Prof. Nan Jian, University of Illinois at Chicago, USA

For more information on attending this talk:  http://talks.cam.ac.uk/show/index/98965

Speaker: Dr. Samuel Cooper, Imperial College, UK

Battery manufacturers want to know the relationship between their manufacturing parameters and the performance of the resulting cell, so that they can optimise their product for particular applications. The literature contains many examples of physics-based models of the various manufacturing processes, including mixing, coating, heat and compression, each of which are hugely complex; expensive to simulate and hard to validate.

Recent advances in generative machine learning (ML) methods have allowed the relationship from manufacturing parameters to microstructure to be directly learned from data.

In this talk, Sam will present a modular approach to the cell optimisation cycle that makes use of these ML methods, in combination with GPU accelerated metric extraction (TauFactor 2), electrochemical cell simulation (PyBaMM), and Bayesian optimisation. In addition, Sam will be introducing a new kintsugi SEM imaging method for accurately observing the nanostructure of the carbon binder domain; “VoxCel” an open-source, voxel-based, GPU accelerated, multi-physics cell simulation; MLs methods for generating 3D data from 2D images, as well as, inpainting artefacts in image data; and a data fusion method for combining multi-modal datasets using GANs. Lastly, Sam will present a webapp that normalises the data obtained from testing cells in a lab for easy comparison to commercial cells: cell-normaliser.

• Join the Teams meeting on the 12 May 2023 

Prof. Andriy Ostapovets, Czech Academy of Sciences

Twinning plays an important role in materials with low symmetry, e.g. hcp metals (Mg, Ti and their alloys). Migration of twin boundaries are often accompanied by deformation of material (deformation and transformation twins). Classical twin boundaries are considered as flat interfaces lying along a plane, which is invariant to twinning shear. However, in general, twin is a 3- dimensional object, which can be bounded by different types of interfaces. Some of these interfaces are significantly different from symmetrical invariant interfaces. Present work discusses unusual twin interfaces in hcp metals. The examples of  such interfaces are less common twins (e.g. (1 1 -2 6) twin) and asymmetrical twin boundaries, which are widely observed during the last years. Connection between twin boundary migration mechanisms and nucleation of asymmetrical facets in twin boundaries is considered.

For more information on attending this talk:  http://talks.cam.ac.uk/show/index/98965