Exhibit 16.1

March 12, 2025

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read Item 4.01 of Form 8-K, dated March 12, 2025, of Solid Power, Inc. and are in agreement with the statements contained in the first through fourth paragraphs on page 2 therein. We have no basis to agree or disagree with other statements of the registrant contained therein.

/s/ Ernst & Young LLP