All-Solid-State Batteries: Next-Gen Lithium Solution

All-solid-state batteries represent a transformative advancement over traditional lithium-ion batteries, addressing critical limitations in energy density and safety. While conventional lithium batteries approach theoretical energy density limits and suffer from thermal runaway due to flammable organic electrolytes, all-solid-state batteries utilize solid electrolytes to enable higher energy densities exceeding 500Wh/kg through compatibility with high-proportion silicon-based or lithium metal anodes. Among solid electrolyte types—polymer, oxide, sulfide, and halide—sulfide is considered the most promising mainstream route due to its superior ionic conductivity, despite challenges in electrochemical and air stability. The core technical hurdle is solid-solid interface wettability, which affects cycle life and lithium dendrite growth. Key innovations include dry electrode technology and isostatic pressing equipment to enhance interface contact. Industrialization is progressing with policy support, including approximately 6 billion yuan from China's Ministry of Industry and Information Technology in 2024. Commercialization is expected first in consumer electronics (2025-2026), followed by eVTOL (2026-2028), and mass production in the power sector after 2027, with large-scale deployment after 2030. Risks include technology progress and demand uncertainties.