# Next-Generation Batteries: State of the Field (October 2026)

Research dossier · v1 · updated 2026-10-30 · 3,533 words · 61 sources · 29 claims · verification: verified

This dossier surveys solid-state electrolytes, lithium-metal and silicon anodes, sodium-ion chemistries and computational degradation work as of October 2026. Its key takeaway is that bulk ionic conductivity is no longer the main obstacle for sulfide electrolytes; interfaces, mechanics and stack pressure now dominate the remaining development effort, and most 2026 evidence is still at preprint stage.

## Contents

- Executive summary
- Background and core concepts
- Timeline of key milestones
- State of the art
  - Inorganic solid electrolytes: sulfides, oxides and halides
  - Interfaces, interphases and mechanics
  - Lithium-metal anodes and dendrites
  - Silicon and other anodes
  - Sodium-ion and other post-lithium chemistries
  - Polymer and composite electrolytes
  - Computational and machine-learning approaches
  - Quantitative benchmarks
- Open problems and active debates
- Major programs and players
- Outlook: what to watch (next 12-18 months)
- Key papers
- Glossary

## Sample findings

- Li10GeP2S12 (LGPS) was reported in 2011 by its authors with a room-temperature bulk Li-ion conductivity of 12 mS per cm, an early benchmark for sulfide solid electrolytes.
- A sulfide superionic conductor was reported by its authors in 2016 with a room-temperature bulk conductivity of 25 mS per cm, the highest bulk value among the sources cited here.

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