Idemitsu Kosan : Completed construction to increase capacity of Plant 1,small pilot facilities for mass production of solid electrolytes
Published on 04/22/2025 at 04:09,
updated on 04/22/2025 at 04:11
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April 21, 2025
Press Release
Company Name: Idemitsu Kosan Co.,Ltd.
Representative Director & President: Noriaki Sakai
(Company Code: 5019, TSE Prime Market)
Contact person: Daisuke Mogi, General Manager,
Investor Relations Office, Finance & Accounting Department (TEL: +81-3-3213-9307)
Completed construction to increase capacity of Plant 1,
small pilot facilities for mass production of solid electrolytes
(all-solid-state battery materials)
Expanding production capacity to more than a dozen tons and accelerating development of mass production technology to contribute to the widespread use of all-solid-state batteries
Idemitsu Kosan Co.,Ltd. (Headquarters: Chiyoda-ku, Tokyo; Representative Director, President: Noriaki Sakai, hereinafter referred to as "Idemitsu") has completed construction to increase the capacity of its Plant 1 (located on the premises of Idemitsu's Chiba Complex in Ichihara City, Chiba Prefecture), a small pilot facilities for the mass production of solid electrolytes used in all-solid-state lithium-ion rechargeable batteries (hereinafter referred to as "all-solid-state batteries"), and a completion ceremony was held on April 18, 2025.
With this capacity increase, we have expanded our solid electrolyte sample supply capacity from several tons per year to more than a dozen tons per year. We also have facilities for mass production technology development. Idemitsu will accelerate technological verification to establish mass production technology in a large pilot facility as the next stage, aiming for practical application of all-solid-state batteries in 2027 to 2028, and beyond that, commercialization of solid electrolytes.
Appearance of Plant 1
Completion ceremony
Idemitsu
is
developing solid electrolytes, an essential material for all-solid-state batteries, which contribute to the evolution of
electric vehicles (EVs) and the creation of a resource-recycling society, as well as building a mass production system. Two small pilot facilities are currently in operation, of which the capacity increase work started in FY2023 at the Plant 1 has been completed.
With this capacity increase, we have increased our capacity to supply samples of solid electrolytes from several tons to more than a dozen tons per year, and we have also expanded our facilities to verify mass production technology for the future. We will accelerate the development of mass production technology for solid electrolytes, which will lead to the next stage of establishing mass production technology in a large pilot facility.
The basic design of the pilot facility was started in October 2024. And as with Plant 1, it is scheduled to be constructed within the Chiba Complex. In February 2025, we also announced our decision to construct a large-scale production facility for lithium sulfide (Li2S, an important intermediate raw material for solid electrolytes.
We will accelerate the development of solid electrolyte performance improvement and mass production technology, and steadily build an integrated value chain from raw materials to finished products, aiming to contribute to the social implementation of all-solid-state batteries, which are considered to be the mainstay of next-generation batteries.
[Project Roadmap]
[Reference]
Press Release: Idemitsu has decided to construct a large-scale production facility for lithium sulfide, an intermediate raw material for the mass production of all-solid-state battery materials (solid electrolytes) (February 27, 2025)
Press release: Basic Design of Large Pilot Facility Begins for Commercialization of solid electrolytes for All-Solid- State Batteries (October 28, 2024)
Press Release: Decision made to increase supply capacity of solid electrolytes for next-generation batteries (all-solid lithium battery) (June 19, 2023)
Idemitsu Kosan Co. Ltd. published this content on April 22, 2025, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on April 22, 2025 at 08:09 UTC.
Idemitsu Kosan Co Ltd is Japan-based company primarily engaged in fossil fuel-related businesses. The Company operates five business segments. The Fuel Oil segment is engaged in the production, sales, import & export, and trading of refined petroleum products. The Basic Chemicals Segment is engaged in the production and sale of olefins and aromatics products. The High Functional Materials segment is engaged in lubricants, functional chemicals, electronic materials, functional pavement materials, and agribio products. The Power & Renewable Energy segment is engaged in power generation (includes thermal, solar, wind), power sales, and solar cell operations. The Resources segment is engaged in exploration, development, production, and sales of energy resources such as crude oil, natural gas, and coal. The Company also conducts insurance and intra-group service businesses.
