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Time and space reso...
Time and space resolved operando synchrotron X-ray and Neutron diffraction study of NMC811/Si–Gr 5 Ah pouch cells
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- Graae, Kristoffer Visti (författare)
- Technical University of Denmark
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- Li, Xinyu (författare)
- Technical University of Denmark
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- Sørensen, Daniel Risskov (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Aarhus University
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Ayerbe, Elixabete (författare)
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Boyano, Iker (författare)
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- Sheptyakov, Denis (författare)
- Paul Scherrer Institute
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- Jørgensen, Mads Ry Vogel (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Aarhus University
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- Norby, Poul (författare)
- Technical University of Denmark
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(creator_code:org_t)
- 2023
- 2023
- Engelska.
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Ingår i: Journal of Power Sources. - 0378-7753. ; 570
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Silicon–Graphite blended electrodes in Li-ion batteries have been proposed as a way to harness the high capacity of Si as an anode material, while minimising the negative effects of their large volume expansion. NMC 811 is the current state-of-the-art layered oxide cathode material, where the cobalt content of the cathode has been minimised. These are the two of the most promising materials for achieving electric vehicle targets in terms of performance, cyclability and price, however their degradation mechanism is not fully understood. Here these two materials have been used to manufacture 5 Ah prototype multi-layer pouch cells, which are aged and then studied using two complimentary diffraction techniques. Neutron diffraction has enabled a quantitative analysis of phase transitions in Si–Gr anodes in a pristine and degraded cell, and the alloying behaviour of Si and Li has been inferred by comparison of identical cells with either graphite or Si–Gr anodes. Synchrotron X-ray Diffraction has been used to make an operando 2D map of the cathode and anode lithiation in the pouch cell, as well as to map the volume expansion across the cell. This approach has revealed that degradation entails significant inhomogeneities across both electrodes, linked to the inhomogeneous volume expansion of the Si–Gr anodes.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- In situ
- Neutron diffraction
- NMC 811
- Pouch cell
- Silicon–graphite
- XRD
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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