Atomic layer fluorination of 5 V class positive electrode material LiCoPO4 for enhanced electrochemical performance

Sanghoon Kim; Eun Jeong Kim; Youn Charles-Blin; Katia Guérin; Marc Dubois; Delphine Flahaut; Herve Martinez; Michaël  Deschamps; David Noel Miller; John T. S. Irvine; Robert Armstrong; Laure Monconduit; Nicolas Louvain

doi:10.1002/batt.202000041

Atomic layer fluorination of 5 V class positive electrode material LiCoPO₄ for enhanced electrochemical performance

Sanghoon Kim, Eun Jeong Kim, Youn Charles-Blin, Katia Guérin, Marc Dubois, Delphine Flahaut, Herve Martinez, Michaël Deschamps, David Noel Miller, John T. S. Irvine, Robert Armstrong, Laure Monconduit, Nicolas Louvain

Research output: Contribution to journal › Article › peer-review

Abstract

The surface fluorination of lithium cobalt phosphate (LiCoPO₄, LCP) using a one‐step, room temperature processable, easily up‐scalable and dry surface modification method with XeF₂ as fluorine source was developed. After fluorination, fluorine‐rich nanoparticles were observed mainly on the particle surface, which facilitates the improvement of surface stability and electrochemical performance such as cycling stability and rate capability, as the fluorinated LCP can be protected against side reactions with electrolyte or by‐products of electrolyte decomposition at high voltage (5 V). More importantly, the direct surface fluorination proved more efficient than adding a fluorinated electrolyte additive (i. e., FEC). These results suggest that surface fluorination using XeF₂ is of great promise for practical applications of high voltage positive materials for lithium‐ion batteries.

Original language	English
Journal	Batteries and Supercaps
Volume	Early View
Early online date	23 Jun 2020
DOIs	https://doi.org/10.1002/batt.202000041
Publication status	E-pub ahead of print - 23 Jun 2020

Keywords

LCP
Fluorination
X-ray photoelectron spectroscopy
Lithium-ion battery

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Copyright © 2020 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/batt.202000041
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Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale
Samuel, I. D. W. (PI)
EPSRC
1/10/13 → 30/09/23
Project: Standard

Cite this

Kim, S., Kim, E. J., Charles-Blin, Y., Guérin, K., Dubois, M., Flahaut, D., Martinez, H., Deschamps, M., Miller, D. N., Irvine, J. T. S., Armstrong, R., Monconduit, L., & Louvain, N. (2020). Atomic layer fluorination of 5 V class positive electrode material LiCoPO₄ for enhanced electrochemical performance. Batteries and Supercaps, Early View. Advance online publication. https://doi.org/10.1002/batt.202000041

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title = "Atomic layer fluorination of 5 V class positive electrode material LiCoPO4 for enhanced electrochemical performance",

abstract = "The surface fluorination of lithium cobalt phosphate (LiCoPO4, LCP) using a one‐step, room temperature processable, easily up‐scalable and dry surface modification method with XeF2 as fluorine source was developed. After fluorination, fluorine‐rich nanoparticles were observed mainly on the particle surface, which facilitates the improvement of surface stability and electrochemical performance such as cycling stability and rate capability, as the fluorinated LCP can be protected against side reactions with electrolyte or by‐products of electrolyte decomposition at high voltage (5 V). More importantly, the direct surface fluorination proved more efficient than adding a fluorinated electrolyte additive (i. e., FEC). These results suggest that surface fluorination using XeF2 is of great promise for practical applications of high voltage positive materials for lithium‐ion batteries.",

keywords = "LCP, Fluorination, X-ray photoelectron spectroscopy, Lithium-ion battery",

author = "Sanghoon Kim and Kim, {Eun Jeong} and Youn Charles-Blin and Katia Gu{\'e}rin and Marc Dubois and Delphine Flahaut and Herve Martinez and Micha{\"e}l Deschamps and Miller, {David Noel} and Irvine, {John T. S.} and Robert Armstrong and Laure Monconduit and Nicolas Louvain",

note = "EJK would like to thank the Alistore ERI for the award of a studentship. The authors thank EPSRC Capital for Great Technologies Grant EP/L017008/1. The authors want to thank the French Research Network on the Electrochemical Energy Storage (RS2E) for YCB{\textquoteright}s PhD grant. MD and NL are indebted to the IR-RMN-THC FR3050 CNRS for the spectrometer time access and the financial support of the NMR experiments.",

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month = jun,

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doi = "10.1002/batt.202000041",

language = "English",

volume = "Early View",

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T1 - Atomic layer fluorination of 5 V class positive electrode material LiCoPO4 for enhanced electrochemical performance

AU - Kim, Sanghoon

AU - Kim, Eun Jeong

AU - Charles-Blin, Youn

AU - Guérin, Katia

AU - Dubois, Marc

AU - Flahaut, Delphine

AU - Martinez, Herve

AU - Deschamps, Michaël

AU - Miller, David Noel

AU - Irvine, John T. S.

AU - Armstrong, Robert

AU - Monconduit, Laure

AU - Louvain, Nicolas

N1 - EJK would like to thank the Alistore ERI for the award of a studentship. The authors thank EPSRC Capital for Great Technologies Grant EP/L017008/1. The authors want to thank the French Research Network on the Electrochemical Energy Storage (RS2E) for YCB’s PhD grant. MD and NL are indebted to the IR-RMN-THC FR3050 CNRS for the spectrometer time access and the financial support of the NMR experiments.

PY - 2020/6/23

Y1 - 2020/6/23

N2 - The surface fluorination of lithium cobalt phosphate (LiCoPO4, LCP) using a one‐step, room temperature processable, easily up‐scalable and dry surface modification method with XeF2 as fluorine source was developed. After fluorination, fluorine‐rich nanoparticles were observed mainly on the particle surface, which facilitates the improvement of surface stability and electrochemical performance such as cycling stability and rate capability, as the fluorinated LCP can be protected against side reactions with electrolyte or by‐products of electrolyte decomposition at high voltage (5 V). More importantly, the direct surface fluorination proved more efficient than adding a fluorinated electrolyte additive (i. e., FEC). These results suggest that surface fluorination using XeF2 is of great promise for practical applications of high voltage positive materials for lithium‐ion batteries.

AB - The surface fluorination of lithium cobalt phosphate (LiCoPO4, LCP) using a one‐step, room temperature processable, easily up‐scalable and dry surface modification method with XeF2 as fluorine source was developed. After fluorination, fluorine‐rich nanoparticles were observed mainly on the particle surface, which facilitates the improvement of surface stability and electrochemical performance such as cycling stability and rate capability, as the fluorinated LCP can be protected against side reactions with electrolyte or by‐products of electrolyte decomposition at high voltage (5 V). More importantly, the direct surface fluorination proved more efficient than adding a fluorinated electrolyte additive (i. e., FEC). These results suggest that surface fluorination using XeF2 is of great promise for practical applications of high voltage positive materials for lithium‐ion batteries.

KW - LCP

KW - Fluorination

KW - X-ray photoelectron spectroscopy

KW - Lithium-ion battery

U2 - 10.1002/batt.202000041

DO - 10.1002/batt.202000041

M3 - Article

SN - 2566-6223

VL - Early View

JO - Batteries and Supercaps

JF - Batteries and Supercaps

ER -