Degradation mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 Li-ion batteries unraveled by non-destructive and post-mortem methods

Dongjiang Li, Hu Li, Dmitri L. Danilov, Lu Gao, Xiaoxuan Chen, Zhongru Zhang, Jiang Zhou, Rüdiger A. Eichel, Yong Yang (Corresponding author), Peter H.L. Notten (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

The ageing mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 batteries at various discharging currents and temperatures have systematically been investigated with electrochemical and post-mortem analyses. The irreversible capacity losses (ΔQir) at various ageing conditions are calculated on the basis of regularly determined electromotive force (EMF) curves. Two stages can be distinguished for the degradation of the storage capacity at 30 °C. The first stage includes SEI formation, cathode dissolution, etc. The second stage is related to battery polarization. The various degradation mechanisms of the individual electrodes have been distinguished by dVEMF/dQ vs Qout and dVEMF/dQ vs V plots. The Solid-Electrolyte-Interface (SEI) formation as well as the electrode degradation has been experimentally confirmed by XPS analyses. Both Ni and Mn elements are detected at the anode while Co is absent, indicating that the bonding of Co atoms is more robust in the cathode host structure. A Cathode-Electrolyte-Interface (CEI) layer is also detected at the cathode surface. The composition of the CEI layer includes Li salts, such as LiF, LiCOOR, as well as transition metal compounds like NiF2. Cathode dissolution is considered to be responsible for both the NiF2 detected at the cathode and Ni at the anode.

LanguageEnglish
Pages163-174
Number of pages12
JournalJournal of Power Sources
Volume416
DOIs
StatePublished - 15 Mar 2019

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electric batteries
Cathodes
cathodes
degradation
Degradation
Electromotive force
electromotive forces
ions
Solid electrolytes
solid electrolytes
Electrolytes
Anodes
dissolving
Dissolution
anodes
Aging of materials
electrolytes
Transition metal compounds
Electrodes
electrodes

Keywords

  • Electrode degradation
  • Electromotive force
  • Irreversible capacity loss
  • Li-ion battery
  • Solid-electrolyte-interphase

Cite this

Li, Dongjiang ; Li, Hu ; Danilov, Dmitri L. ; Gao, Lu ; Chen, Xiaoxuan ; Zhang, Zhongru ; Zhou, Jiang ; Eichel, Rüdiger A. ; Yang, Yong ; Notten, Peter H.L./ Degradation mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 Li-ion batteries unraveled by non-destructive and post-mortem methods. In: Journal of Power Sources. 2019 ; Vol. 416. pp. 163-174
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abstract = "The ageing mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 batteries at various discharging currents and temperatures have systematically been investigated with electrochemical and post-mortem analyses. The irreversible capacity losses (ΔQir) at various ageing conditions are calculated on the basis of regularly determined electromotive force (EMF) curves. Two stages can be distinguished for the degradation of the storage capacity at 30 °C. The first stage includes SEI formation, cathode dissolution, etc. The second stage is related to battery polarization. The various degradation mechanisms of the individual electrodes have been distinguished by dVEMF/dQ vs Qout and dVEMF/dQ vs V plots. The Solid-Electrolyte-Interface (SEI) formation as well as the electrode degradation has been experimentally confirmed by XPS analyses. Both Ni and Mn elements are detected at the anode while Co is absent, indicating that the bonding of Co atoms is more robust in the cathode host structure. A Cathode-Electrolyte-Interface (CEI) layer is also detected at the cathode surface. The composition of the CEI layer includes Li salts, such as LiF, LiCOOR, as well as transition metal compounds like NiF2. Cathode dissolution is considered to be responsible for both the NiF2 detected at the cathode and Ni at the anode.",
keywords = "Electrode degradation, Electromotive force, Irreversible capacity loss, Li-ion battery, Solid-electrolyte-interphase",
author = "Dongjiang Li and Hu Li and Danilov, {Dmitri L.} and Lu Gao and Xiaoxuan Chen and Zhongru Zhang and Jiang Zhou and Eichel, {R{\"u}diger A.} and Yong Yang and Notten, {Peter H.L.}",
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Degradation mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 Li-ion batteries unraveled by non-destructive and post-mortem methods. / Li, Dongjiang; Li, Hu; Danilov, Dmitri L.; Gao, Lu; Chen, Xiaoxuan; Zhang, Zhongru; Zhou, Jiang; Eichel, Rüdiger A.; Yang, Yong (Corresponding author); Notten, Peter H.L. (Corresponding author).

In: Journal of Power Sources, Vol. 416, 15.03.2019, p. 163-174.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Degradation mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 Li-ion batteries unraveled by non-destructive and post-mortem methods

AU - Li,Dongjiang

AU - Li,Hu

AU - Danilov,Dmitri L.

AU - Gao,Lu

AU - Chen,Xiaoxuan

AU - Zhang,Zhongru

AU - Zhou,Jiang

AU - Eichel,Rüdiger A.

AU - Yang,Yong

AU - Notten,Peter H.L.

PY - 2019/3/15

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N2 - The ageing mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 batteries at various discharging currents and temperatures have systematically been investigated with electrochemical and post-mortem analyses. The irreversible capacity losses (ΔQir) at various ageing conditions are calculated on the basis of regularly determined electromotive force (EMF) curves. Two stages can be distinguished for the degradation of the storage capacity at 30 °C. The first stage includes SEI formation, cathode dissolution, etc. The second stage is related to battery polarization. The various degradation mechanisms of the individual electrodes have been distinguished by dVEMF/dQ vs Qout and dVEMF/dQ vs V plots. The Solid-Electrolyte-Interface (SEI) formation as well as the electrode degradation has been experimentally confirmed by XPS analyses. Both Ni and Mn elements are detected at the anode while Co is absent, indicating that the bonding of Co atoms is more robust in the cathode host structure. A Cathode-Electrolyte-Interface (CEI) layer is also detected at the cathode surface. The composition of the CEI layer includes Li salts, such as LiF, LiCOOR, as well as transition metal compounds like NiF2. Cathode dissolution is considered to be responsible for both the NiF2 detected at the cathode and Ni at the anode.

AB - The ageing mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 batteries at various discharging currents and temperatures have systematically been investigated with electrochemical and post-mortem analyses. The irreversible capacity losses (ΔQir) at various ageing conditions are calculated on the basis of regularly determined electromotive force (EMF) curves. Two stages can be distinguished for the degradation of the storage capacity at 30 °C. The first stage includes SEI formation, cathode dissolution, etc. The second stage is related to battery polarization. The various degradation mechanisms of the individual electrodes have been distinguished by dVEMF/dQ vs Qout and dVEMF/dQ vs V plots. The Solid-Electrolyte-Interface (SEI) formation as well as the electrode degradation has been experimentally confirmed by XPS analyses. Both Ni and Mn elements are detected at the anode while Co is absent, indicating that the bonding of Co atoms is more robust in the cathode host structure. A Cathode-Electrolyte-Interface (CEI) layer is also detected at the cathode surface. The composition of the CEI layer includes Li salts, such as LiF, LiCOOR, as well as transition metal compounds like NiF2. Cathode dissolution is considered to be responsible for both the NiF2 detected at the cathode and Ni at the anode.

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KW - Li-ion battery

KW - Solid-electrolyte-interphase

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