Stable LCO Cathodes Charged at 4.6 V for High Energy Secondary Li-ion Batteries by One-Pot Dual Metal Fluorides Coating

Villa Krishna Harika, Tirupathi Rao Penki, Tianju Fan, Perumal Elumalai, Netanel Shpigel, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

Abstract

LiCoO2 (LCO) has been the cathode material of choice for three decades for durable, lightweight Li-ion storage systems. Being charged up to 4.2 V versus Li/Li+, LCO provides excellent cycling stability with a specific capacity of ≈140 mAh g−1. Raising the cut-off voltage to 4.6 V improves capacity by up to 60% however, it leads to rapid degradation of the cathode structure. Here, a one-pot dual coating of MgF2 and AlF3 with fluorinated electrolyte additives achieves 190 mAh g−1 at a 0.5 C rate after 400 cycles with a capacity retention of 93%. Various analytical tools are used to follow the structural and morphological changes during cycling. Synergistically, ion transport is improved, and detrimental interfacial side reactions with the electrolyte solutions are fully mitigated. Structural stability is thus improved by using this coating, with only a little loss of the active material. This work provides a brief guideline for designing dual metal-ion-based surface coatings in various electrolytes to develop high-voltage cathode systems for Li and maybe also Na batteries.

Original languageEnglish
JournalAdvanced Energy Materials
DOIs
StateAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

Keywords

  • high energy density batteries
  • high voltage LiCoO
  • one-pot dual coating
  • surface modification

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