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Solid Power (NASDAQ: SLDP): Solid-State Battery Cell Technology & Electrolyte IP
The Colorado startup that turned its solid electrolyte patents into supply deals with two of Korea's biggest battery makers and Germany's biggest automaker.
Who they are
Solid Power (Nasdaq: SLDP) is a Louisville, Colorado developer of sulfide-based solid electrolyte technology, one of the small handful of companies that actually holds foundational IP in this space rather than just talking about it. It's been working with BMW since 2017, went public via a 2021 SPAC merger, and — unlike some of its more famous pre-revenue peers — has spent the past few years turning R&D relationships into paid electrolyte supply and licensing deals with real battery makers.
What they do
Solid Power's core product is a sulfide-based solid electrolyte — the material a growing share of the industry has settled on as the most manufacturable path to a working all-solid-state cell. The company supplies electrolyte samples and licenses to partners rather than building its own gigafactory: it completed factory acceptance testing for a pilot cell line installed at SK On's facility, and separately built out a continuous-manufacturing pilot line for its own sulfide electrolyte production, on track for commissioning by the end of 2026.
How they make money
Revenue is still small and mostly milestone-driven — $21.7 million in fiscal 2025, up modestly from 2024, largely tied to work under its SK On agreement. Operating expenses of $122.6 million meant a $93.4 million net loss for the year, and the company guided to $85–100 million in cash spend for 2026 while it builds out manufacturing capacity. With $336.5 million in total liquidity at the end of 2025 (helped by a $130 million registered direct offering in Q1 2026), Solid Power has runway — but this is still very much a pre-commercial-scale company funding its build-out with capital markets, not electrolyte sales.
Where it sits in the value chain
Solid Power sits in Cell Technology & IP — the layer that owns the electrolyte chemistry and licenses or supplies it to the companies that actually manufacture cells and vehicles. It's the same tier QuantumScape occupies, though the two take different technical routes: Solid Power backs a sulfide electrolyte, QuantumScape a ceramic-separator oxide route.
The bigger trend
October 2025 was Solid Power's biggest validation moment yet: a three-way Joint Evaluation Agreement with Samsung SDI and BMW to develop and test a demonstration vehicle running on all-solid-state cells, with Solid Power supplying the sulfide electrolyte, Samsung SDI building the cells, and BMW evaluating the finished vehicle. It's a rare case of a small-cap IP holder sitting at the center of a deal between two much bigger industry names — and a sign that the "who's actually credible in sulfide electrolyte" list is short enough that Solid Power made the cut twice, once through BMW and once through SK On.
What to watch
- Whether the continuous electrolyte production pilot line commissions on schedule by end of 2026 — the step that determines if Solid Power can actually supply at meaningful volume.
- Progress on the SK On line-installation agreement transitioning from an R&D supply deal into a long-term commercial supply agreement, which Solid Power has said could happen once the current multi-year, 8-metric-ton R&D phase wraps.
- Whether the Samsung SDI × BMW demonstration vehicle program produces a named production timeline, or stays a technology-validation exercise.
Related companies
FAQ
Does Solid Power manufacture its own batteries?
No. It develops and supplies sulfide-based solid electrolyte and licenses its cell technology, leaving the actual battery manufacturing to partners like Samsung SDI and SK On. Its own pilot lines are for producing electrolyte and sample cells, not commercial-scale batteries.
Is Solid Power profitable?
No. It posted a $93.4 million net loss for fiscal 2025 on $21.7 million of revenue, and expects to keep spending $85–100 million in cash during 2026 as it builds out manufacturing and development capacity. It's a pre-commercial-scale company still funded largely through capital markets.
What's Solid Power's relationship with BMW and Samsung SDI?
Solid Power and BMW have had a joint development agreement since 2017, extended in 2024 alongside a $130 million BMW-led Series B investment. In October 2025, Samsung SDI joined that relationship through a three-way Joint Evaluation Agreement, under which Solid Power supplies sulfide electrolyte, Samsung SDI builds the cells, and BMW evaluates the resulting demonstration vehicle.