Influence of Al and F Surface Modifications on the Sudden Death Effect of Si-Gr/Li1.2Ni0.2Mn0.6O2 Li-Ion Cells - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Electrochimica Acta Year : 2021

Influence of Al and F Surface Modifications on the Sudden Death Effect of Si-Gr/Li1.2Ni0.2Mn0.6O2 Li-Ion Cells

Abstract

The dissolution, migration and deposition (DMD process) of transition metal ions during cycling is a well-known phenomenon reported in literature especially concerning high manganese spinel cathode0246810121416182001020304050Pouch capacity (mAh)Cycle index12SuddendeatheffectManganesedetectionat the anode sidePoint 1Point 22material. The main approach to solve this issue consists in coating or doping the particles surface with electrochemically inert cations and/or anions. In this study, we describe a DMD process mechanism which happens in the silicon-graphite/lithium rich layered oxide (Si-Gr/Li1.2Ni0.2Mn0.6O2) systems. This phenomenon leads to a sudden death effect of the cell after 20 cycles. AlF3 coating is envisaged to limit the cation dissolution from the positive electrode: we highlight that our synthesis finally results in improving the electrochemical performances of lithium rich layered oxides by offering an Al/F doped surface. Despite this improvement, the coating fails, on the other hand, to stop the transition metal cations dissolution, especially in Li-ion cells (Si-Gr as anode).
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Dates and versions

cea-03448492 , version 1 (05-01-2024)

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Attribution - NonCommercial

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David Peralta, Jérémie Salomon, Jean-Frederic Martin, Eric de Vito, Jean-François Colin, et al.. Influence of Al and F Surface Modifications on the Sudden Death Effect of Si-Gr/Li1.2Ni0.2Mn0.6O2 Li-Ion Cells. Electrochimica Acta, 2021, 400, pp.139419. ⟨10.1016/j.electacta.2021.139419⟩. ⟨cea-03448492⟩
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