Idemitsu Kosan Co., Ltd. (Idemitsu) and Toyota Motor Corporation (Toyota) have joined forces in a groundbreaking partnership to advance the development of mass production technology for solid electrolytes. Their collective efforts are geared towards enhancing productivity and establishing a robust supply chain for the mass production of all-solid-state batteries, a pivotal component for battery electric vehicles (BEVs). This collaboration represents a significant step in the journey towards achieving carbon neutrality and the widespread adoption of electric vehicles.

Pioneers in Battery Technology

Both Idemitsu and Toyota have a rich history of leadership in various fields, including material development related to all-solid-state batteries. Idemitsu has been actively engaged in research and development of elemental technologies for all-solid-state batteries since 2001, while Toyota embarked on a similar journey in 2006. Their shared expertise and commitment make them formidable partners in this ambitious venture.

Sulfide Solid Electrolytes: A Game-Changer

The collaboration between Idemitsu and Toyota focuses on sulfide solid electrolytes, a material with immense potential for achieving high capacity and output in BEVs. Sulfide solid electrolytes are prized for their softness and adhesive properties, which are vital for efficient and cost-effective battery mass production.

Phases of Collaboration

This collaboration unfolds in several distinct phases, each crucial for achieving the ultimate goal of mass-producing all-solid-state batteries.

Phase 1: Development and Pilot Testing

The first phase involves the development of sulfide solid electrolytes and preparation for a large pilot facility. Both companies will draw on their technical expertise to create high-quality sulfide solid electrolytes that meet rigorous standards for quality, cost, and lead times. These efforts will culminate in the demonstration of mass production using Idemitsu's pilot facility.

Phase 2: Mass Production

In the second phase, a large pilot facility will be constructed and initiated. Idemitsu will lead the charge in manufacturing sulfide solid electrolytes, while Toyota will simultaneously work on developing all-solid-state batteries that incorporate these electrolytes. This phase aims to ensure the market launch of BEVs equipped with all-solid-state batteries by 2027-28.

Phase 3: Planning for Full-Scale Mass Production

The final phase hinges on the results of Phase 2, where both companies will strategize the future of full-scale mass production and commercialization. This planning stage is pivotal in ensuring a smooth transition to widespread production of all-solid-state batteries.

Sustainable Supply Chain

Idemitsu has been diligently developing production technologies for lithium sulfide, an intermediate material crucial in solid electrolyte production. By utilizing by-products generated during petroleum refining, the company aims to establish a stable supply system. Additionally, Idemitsu is expanding the capacity of its pilot facilities, taking significant steps toward realizing commercial all-solid-state batteries by 2027-28.

A Vision of a Sustainable Future

The collaboration between Idemitsu and Toyota is set to revolutionize the BEV industry by combining their material development and manufacturing expertise with Toyota's battery processing and assembly capabilities. Together, they aim to make all-solid-state batteries a global reality, contributing significantly to the pursuit of global carbon neutrality.