97588919v13 IN WITNESS WHEREOF, the Company’s duly authorized representative and the Participant have each executed this Agreement on the respective date below indicated. ARCADIUM LITHIUM PLC By: Title: Date: PARTICIPANT Signature: Date:

#97588919v13 NON-EMPLOYEE DIRECTOR GLOBAL RESTRICTED SHARE UNIT AWARD AGREEMENT UNDER THE ARCADIUM LITHIUM PLC OMNIBUS INCENTIVE PLAN ANNUAL EQUITY GRANT This GLOBAL RESTRICTED SHARE UNIT AWARD AGREEMENT, including any additional terms or conditions for the Participant’s country set forth in any appendix attached hereto (the “Appendix,” and collectively with this Non-Employee Director Global Restricted Share Unit Award Agreement, (this “Agreement”), is made by and between Arcadium Lithium plc (the “Company”) and [Participant Name] (the “Participant”). WHEREAS, the Company maintains the Arcadium Lithium plc Omnibus Incentive Plan (as it may be amended from time to time, the “Plan”); WHEREAS, the Company maintains the Arcadium Lithium plc Compensation Policy for Non-Employee Directors (as amended from time to time, the “Policy”), which contemplates the grant of awards to non-employee directors of the Board under the Plan; WHEREAS, Article 10 of the Plan authorizes the grant of Awards in the form of Restricted Share Units; WHEREAS, to further align the Participant’s personal financial interests with those of the Company’s shareholders, the Policy provides for the grant of Restricted Share Units to the Participant on the terms described herein, effective as of [Grant Date] (the “Grant Date”); and WHEREAS, the terms of the Plan are incorporated herein by reference and made a part of this Agreement and will control the rights and obligations of the Company and the Participant under this Agreement. In the event of a conflict among the provisions of the Plan, this Agreement and any descriptive materials provided in connection herewith, the provisions of the Plan will prevail. Unless otherwise provided in this Agreement, capitalized terms not otherwise defined herein will have the same meanings as in the Plan. NOW, THEREFORE, in consideration of the mutual covenants herein contained and other good and valuable consideration, receipt of which is hereby acknowledged, the parties hereto agree as follows: 1. Grant of Restricted Share Units. Pursuant to the Policy and the Plan, effective as of the Grant Date, the Company hereby grants to the Participant this Award of [Number of Shares Granted] Restricted Share Units on the terms and conditions set forth herein (the “Units”). Each Unit, once vested, represents an unfunded, unsecured right of the Participant to receive one ordinary share of the Company (each a “Share”) at a specified time. The Units will become vested, and the underlying Shares will be issued in respect of vested Units, as set forth in this Agreement. Exhibit 10.5

4 #97588919v13 of the transactions contemplated by this Agreement. The Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. (b) The Participant acknowledges that, regardless of any action taken by the Company or, if different, the Affiliate or Subsidiary to which the Participant provides service (the “Service Recipient”), the ultimate liability for any income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to a Participant’s participation in the Plan and legally applicable to the Participant (“Tax-Related Items”) is and remains the Participant’s responsibility and may exceed the amount actually withheld by the Company or the Service Recipient. The Participant further acknowledges that the Company and/or the Service Recipient (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the Units, including, but not limited to, the grant, vesting, or settlement of the Units, the subsequent sale of Shares acquired pursuant to such settlement and the receipt of any dividends or dividend equivalents and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the Units to reduce or eliminate the Participant’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Participant is subject to Tax-Related Items in more than one jurisdiction, the Participant acknowledges that the Company and/or the Service Recipient (or former service recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. (c) Prior to any relevant taxable or tax withholding event, as applicable, and as a condition to the Company’s obligation to issue Shares upon vesting of the Units hereunder, the Participant agrees to pay to the Company such amount as may be required to satisfy all applicable Tax-Related Items arising in connection with the Units (or otherwise make arrangements acceptable to the Company for the satisfaction any applicable withholding obligations with respect to all Tax-Related Items). If any applicable Tax-Related Items are not timely paid or satisfied, the Participant’s right to receive such Shares will be permanently forfeited. 9. Notices. (a) Any notice required to be given or delivered to the Company under the terms of this Agreement will be addressed to it in care of Secretary, Arcadium Lithium plc, 0000 Xxxxxx Xxxxxx, Xxxxx 0000, Xxxxxxxxxxxx, XX 00000 and any notice to the Participant will be addressed to the Participant’s address now on file with the Company, or to such other address as either may designate to the other in writing. Except as otherwise provided below in Section 9(b), any notice will be deemed to be duly given when enclosed in a properly sealed envelope addressed as stated above and deposited, postage paid, in a post office or branch post office regularly maintained by the United States government. (b) The Participant hereby authorizes the Company to deliver electronically any prospectuses or other documentation related to this Award, the Plan and any other compensation or benefit plan or arrangement in effect from time to time (including, without limitation, reports, proxy statements or other documents that are required to be delivered to participants in such plans or arrangements pursuant to federal or state laws, rules or regulations).

