TY - JOUR
T1 - Stable LCO Cathodes Charged at 4.6 V for High Energy Secondary Li-ion Batteries by One-Pot Dual Metal Fluorides Coating
AU - Harika, Villa Krishna
AU - Penki, Tirupathi Rao
AU - Fan, Tianju
AU - Elumalai, Perumal
AU - Shpigel, Netanel
AU - Aurbach, Doron
N1 - Publisher Copyright:
© 2024 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.
PY - 2024
Y1 - 2024
N2 - 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.
AB - 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.
KW - high energy density batteries
KW - high voltage LiCoO
KW - one-pot dual coating
KW - surface modification
UR - http://www.scopus.com/inward/record.url?scp=85206620463&partnerID=8YFLogxK
U2 - 10.1002/aenm.202402794
DO - 10.1002/aenm.202402794
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AN - SCOPUS:85206620463
SN - 1614-6832
JO - Advanced Energy Materials
JF - Advanced Energy Materials
ER -