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SK On Opens Daejeon All-Solid-State Battery Pilot Plant, Accelerates Commercialization to 2029

The facility will validate ASSB prototypes using Warm Isostatic Press technology to boost cell density toward an initial 800 Wh/L target.

Overview

  • SK On held a completion ceremony at its Future Technology Institute in Daejeon for a roughly 4,600–4,628 sq. m pilot line attended by CEO Lee Seok-hee and Solid Power Korea’s Andrea Maier.
  • The new line will build prototypes for client evaluations and verify quality and performance before moving to full-scale manufacturing.
  • R&D will focus on sulfide-based solid-state cells, with a dedicated section for lithium-metal battery development.
  • The company introduced Warm Isostatic Press in Korea for the first time and paired it with conventional pressing to address productivity constraints.
  • Optimized mixing, improved electrode–electrolyte bonding, and refined press conditions reduced internal and interfacial resistance, supporting more stable charging, longer cycle life, and a long-term energy-density goal of 1,000 Wh/L.