Coreshell Raises $30M Series B for Domestic Battery Scale

Ferroglobe occupies two places in Coreshell Technologies' expansion: supplying silicon for its batteries and co-leading the capital funding their commercialization. That relationship makes the San Leandro, California company's latest financing a useful view into how a domestic battery supply chain gets assembled, with materials choices and financial backing developing together.

Coreshell reported a $30M Series B on November 11, 2026, co-led by Ferroglobe PLC and Access Industries. ADS, Helios Ventures, Pegasus Tech Ventures, Mana Ventures and Entrada Ventures also participated, with proceeds intended to support manufacturing, customer programs and commercialization.

The company develops battery technology that replaces graphite in the anode with metallurgical silicon, or MGS, sourced in the US. For manufacturers considering a change in battery supplier, Coreshell is offering a change in the upstream materials relationship as part of the product, while taking on the work of translating that sourcing proposition into repeatable production.

A supplier joins the financing decision

Ferroglobe's position gives the round a physical connection to Coreshell's manufacturing plans. The company identifies Ferroglobe as a long-term silicon supply partner, placing a producer of the input material inside the financing of the technology that would consume it. Commercialization therefore matters to both sides of the relationship, although the announcement does not disclose individual investment amounts or new supply terms.

That connection helps explain the operating significance of the raise. A cell manufacturer needs reliable inputs before it can offer reliable output, and increasing production changes what it asks of a supplier. Volumes, consistency and delivery commitments become part of a shared industrial assignment; equity participation gives the materials relationship an additional financial dimension.

Access Industries co-led the round alongside Ferroglobe. The disclosed syndicate brings several institutions into the expansion, but the release leaves the division of capital and governance terms undisclosed. Reading the investor list as a set of newly signed customer contracts would go beyond the evidence, particularly when a supplier relationship is already doing meaningful work in the story.

Coreshell's stated use of proceeds covers the commercial path around the technology as well as manufacturing. That leaves the company working across several conversations at once: with the producer of its silicon, the teams making cells, and the customers deciding how those cells fit into equipment they intend to keep operating.

The material has to tolerate the battery

Coreshell's technical explanation begins with a difficulty inside the cell: silicon expands and can degrade during cycling. The company describes a coating that helps stabilize metallurgical silicon and protect its surface, together with a cell design incorporating binders, active materials and electrolytes. Its proposition depends on making an abundant input useful through repeated charge and discharge.

The founders' earlier work helps explain that emphasis. In a September interview with Berkeley Lab's Molecular Foundry, CTO and co-founder Roger Basu traced the original concept to engineering the interface between an electrode and electrolyte. Basu and CEO and co-founder Jonathan Tan founded Coreshell in 2017, with laboratory access supporting the development of their early materials work.

For a prospective customer, the relevant outcome reaches beyond the behavior of one material. A battery has to operate inside a larger product, where qualification decisions connect performance, safety, lifetime and manufacturing consistency. Coreshell's claims about its technology describe the supplier's proposition; the public sources reviewed for this financing do not provide an independent, matched-condition comparison that settles every customer's application.

That distinction keeps the commercial argument useful. Domestic silicon can change the sourcing route, while the engineering around it determines the cell a buyer can actually adopt. Coreshell is bringing those questions into the same product conversation, with its coating and full-cell design carrying the responsibility for making the material substitution practical.

The cathode has its own supply chain

Replacing an anode's graphite addresses one side of the cell. Coreshell's corrected July announcement describes an eight-year agreement with L&F for lithium-iron phosphate cathode active materials, extending the company's sourcing arrangements to the other electrode. The agreement concerns LFP material, a more precise description than treating it as a raw-lithium purchase.

Together, these arrangements reveal the breadth of the purchasing problem Coreshell is trying to solve. A manufacturer choosing a battery inherits several upstream relationships through a single component. The ability to explain where those materials come from can therefore become part of the sales conversation, alongside what the battery does once installed.

Coreshell positions its technology for defense, mobility and energy-storage applications. Those markets bring different equipment and purchasing requirements, so a general sourcing proposition still has to become an application-specific agreement. The company's public compliance language is its own assertion; this financing announcement does not establish a universal procurement determination for every potential customer.

Financing the move into production

The Series B follows company-reported $50M Department of Energy support announced in August. That earlier statement described planned capacity of approximately 2 GWh for electrode manufacturing and 1.5 GWh for cell assembly, with AM Batteries contributing cathode dry-coating technology as a subrecipient. These are planned manufacturing capabilities, rather than output already delivered by a completed factory.

The federal support and the $30M financing are separate capital events. Coreshell previously announced a $12M Series A in February 2022, but the current announcement does not provide a reconciled lifetime funding total or valuation. Keeping those categories separate also keeps the industrial question visible: which work each source of capital is intended to support.

As Coreshell expands manufacturing and customer programs, the relationships around its silicon will have to develop with the cells. Ferroglobe participates upstream and financially, L&F supplies the cathode-material route, and Tan and Basu lead a company selling buyers on the practical value of that arrangement. The sourcing story now travels toward production, where customers will need it to remain legible through the next delivery.