an upper cut-off voltage (UCV) of 4.5 V, effective TM scavenging effects of LiDFP is observed. In contrast, in cells with an UCV of 4.7 V, the scavenging effects is limited due to more severe TM dissolution compared an UCV of 4.5 V. Worth noting, the low solubility limit of the TM scavenging agents, e.g., PO43- and PO3F2-, which are the decomposition products of LiDFP, cannot scavenge additional TMs, even when higher LiDFP concentration are added to the electrolyte and can even worsen the performance.
Submitted to Energy & Environmental Materials
Submission Checks Completed
Assigned to Editor
Reviewer(s) Assigned
08 Jul 2024Review(s) Completed, Editorial Evaluation Pending
11 Aug 2024Editorial Decision: Revise Minor
23 Aug 20241st Revision Received
24 Aug 2024Submission Checks Completed
24 Aug 2024Assigned to Editor
24 Aug 2024Review(s) Completed, Editorial Evaluation Pending
24 Aug 2024Reviewer(s) Assigned
29 Aug 2024Editorial Decision: Accept