| Cover | May 26, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 26, 2023 |
| Entity File Number | 001-40284 |
| Entity Registrant Name | Solid Power, Inc. |
| Entity Central Index Key | 0001844862 |
| Entity Tax Identification Number | 86-1888095 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 486 S. Pierce Avenue |
| Entity Address, Address Line Two | Suite E |
| Entity Address, City or Town | Louisville |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80027 |
| City Area Code | 303 |
| Local Phone Number | 219-0720 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | SLDP |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $11.50 |
| Trading Symbol | SLDPW |
| Security Exchange Name | NASDAQ |
