Enhanced cycling performance of magnesium doped lithium cobalt phosphate

Eun Jeong Kim; David Miller; John T. S. Irvine; A. Robert Armstrong

doi:10.1002/celc.201901372

Enhanced cycling performance of magnesium doped lithium cobalt phosphate

Eun Jeong Kim, David Miller, John T. S. Irvine, A. Robert Armstrong

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

Abstract

The cycling performance of LiCoPO₄ (LCP) as a high voltage positive electrode material in lithium‐ion batteries is enhanced by partial magnesium substitution for cobalt. Structural investigation of magnesium‐doped LCP using combined powder neutron and X‐ray diffraction reveals a decrease in anti‐site defects. In addition, the reduced unit cell volume variation during the charging process is observed by operando X‐ray diffraction measurements. Characterisation of the surface shows the presence of a Mg‐rich layer on the surface that might prevent detrimental reactions with the electrolyte. The combined beneficial effects of magnesium doping in LCP result in improved capacity retention.

Original language	English
Journal	ChemElectroChem
Volume	6
Issue number	18
DOIs	https://doi.org/10.1002/celc.201901372
Publication status	Published - 26 Sept 2019

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Lithium cobalt phosphate
Lithium ion battery
Magnesium doping
High voltage positive electrode materials
Operando XRD

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10.1002/celc.201901372

Kim_2019_CEC_Cyclingperformance_AAM
Copyright © 2019 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/celc.201901372
Accepted author manuscript, 1.78 MB

Cite this

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title = "Enhanced cycling performance of magnesium doped lithium cobalt phosphate",

abstract = "The cycling performance of LiCoPO4 (LCP) as a high voltage positive electrode material in lithium‐ion batteries is enhanced by partial magnesium substitution for cobalt. Structural investigation of magnesium‐doped LCP using combined powder neutron and X‐ray diffraction reveals a decrease in anti‐site defects. In addition, the reduced unit cell volume variation during the charging process is observed by operando X‐ray diffraction measurements. Characterisation of the surface shows the presence of a Mg‐rich layer on the surface that might prevent detrimental reactions with the electrolyte. The combined beneficial effects of magnesium doping in LCP result in improved capacity retention.",

keywords = "Lithium cobalt phosphate, Lithium ion battery, Magnesium doping, High voltage positive electrode materials, Operando XRD",

author = "Kim, \{Eun Jeong\} and David Miller and Irvine, \{John T. S.\} and Armstrong, \{A. Robert\}",

note = "EJK would like to thank the Alistore ERI for the award of a studentship, ScotChem for an award of postgraduate and early career researcher exchanges (PECRE) and Christian Masquelier for his supervision at LRCS. The authors thank EPSRC Capital for Great Technologies Grant EP/L017008/1.",

year = "2019",

month = sep,

day = "26",

doi = "10.1002/celc.201901372",

language = "English",

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journal = "ChemElectroChem",

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publisher = "John Wiley \& Sons, Ltd",

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T1 - Enhanced cycling performance of magnesium doped lithium cobalt phosphate

AU - Kim, Eun Jeong

AU - Miller, David

AU - Irvine, John T. S.

AU - Armstrong, A. Robert

N1 - EJK would like to thank the Alistore ERI for the award of a studentship, ScotChem for an award of postgraduate and early career researcher exchanges (PECRE) and Christian Masquelier for his supervision at LRCS. The authors thank EPSRC Capital for Great Technologies Grant EP/L017008/1.

PY - 2019/9/26

Y1 - 2019/9/26

N2 - The cycling performance of LiCoPO4 (LCP) as a high voltage positive electrode material in lithium‐ion batteries is enhanced by partial magnesium substitution for cobalt. Structural investigation of magnesium‐doped LCP using combined powder neutron and X‐ray diffraction reveals a decrease in anti‐site defects. In addition, the reduced unit cell volume variation during the charging process is observed by operando X‐ray diffraction measurements. Characterisation of the surface shows the presence of a Mg‐rich layer on the surface that might prevent detrimental reactions with the electrolyte. The combined beneficial effects of magnesium doping in LCP result in improved capacity retention.

AB - The cycling performance of LiCoPO4 (LCP) as a high voltage positive electrode material in lithium‐ion batteries is enhanced by partial magnesium substitution for cobalt. Structural investigation of magnesium‐doped LCP using combined powder neutron and X‐ray diffraction reveals a decrease in anti‐site defects. In addition, the reduced unit cell volume variation during the charging process is observed by operando X‐ray diffraction measurements. Characterisation of the surface shows the presence of a Mg‐rich layer on the surface that might prevent detrimental reactions with the electrolyte. The combined beneficial effects of magnesium doping in LCP result in improved capacity retention.

KW - Lithium cobalt phosphate

KW - Lithium ion battery

KW - Magnesium doping

KW - High voltage positive electrode materials

KW - Operando XRD

UR - https://www.scopus.com/pages/publications/85073186734

U2 - 10.1002/celc.201901372

DO - 10.1002/celc.201901372

M3 - Article

SN - 2196-0216

VL - 6

JO - ChemElectroChem

JF - ChemElectroChem

IS - 18

ER -

Enhanced cycling performance of magnesium doped lithium cobalt phosphate

Abstract

UN SDGs

Keywords

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Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale

Positive electrode materials for high energy rechargeable batteries

Cite this

Enhanced cycling performance of magnesium doped lithium cobalt phosphate

Abstract

UN SDGs

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale

Student theses

Positive electrode materials for high energy rechargeable batteries

Cite this