Overview

Tracks advances in battery chemistry and storage technology, with a focus on solid-state batteries, flow batteries, and the companies and researchers pushing energy density and cycle life forward.

Key Themes

  • Solid-state electrolytes (oxide, sulfide, polymer)
  • High-energy-density cathode and anode materials
  • Leading manufacturers and research institutions
  • Safety, scalability, and cost-to-production challenges

Companies

Startups & Development Partners

Company HQ Stage Mission
Factorial Energy Cambridge, MA, USA Pre-IPO Semi-solid FEST® electrolyte platform; 375 Wh/kg validated with Stellantis; JDAs with Mercedes-Benz, Hyundai, Kia; expanding to drones/robotics.
Donut Lab Estonia (Finnish roots) Private Solid-state battery startup with production-ready cells in Verge Motorcycles; 400 Wh/kg and 100k-cycle claims unverified.
Nordic Nano Finland Private Manufacturing partner producing Donut Lab’s amorphous titanium dioxide nanostructure-based cells.
ProLogium Technology Taiwan Pre-IPO Oxide-based solid-state pioneer (est. 2006); Superfluidized All-Inorganic architecture unveiled CES 2026; Dunkirk gigafactory groundbreaking 2026.
Adden Energy Cambridge, MA, USA Series A Harvard SEAS spinout; thin-film solid-state cells; 10,000-cycle and 10-min charge in lab; $20M raised; pilot line under construction.
Lyten San Jose, CA, USA Series B+ 3D Graphene-enabled lithium-sulfur batteries; ~2× Li-ion energy density; no nickel/cobalt/graphite; $625M+ raised; acquired Northvolt BESS facility.
Verge Motorcycles Finland Private Electric motorcycle OEM; launch platform for Donut Lab solid-state cells; TS Pro shipping 2026.
Idemitsu Kosan (Battery Materials) Japan Public subsidiary 30-year sulfide electrolyte R&D; exclusive Toyota supplier; ¥21.3B Li₂S plant + solid electrolyte pilot plant under construction.

Public Companies

Ticker Company Mission
QS QuantumScape Solid-state lithium-metal battery developer; sulfide-based separator; shipping B-samples to auto customers in 2025–2026.
SLDP Solid Power All-solid-state lithium battery developer on roll-to-roll production line; cells in BMW i7 validation.

Incumbents

Ticker Company Relevance
TM Toyota Largest solid-state patent holder; signals commercial timeline (2027–2028 target); key customer for Idemitsu sulfide electrolyte.
006400.KS Samsung SDI Major cell manufacturer targeting 500 Wh/kg solid-state; market validation signal for Korea cell supply chain.
PCRFY Panasonic Lithium-ion incumbent (Tesla supplier) with solid-state R&D; no firm timeline; indicator of when the technology reaches mainstream tier-1 supply.
300750.SZ CATL 🇨🇳 World’s largest EV battery maker; solid-state target ~2027; treat claims with additional skepticism.

Note on CATL: Chinese-owned. Performance claims and production timelines should be treated with additional skepticism until independently verified by non-affiliated third parties.

Entries

  • Adden Energy — Harvard SEAS spinout developing thin-film solid-state lithium batteries with demonstrated 10-minute fast charging and 10,000+ cycle lab results; $20M raised; pilot production line under construction in Waltham, MA.
  • Donut Lab — Finnish-Estonian battery startup claiming the world's first solid-state battery in production vehicles, powering 2026 Verge Motorcycles models — though headline performance specs remain independently unverified.
  • Factorial Energy — Cambridge, MA startup developing the FEST® semi-solid electrolyte platform; validated 375 Wh/kg cells with Stellantis and multiple OEM partners; expanding into drones and robotics.
  • Idemitsu Kosan — Solid-State Electrolyte Program — Japanese oil major pivoting to lithium sulfide and solid electrolyte production; exclusive supplier to Toyota's solid-state battery program; ¥21.3B lithium sulfide plant operational by June 2027; large-scale solid electrolyte pilot facility construction began January 2026.
  • Lyten — San Jose startup pioneering 3D Graphene-enabled lithium-sulfur batteries; claims ~2× energy density vs lithium-ion with no nickel, cobalt, or graphite; $625M+ raised; acquired Northvolt's European BESS facility; gigafactory planned near Reno.
  • ProLogium Technology — Taiwanese solid-state battery pioneer with 20 years of development; commercialized the first 100% ceramic separator in 2013; unveiling Superfluidized All-Inorganic architecture in 2025–2026; Dunkirk gigafactory construction beginning 2026.
  • QuantumScape — San Jose solid-state battery pure-play; sulfide-based ceramic separator using proprietary Cobra process; QSE-5 B-samples shipping to automotive customers as of Q3 2025; Eagle Line pilot production inaugurated Feb 2026; Murata manufacturing partnership for ceramic separator scale-up.
  • Solid Power — Louisville, CO solid-state battery pure-play (NASDAQ: SLDP); sulfide electrolyte supplier model; cells in BMW i7 validation; Samsung SDI manufacturing partnership announced Oct 2025; continuous electrolyte production line targeted end of 2026.
  • Solid-State Batteries — Overview of solid-state battery technology — replacing liquid electrolytes with solid materials for higher energy density, improved safety, and longer cycle life.
  • Verge Motorcycles — Finnish electric motorcycle manufacturer and launch platform for Donut Lab solid-state cells; world's first production motorcycle with solid-state batteries; TS Pro shipping in 2026 with 217–370 mile range and 200 kW charging.