Abstract
Lithium-sulfur separator behavior emerges across interacting scales: surface chemistry and nanopores influence polysulfide transport, which shapes cell-level cycling and eventually batch-level reliability. This review examines how AI can connect those scales without replacing mechanism with correlation. Graph neural networks and attention-based sequence models are considered for representing material structure and temporal electrochemistry, while physics-informed constraints and probabilistic layers preserve known transport relationships and uncertainty. Validation is organized hierarchically, requiring success within each scale, consistency across interfaces, and external testing under changed materials, protocols, and equipment. The synthesis warns that shared trends across simulations and experiments are not proof of causal transfer. It proposes a lifecycle evidence graph linking samples, models, comparators, errors, manufacturing decisions, and operational outcomes, with named owners for each scale transition. The work is a critical review and introduces no new cell or production dataset. Its contribution is an accountable cross-scale modelling framework in which AI helps integrate evidence, but scale-up decisions remain conditioned on mechanism, provenance, calibration, and clearly stated failure consequences.
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