6 #97588919v13 the Company may amend or modify this Agreement without the Participant’s consent in accordance with the provisions of the Plan. 16. Governing Law and Venue. The interpretation, performance and enforcement of this Agreement shall be governed by the laws of the Bailiwick of Jersey. For purposes of any action, lawsuit or other proceedings brought to enforce this Agreement, relating to it, or arising from it, the parties hereby submit to and consent to the sole and exclusive jurisdiction of the state or federal courts in the Eastern District of Pennsylvania, and no other courts, where this grant of the Units is made and/or to be performed. 17. Privacy. By signing this Agreement, the Participant hereby acknowledges and agrees to the Company’s transfer of certain personal data of such Participant to the Company and its agents for purposes of implementing, performing or administering the Plan, this Award or any related benefit, as contemplated by Section 16.11 of the Plan. The Participant expressly gives his or her consent to the Company to process such personal data. 18. Discretionary Nature. The Participant acknowledges and agrees that the Plan and this Award are exceptional, voluntary, and discretionary and do not create any contractual or another right to receive future grants of award, or benefits in lieu of awards, even if awards have been granted in the past. The Participant further acknowledges that any future awards will be made in the Committee’s discretion, and that the Plan may be terminated, amended or canceled by the Company at any time in accordance with its terms. 19. Section Headings. The headings of sections and paragraphs of this Agreement are inserted for convenience only and shall not in any way affect the meaning or construction of any provision of this Agreement.

#97588919v13 IN WITNESS WHEREOF, the Company’s duly authorized representative and the Participant have each executed this Agreement on the respective date below indicated. ARCADIUM LITHIUM PLC By: Title: Date: PARTICIPANT Signature: Date:

9 #97588919v13 APPENDIX TO NON-EMPLOYEE DIRECTOR GLOBAL RESTRICTED SHARE UNIT AWARD AGREEMENT UNDER THE ARCADIUM LITHIUM PLC OMNIBUS INCENTIVE PLAN ANNUAL EQUITY GRANT Certain capitalized terms used but not defined in this Appendix have the meanings set forth in the Plan and/or in the Global Non-Employee Director Global Restricted Share Unit Award Agreement. Terms and Conditions This Appendix includes additional terms and conditions that govern the Units granted to the Participant under the Plan if the Participant resides and/or works in one of the countries listed below. If the Participant is a citizen or resident (or is considered as such for local law purposes) of a country other than the country in which the Participant is currently residing and/or working, or if the Participant relocates to another country after the grant of the Units, the Company shall, in its discretion, determine to what extent the terms and conditions contained herein shall be applicable to the Participant. Notifications This Appendix may also include information regarding securities laws, exchange controls, and certain other issues of which Participant should be aware with respect to participation in the Plan. The information is based on the securities, exchange control, and other laws in effect in the respective countries as of December 2023. Such laws are often complex and change frequently. As a result, the Participant should not rely on the information in this Appendix as the only source of information relating to the consequences of the Participant’s participation in the Plan because the information may be out of date at the time the Units vest or the Participant sells Shares acquired under the Plan. In addition, the information contained herein is general in nature and may not apply to the Participant’s particular situation, and the Company is not in a position to assure the Participant of a particular result. Accordingly, the Participant is advised to seek appropriate professional advice as to how the relevant laws in the Participant’s country may apply to Participant’s situation. Finally, if the Participant is a citizen or resident (or is considered as such for local law purposes) of a country other than the country in which the Participant is currently residing and/or working, or if the Participant relocates to another country after the grant of the Units, the notifications contained herein may not be applicable to the Participant in the same manner.

