Standard Lithium Provides Processing and Pilot Plant Update

STANDARD LITHIUM PROVIDES PROCESSING AND PILOT PLANT UPDATE

12th September 2018 – Vancouver, BC – Standard Lithium Ltd.(“Standard Lithium” or the

“Company”) (TSXV: SLL) (OTCQX: STLHF) (FRA: S5L), is pleased to provide an update

regarding the Company’s rapid progress in developing and building a large-scale Pilot Plant for

deployment at the Arkansas project site. The Company and its Scientific Advisory Team have

been developing, testing and optimising proprietary lithium extraction and crystallisation

technologies on Smackover brines for over a year, and are now at the stage where the process

flowsheet is sufficiently tested and proven to allow procurement and fabrication to commence on

the full-scale Pilot Plant.

A lithium extraction Mini-Pilot Plant has been operated continuously for long durations, and has

demonstrated that lithium can be selectively extracted from raw Smackover brine (i.e. with no

pre-treatment other than pH adjustment); can be converted into a concentrated and

substantially purified (compared to the feed brine) lithium chloride solution; that the lithium-

loaded sorbent material can be continuously regenerated and recycled to the extraction stage;

and that overall lithium extraction efficiencies of over 90% can be achieved. Completion of this

work has allowed design of the large-scale lithium extraction Pilot Plant to be sufficiently

completed, such that procurement of long lead-time equipment has commenced. The

procurement and fabrication of the lithium extraction Pilot Plant is being performed by Zeton Inc.

at their design and fabrication facility in Burlington, Ontario. Once fabrication of the modular

Pilot Plant is complete, it will be shipped to the Project site in southern Arkansas for installation,

commissioning and operation. Initial site investigation and civil/mechanical engineering design

work have commenced at the Project site, and it is expected that all site preparation and

brine/utility interconnections will be completed well in advance of deployment of the Pilot Plant

modules to the Project site.

In addition, the Company has been performing testwork to selectively crystallise ‘battery-grade’

lithium carbonate directly from the concentrated lithium chloride solutions produced by the

Company’s proprietary lithium extraction technology. This testwork has been successful in

making high purity lithium carbonate material (>99.5% purity), and as previously announced

(see Standard Lithium news release 06 th June 2018), the Company and its technology partners

are currently fabricating a Pilot scale crystallisation plant. This first Pilot scale plant will be

capable of running continuously, and will serve as proof-of-concept that Standard Lithium’s

proprietary crystallisation technology can be used in place of existing OEM crystallisation

technologies. Should initial testing be successful, then a larger Pilot/Demo scale crystalliser will

be constructed for deployment at the Project site.

Dr. Andy Robinson, President and COO of Standard Lithium commented, “ our Scientific

Advisory Team and technology partners have been working tirelessly over the past 12 months

to develop modern, efficient and scaleable technology solutions appropriate for deployment at

our Project site in Arkansas. We’re very excited that we’re now at the stage where procurement

and construction of the full-scale Pilot equipment has commenced, and all project activities are

aligned towards deploying the full-scale modular Pilot plant in the first part of 2019. Standard

Lithium has some significant milestones ahead of us in the next two quarters, and we look

forward to sharing more details on our projects and proprietary process technologies as we

issue technical reports over the coming months.”

Quality Assurance

Dr. Ron Molnar, Professional Metallurgical Engineer (Ontario P.E.# 100111288) and Ross

Lewis, Professional Engineer (APEGBC#116613), are qualified persons as defined by NI 43-

101, and have reviewed and approved the relevant scientific and technical information that

forms the basis for this news release. Dr. Molnar and Mr. Lewis are independent of the

Company.

About Standard Lithium Ltd.

The Company’s flagship project is located in southern Arkansas, where it is engaged in the

testing and proving of the commercial viability of lithium extraction from over 150,000 acres of

permitted brine operations utilising the Company’s proprietary selective extraction technology.

The Company is also pursuing the resource development of over 30,000 acres of separate brine

leases located in southwestern Arkansas and approximately 45,000 acres of mineral leases

located in the Mojave Desert in San Bernardino County, California.

Standard Lithium is listed on the TSX Venture under the trading symbol “SLL”; quoted on the

OTCQX under the symbol “STLHF”; and on the Frankfurt Stock Exchange under the symbol

“S5L”. Please visit the Company’s website atwww.standardlithium.com.

For further information, contact Anthony Alvaro at (604) 240 4793

On behalf of the Board,

Standard Lithium Ltd.

Robert Mintak, CEO & Director

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of

the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. This

news release may contain certain “Forward-Looking Statements” within the meaning of the United States

Private Securities Litigation Reform Act of 1995 and applicable Canadian securities laws. When used in

this news release, the words “anticipate”, “believe”, “estimate”, “expect”, “target, “plan”, “forecast”, “may”,

“schedule” and other similar words or expressions identify forward-looking statements or information.

These forward-looking statements or information may relate to future prices of commodities, accuracy of

mineral or resource exploration activity, reserves or resources, regulatory or government requirements or

approvals, the reliability of third party information, continued access to mineral properties or infrastructure,

fluctuations in the market for lithium and its derivatives, changes in exploration costs and government

regulation in Canada and the United States, and other factors or information. Such statements represent

the Company’s current views with respect to future events and are necessarily based upon a number of

assumptions and estimates that, while considered reasonable by the Company, are inherently subject to

significant business, economic, competitive, political and social risks, contingencies and uncertainties.

Many factors, both known and unknown, could cause results, performance or achievements to be

materially different from the results, performance or achievements that are or may be expressed or

implied by such forward-looking statements. The Company does not intend, and does not assume any

obligation, to update these forward-looking statements or information to reflect changes in assumptions or

changes in circumstances or any other events affections such statements and information other than as

required by applicable laws, rules and regulations.