OxTalks will soon move to the new Halo platform and will become 'Oxford Events.' There will be a need for an OxTalks freeze. This was previously planned for Friday 14th November – a new date will be shared as soon as it is available (full details will be available on the Staff Gateway).
In the meantime, the OxTalks site will remain active and events will continue to be published.
If staff have any questions about the Oxford Events launch, please contact halo@digital.ox.ac.uk
The manufacture of state-of-art Li-ion batteries require the consideration of $/KWh at cell and pack level at end of life (EOL) ie 80% capacity retention after 1000s of cycles. As a result, we need to simultaneously increase cell performance and longevity.
Extending battery lifetimes in state-of-the-art batteries requires an academic understanding of degradation processes within industry-like manufactured cells. Ideally, we would like to directly observe the intercalation reactions directly within the real cells as a function of cycling to trace the origins of degradation. Unfortunately, most operando studies of these batteries employ either ½-coin cell configurations and/are compromised cells to cater the geometry of the X-ray experiments.
Here, I will summarise our recent developments to employ industry-like cells with in-house x-ray diffraction/absorption and electron microscopy to track the degradation in Ni-rich NMC (NMC811) // graphite single-layer pouch cells after prolonged cycling.1 This new capability enables us to examine the fundamental intercalation reactions occurring in real cells under drive cycles for electric vehicle applications. As a result, it provides new insight into the origin of oxygen loss induced degradation. In state-of-art Ni-rich cell chemistries.[1,-4]
[1] PRX Energy (2024, in press) – 10.26434/chemrxiv-2023-zs9kp-v2
[2] Chemical Reviews 122 (2022), 5641-5681
[3] Joule 7 (2023) 1623-1640
[4] ACS Energy Letters 8 (2023), 5025-5031
