Dr. Andy Robinson reports

NEW AND NOVEL LOW TEMPERATURE IP-PROTECTED METHOD FOR PRODUCING LITHIUM sulphide DEVELOPED IN PARTNERSHIP BETWEEN STANDARD LITHIUM AND TELESCOPE INNOVATIONS

Standard Lithium Ltd. has successfully produced battery-quality lithium sulphide as part of a collaboration with Telescope Innovations.

As previously mentioned (see Aug 28, 2024, news release), Standard Lithium has been working with its research and development partner, Telescope Innovations, to develop new and novel conversion technologies to make next-generation battery materials. This new conversion process has now been successfully used to convert lithium hydroxide produced by Standard Lithium at its southern Arkansas demonstration plant into battery-quality lithium sulphide (Li2S -- see news release dated May 7, 2025). Samples of the lithium sulphide have been shipped to solid-state-battery companies in Asia and North America for testing and validation purposes.

Standard Lithium's president and chief operating officer, Dr. Andy Robinson, commented: "This development of new IP and technology with our research partner, Telescope Innovations, exemplifies our approach to becoming the leading new lithium company in North America. Whilst our principle area of focus, and capital allocation, is building the first DLE project in North America at our South West Arkansas project phase 1 with our joint venture partner Equinor, we understand that constant technological evolution is integral to staying at the forefront of this rapidly evolving industry. This recent work led by Telescope demonstrates that we are able to take lithium chemicals produced from the Smackover formation in southern Arkansas, and then transform them into the feedstocks required by the next generation of batteries. Our partnership with Telescope Innovations continues to be a win-win for our shareholders and theirs."

Lithium sulphide is a key raw material required for many next-generation solid-state battery chemistries (see news release: Toyota works with partners to develop Li2S based batteries), but despite the importance of lithium sulphide in the next generation of battery technology, it is only produced commercially in very small quantities and at very high cost. The technical collaboration between the two teams has resulted in a novel low-temperature patented process that has the following advantages:

• Feedstock flexibility -- both lithium hydroxide and lithium carbonate are viable inputs;

• Impurity tolerance -- allows the use of technical-grade feedstocks;

• Lower processing temperatures (less than 100 C) -- reduces equipment complexity and operating costs;

• Enhanced safety in manufacturing -- avoids high-temperature conditions and associated thermal risks.

About Standard Lithium Ltd.

Standard Lithium is a leading near-commercial lithium development company focused on the sustainable development of a portfolio of large, high-grade lithium-brine properties in the United States. The company prioritizes projects characterized by high-grade resources, robust infrastructure, skilled labour and streamlined permitting. Standard Lithium aims to achieve sustainable, commercial-scale lithium production via the application of a scalable and fully integrated direct lithium extraction (DLE) and purification process. The company's flagship projects are located in the Smackover formation, a world-class lithium brine asset, focused in Arkansas and Texas. In partnership with global energy leader Equinor, Standard Lithium is advancing the SWA project, a greenfield project located in southern Arkansas, and actively exploring promising lithium brine prospects in eastern Texas. Standard Lithium also holds an interest in mineral leases in the Mojave Desert in San Bernardino county in California.

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