Standard Lithium Demonstrates Successful Use of South West Arkansas Lithium Carbonate in North American LFP Battery Cells

VANCOUVER, British Columbia, Aug. 13, 2026 (GLOBE NEWSWIRE) — Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV: SLI) (NYSE.A: SLI), a leading near-commercial lithium company, is pleased to announce the successful downstream battery testing of lithium carbonate produced from its South West Arkansas project (the “SWA Project”).

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Standard Lithium provided approximately one kilogram of battery-quality lithium carbonate produced using the SWA Project’s brine and process flowsheet (see press release dated 11 March 2025 ) to Nano One® Materials Corp. (“Nano One”). Nano One successfully used that material in its patented One-Pot™ process to produce LFP CAM, followed by battery coin cells for testing.

The resulting material demonstrated desired chemical and physical properties, achieved the intended particle morphology and delivered approximately 155 mAh/g on first discharge in initial electrochemical testing.

Dr. Andy Robinson, President and Chief Operating Officer of Standard Lithium, commented: “We have spent years testing and developing an integrated process flowsheet designed to produce a high-quality lithium product to meet the stringent needs of the battery industry. Our recent work alongside Nano One provides some exciting additional real-world validation of the work we have done.”

“We also understand that building a secure domestic battery and energy storage supply chain requires more than just lithium production in the United States. There remains a significant gap between domestic demand needs and the planned production of critical battery raw materials and components, like CAM, to support it. Standard Lithium is well positioned to be a champion in the development of a complete supply chain, including by working with innovative companies such as Nano One that can help provide a solution for the missing midstream in the U.S.”

The test work completed is part of Standard Lithium’s broader efforts to support technology development opportunities and to engage with novel companies across the value chain. These collaborations enhance the Company’s understanding of evolving customer requirements and support the development of a more resilient and competitive domestic battery industry.

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 labor, 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 and purification process. The Company’s flagship projects are in the Smackover Formation, an attractive lithium brine asset, focused in Arkansas and Texas.