v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 05, 2025
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Securities Act File Number 001-40284  
Entity Registrant Name SOLID POWER, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 86-1888095  
Entity Address, Address Line One 486 S. Pierce Ave., 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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   181,284,380
Entity Central Index Key 0001844862  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common stock    
Title of 12(b) Security Common stock, par value $0.0001 per share  
Trading Symbol SLDP  
Security Exchange Name NASDAQ  
Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $11.50    
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