10 #97588919v13 ALL COUNTRIES Terms and Conditions Nature of Award. In accepting the Units, the Participant acknowledges and agrees that: 1. The Participant is voluntarily participating in the Plan. 2. The Units and any Shares acquired under the Plan, and the income from and value of same, are an extraordinary item that do not constitute compensation of any kind for service of any kind rendered to the Company or any Affiliate or Subsidiary, and which are outside the scope of the Participant’s Service agreement, if any. 3. The Units and any Shares acquired under the Plan, and the income from and value of same, are not part of normal or expected compensation or salary for any purpose, including, but not limited to, calculating any severance, resignation, termination, redundancy, end-of- service payments, bonuses, long-service options, pension, holiday pay, retirement benefits, or similar payments. 4. Unless otherwise agreed with the Company in writing, the Units and the Shares subject to the Units, and the income from and value of same, are not granted as consideration for, or in connection with, the service the Participant may provide as a director of an Affiliate or Subsidiary; 5. The future value of the underlying Shares is unknown, indeterminable and cannot be predicted with certainty. 6. No claim or entitlement to compensation or damages arises from termination of the Units or diminution in value of the Shares subject to the Units and the Participant irrevocably releases the Company and any Affiliates or Subsidiaries from any such claim that may arise. If, notwithstanding the foregoing, any such claim is found by a court of competent jurisdiction to have arisen then, by signing this Agreement, the Participant shall be deemed irrevocably to have waived the Participant’s entitlement to pursue such a claim. 7. No claim or entitlement to compensation or damages shall arise from forfeiture of the Units resulting from the Participant’s Separation from Service (for any reason whatsoever, whether or not later found to be invalid or in breach of employment laws in the jurisdiction where the Participant is providing Service or the terms of the Participant’s Service agreement, if any). 8. Neither Company nor its Affiliates and Subsidiaries shall be liable for any foreign exchange rate fluctuation between the Participant’s local currency and the United States Dollar that may affect the value of the Units, the calculation of any applicable Tax-Related Items, or of any amounts due to the Participant pursuant to the vesting of the Units or the subsequent sale of the Shares acquired pursuant to the Units.

13 #97588919v13 Service agreement, if any. The Participant will not earn or be entitled to any pro-rated vesting for that portion of time before the date on which the Participant’s right to vest (if any) terminates, nor will Participant be entitled to any compensation for lost vesting. Notwithstanding the foregoing, if applicable employment standards legislation explicitly requires continued entitlement to vesting during a statutory notice period, the Participant’s right to vest in the Units under the Plan, if any, will terminate effective as of the last day of the Participant’s minimum statutory notice period, but the Participant will not earn or be entitled to pro-rated vesting if any applicable vesting date falls after the end of the Participant’s statutory notice period, nor will the Participant be entitled to any compensation for lost vesting. Tax Treatment and Withholding. The following provision replaces Section 8(c) of the Agreement: Prior to any relevant taxable or tax withholding event, as applicable, and as a condition to the Company’s obligation to issue Shares upon vesting of the Units hereunder, the Participant agrees to pay to the Company such amount as may be required to satisfy all applicable Tax-Related Items arising in connection with the Units (or otherwise make arrangements acceptable to the Company for the satisfaction any applicable withholding obligations with respect to all Tax-Related Items). In this regard, the Participant shall have the right to choose a method of withholding from one or a combination of the methods authorized by the Company, in the absence of any such election, authorizes the Company and/or the Service Recipient, at their discretion, to satisfy any applicable withholding obligations with respect to all Tax-Related Items through the Company’s default method at such time. The following terms and conditions apply to Service Providers resident in Quebec: French Language Documents. A French translation of this Agreement and certain other documents related to the Units will be made available to the Participant as soon as reasonably practicable. The Participant understands that, from time to time, additional information related to the Units may be provided in English and such information may not be immediately available in French. However, upon request, the Company will provide a translation of such information into French as soon as reasonably practicable. Notwithstanding anything to the contrary in this Agreement, and unless the Participant indicates otherwise, the French translation of this Agreement and certain other documents will govern the Participant’s participation in the Plan. Notifications Securities Law Information. The Participant is permitted to sell Shares acquired through the Plan through the designated broker appointed by the Company, provided the resale of Shares acquired under the Plan takes place outside of Canada, including, if applicable, through the facilities of a stock exchange on which the Shares are listed. The Shares are currently listed on the New York Stock Exchange.