Solid Power Confirms South Korea Sulfide Solid Electrolyte JV, Targeting 500 Tons by 2028 with Expansion to 20,000 Tons/Year

September 20, 2026

Shanghai Metals Market (SMM) News China

Overview

Solid Power has confirmed plans to establish a sulfide solid electrolyte joint venture in South Korea, targeting an initial capacity of 500 tons by 2028 with a long-term goal of up to 20,000 tons/year. Concurrently, Factorial Energy is partnering with Mitsui Kinzoku for mass production of argyrodite-type sulfide solid electrolytes in Japan, and Panasonic Energy will begin sample delivery of its 150°C-operable solid-state battery by Q4. This marks an intensified push for solid-state battery material development and production scaling among key industry players.

In Depth

Key Findings

The solid-state battery industry is witnessing an accelerated pace of technological iteration and production scaling. Solid Power has confirmed its plans to establish a sulfide solid electrolyte joint venture in South Korea, aiming for an initial production capacity of 500 tons per year by 2028, with an ambitious target to expand to 20,000 tons/year thereafter. This development is part of a broader trend, as Factorial Energy collaborates with Mitsui Kinzoku for mass production of argyrodite-type sulfide solid electrolytes in Japan, and Panasonic Energy prepares to begin sample delivery of its 150°C-operable solid-state battery by the end of the year.

Technical / Clinical Details

Solid Power’s South Korea JV: Solid Power, a leader in sulfide solid electrolyte technology, is making a strategic move to scale its manufacturing capabilities. Sulfide-based electrolytes are critical for solid-state batteries due to their high ionic conductivity and potential for significantly enhanced safety and energy density compared to conventional liquid electrolytes in lithium-ion batteries.
Factorial Energy and Mitsui Kinzoku Partnership: The collaboration aims to mass-produce argyrodite-type sulfide solid electrolytes, known for their superior ionic conductivity and electrochemical stability. This partnership is crucial for securing a stable supply of this key material and achieving cost competitiveness.
Panasonic Energy’s 150°C Solid-State Battery: The capability to operate stably at 150°C is a significant breakthrough, potentially revolutionizing applications in industrial machinery and other harsh environments where thermal stability is paramount. The initiation of sample delivery is a major milestone towards practical deployment.
Chinese Manufacturers’ Expansion: Companies like Langu New Energy and Easpring in China are also aggressively expanding their capacities for solid electrolytes and anode materials, indicating a rapidly intensifying global competition in the solid-state battery sector.

Background & Context

The proliferation of electric vehicles (EVs) and energy storage systems (ESS) has created an urgent demand for safer, higher-performance, and longer-lasting battery technologies. Solid-state batteries, with their reduced fire risk and higher energy density potential, are widely considered the holy grail of next-generation batteries. Driven by government policy support and market demand, the localization and diversification of material supply chains, along with the transition to large-scale production, are critical challenges. These recent announcements represent substantial progress towards the commercialization of solid-state batteries within this dynamic landscape.

Strategic Significance & Outlook

The collective actions by Solid Power, Factorial Energy, Panasonic Energy, and other leading players signal a clear acceleration towards the mass production and practical application of solid-state batteries. The expansion of sulfide solid electrolyte production capacity, in particular, will be instrumental in stabilizing supply chains and driving down costs, thereby accelerating the market introduction of EVs equipped with solid-state batteries. In the coming years, solid-state battery technology is expected to mature further, leading to innovative applications across a wide range of sectors, from industrial machinery and consumer electronics to broader mobility solutions. Companies that successfully pursue both technological innovation and economies of scale will be poised to lead this evolving market.

Source: https://news.metal.com/newscontent/104122948-solid-state-battery-weekly–%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8Bindustry-deepens-technologyiteration-amid-ebb-and-flow-policy-push-intensifies

Get our weekly technology intelligence — free

Receive an infographic that lets you judge at a glance whether each field’s analysis report is worth reading.

Subscribe Free — Weekly Tech Intelligence

By subscribing, you’ll receive Troy-Technical’s weekly technology intelligence newsletter.