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README.md

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-license: apache-2.0
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+# Solid-State Battery (SSB) Screening – SSL Corpus
+
+This dataset contains inorganic crystal structures sourced from the Materials Project
+for self-supervised and weakly supervised representation learning in solid-state
+battery electrolyte screening.
+
+## Format
+- Parquet (Arrow) with ZSTD compression
+- One row per structure
+- Fields: `mp_id`, `elements`, `atomic_numbers`, `fractional_coords`, `lattice`, `spacegroup_number`, `reduced_formula`, `tier`, and optional metadata
+
+## Tiers
+- `electrolyte_relevant`
+- `general_inorganic`
+- `hard_negative`