CryinGAN: Design and evaluation of point-cloud-based generative adversarial networks using disordered materials - application to Li_3ScCl_6-LiCoO_2 battery interfaces
arxiv(2024)
摘要
Generative models have received significant attention in recent years for
materials science applications, particularly in the area of inverse design for
materials discovery. While current efforts have mainly focused on bulk
materials with relatively small unit cells, the possibility of generative
models for more complex, disordered materials would significantly extent the
current capabilities of generative modeling. Generative models would also
benefit from better ways to assess their performance. They are typically
evaluated on the new, unverified materials being generated, which give limited
metrics for evaluation. In this work, we design and evaluate models intended
for disordered interface structure generation. Using a disordered
Li_3ScCl_6-LiCoO_2 battery interface, we tested different
point-cloud-based generative adversarial network architectures that further
include bond distance information in the discriminator, rather than only atomic
coordinates. By working with a fixed material system, we evaluated the model
performance through direct comparisons between training and generated
structures. The best performing architecture, Crystal Interface Generative
Adversarial Network (CryinGAN), uses two separate 1D convolutional
discriminators, one that accepts coordinates and another that accepts bond
distances as input. We demonstrate that CryinGAN is able to successfully
generate low-interface-energy structures for systems with > 250 atoms, in which
the generated interfaces are structurally similar to the training structures.
This study highlights the capabilities of a relatively simple generative model
in generating large disordered materials, and discusses the limitations of the
point cloud representation. Insights are provided to help guide the development
of future generative models that are useful to not just disordered, but also
ordered materials.
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