v3.26.1
Cover
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Entity File Number 001-40569
Entity Registrant Name Standard Lithium Ltd.
Entity Incorporation, State or Country Code Z4
Entity Primary SIC Number 2800
Entity Tax Identification Number 00-0000000
Entity Address, Address Line One Suite 1625, 1075 West Georgia Street
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Country CA
Entity Address, Postal Zip Code V6E 3C9
City Area Code 604
Local Phone Number 409‑8154
Title of 12(b) Security Common Shares
Trading Symbol SLI
Security Exchange Name NYSEAMER
Annual Information Form true
Audited Annual Financial Statements true
Document Financial Statement Error Correction [Flag] false
Entity Common Stock, Shares Outstanding 239,705,571
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
ICFR Auditor Attestation Flag false
Entity Central Index Key 0001537137
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Amendment Flag false
Transition Report true
Auditor Name PricewaterhouseCoopers LLP
Auditor Firm ID 271
Auditor Location Vancouver, British Columbia, Canada
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of financial position of Standard Lithium Ltd. and its subsidiaries (the Company) as of December 31, 2025, 2024 and June 30, 2024, and the related consolidated statements of comprehensive (loss) income, of changes in equity and of cash flows for the year ended December 31, 2025, for the six-month fiscal period ended December 31, 2024, and for the year ended June 30, 2024, including the related notes (collectively referred to as the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, 2024 and June 30, 2024, and its financial performance and its cash flows for the year ended December 31, 2025, for the six-month fiscal period ended December 31, 2024, and for the year ended June 30, 2024 in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name CT Corporation System
Entity Address, Address Line One 1015 15th Street N.W., Suite 1000
Entity Address, City or Town Washington
Entity Address, State or Province DC
Entity Address, Postal Zip Code 20005
City Area Code 202
Local Phone Number 572‑3133