| Investor Name | Invest Money | Lead Investor | Propotion | |
|---|---|---|---|---|
| US Department of Energy | - | Yes | - | Detail |
| Announced Date | Round | Money Raised | Investors | |
|---|---|---|---|---|
| Apr 16, 2019 | Series E | $ 170M | Mercedes-Benz Group AG | Detail |
| Aug 6, 2012 | Grant | $ 499.60K | National Science Foundation | Detail |