Solid Power Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(RULE 14a-101)

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material Pursuant to §240.14a-12

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SOLID POWER, INC.

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(Name of Registrant as Specified In Its Charter)​

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(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)​

Payment of Filing Fee (Check the appropriate box):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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LETTER TO STOCKHOLDERS

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April 10, 2025

DEAR STOCKHOLDER:

It is a pleasure for us to extend to you an invitation to attend the 2025 Annual Meeting of Stockholders of Solid Power, Inc. (the “Annual Meeting”). The Annual Meeting will be held virtually on May 21, 2025, at 10:00 a.m., Mountain Time. You may attend the Annual Meeting, submit questions, and vote your shares electronically during the Annual Meeting via live webcast by visiting https://www.cstproxy.com/solidpower/2025.

The Notice of 2025 Annual Meeting of Stockholders and this proxy statement describe the proposals to be considered and voted upon at the Annual Meeting.

We hope that all stockholders will virtually attend the Annual Meeting. Whether or not you plan to attend the Annual Meeting, it is important that you be represented. To ensure that your vote will be received and counted, please vote online or by mail by following the instructions included on your Notice of Internet Availability of Proxy Materials, included on your proxy card or voting instruction form, or that otherwise accompany your proxy materials.

On behalf of our Board of Directors, we would like to express our appreciation for your support and interest in Solid Power, Inc. We look forward to seeing you at the Annual Meeting.

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NOTICE OF 2025 ANNUAL MEETING OF STOCKHOLDERS

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TO THE STOCKHOLDERS OF SOLID POWER, INC.:

The 2025 Annual Meeting of Stockholders of Solid Power, Inc. (“Solid Power,” “we,” “us,” “our,” or the “Company”) will be held on May 21, 2025, at 10:00 a.m., Mountain Time. We have adopted a virtual format for the 2025 Annual Meeting of Stockholders (the “Annual Meeting”) to provide a safe, consistent, and convenient experience to all stockholders regardless of location. You may attend the Annual Meeting, submit questions, and vote your shares electronically during the Annual Meeting via live webcast by visiting https://www.cstproxy.com/solidpower/2025.

The Annual Meeting is being held for the following purposes:

To elect as Class I directors the four nominees named in the proxy statement and recommended by our Board of Directors.

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To ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025.

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To approve, by a non-binding advisory vote, the compensation of our named executive officers.

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To consider and act upon any other business that may properly come before the Annual Meeting or any adjournment or postponement of the Annual Meeting.

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You may vote on these matters online at the Annual Meeting or by proxy. Whether or not you plan to virtually attend the Annual Meeting, we ask that you vote by one of the following methods to ensure that your shares will be represented at the meeting in accordance with your wishes:

• Vote online by following the instructions included on your Notice of Internet Availability of Proxy Materials, included on your proxy card or voting instruction form, or that otherwise accompany your proxy materials; or

• Vote by mail by completing and returning your proxy card or voting instruction form in the addressed stamped envelope provided, if you received a paper copy of the proxy materials.

Only stockholders of record at the close of business on March 24, 2025 are entitled to notice of,

and to vote at, the Annual Meeting or any adjournment or postponement of the meeting.

The proxy materials were either made available to you online or

mailed to you beginning on or about April 10, 2025.

By Order of the Board of Directors

James Liebscher

Chief Legal Officer and Secretary

April 10, 2025