6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

For the month of December, 2025

NOVONIX LIMITED

(Translation of registrant’s name into English)

Level 38

71 Eagle Street

Brisbane, QLD 4000 Australia

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20‑F or Form 40‑F.

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: December 15, 2025

EX-99.1

Appointment of Mike O’Kronley to the Board of Directors

Chattanooga, TN (USA), 15 December 2025 - NOVONIX Limited (NASDAQ: NVX, ASX: NVX) (“NOVONIX” or the “Company”), a leading battery materials and technology company, announced today that its Chief Executive Officer, Mike O’Kronley, has been appointed as Managing Director of the Company, effective 15 December 2025.

Mike O’Kronley has served as Chief Executive Officer since 19 May 2025. The NOVONIX Board of Directors believes this appointment will further strengthen Board oversight and alignment between the Company’s strategic execution and governance framework.

The material terms of O’Kronley’s employment as Chief Executive Officer of NOVONIX remain unchanged.

This announcement has been authorised for release by Ron Edmonds, Chairman.

About NOVONIX NOVONIX strives to reduce supply chain risk, support U.S. energy independence, and establish a resilient battery materials supply chain. The company is building a North American platform for critical battery materials—anchored by its Chattanooga, Tennessee headquarters and anode materials operations, expanding through its patented all-dry, precursor-free cathode synthesis technology, and supported by industry-leading battery cell testing and R&D services.

Together, these capabilities position NOVONIX as an integrated supplier of advanced battery materials and technologies powering the energy storage and electrification economy.

To learn more, visit us at www.novonixgroup.com or on LinkedIn and X.

For NOVONIX Limited Investors: ir@novonixgroup.com Media: media@novonixgroup.com

1029 West 19th Street; Chattanooga, TN 37408; USA | novonixgroup.com

Cautionary Note Regarding Forward-Looking Statements This communication contains forward-looking statements about the Company and the industry in which we operate. Forward-looking statements can generally be identified by use of words such as “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will,” or “would,” or other similar expressions. Examples of forward-looking statements in this communication include, among others, statements we make regarding the Board’s belief that Mr. O’Kronley’s appointment will strengthen Board oversight and alignment between the Company’s strategic execution and governance framework .

We have based such statements on our current expectations and projections about future events and trends that we believe may affect our financial condition, results of operations, business strategy and financial needs. Such forward-looking statements involve and are subject to known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. These and other factors that could affect our business and results are included in our filings with the U.S. Securities and Exchange Commission (“SEC”), including the Company’s most recent annual report on Form 20-F. Copies of these filings may be obtained by visiting our Investor Relations website at www.novonixgroup.com or the SEC’s website at www.sec.gov.

Forward-looking statements are not guarantees of future performance or outcomes, and actual performance and outcomes may differ materially from those made in or suggested by the forward-looking statements contained in this communication. Accordingly, you should not place undue reliance on forward-looking statements. Any forward-looking statement in this communication is based only on information currently available to us and speaks only as of the date on which it is made. We undertake no obligation to update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise, except as required by law.

1029 West 19th Street; Chattanooga, TN 37408; USA | novonixgroup.com