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Enhanced cycling performance of magnesium doped lithium cobalt phosphate

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Kim_2019_CEC_Cyclingperformance_AAM.pdf (1.776Mb)
Date
26/09/2019
Author
Kim, Eun Jeong
Miller, David
Irvine, John T. S.
Armstrong, A. Robert
Keywords
Lithium cobalt phosphate
Lithium ion battery
Magnesium doping
High voltage positive electrode materials
Operando XRD
QD Chemistry
T-NDAS
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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.
Citation
Kim , E J , Miller , D , Irvine , J T S & Armstrong , A R 2019 , ' Enhanced cycling performance of magnesium doped lithium cobalt phosphate ' , ChemElectroChem , vol. 6 , no. 18 . https://doi.org/10.1002/celc.201901372
Publication
ChemElectroChem
Status
Peer reviewed
DOI
https://doi.org/10.1002/celc.201901372
ISSN
2196-0216
Type
Journal article
Rights
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
Description
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.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20689

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