Progress of the U.S. Battery500 Project in 2026

The U.S. Department of Energy previously proposed the Battery500 project with the goal of achieving a battery energy density of 500 Wh/kg.

Launched in October 2021, the five-year, $75 million initiative aims to develop lithium-metal batteries with a specific energy of 500 Wh/kg — nearly triple the energy density of current EV batteries (170–200 Wh/kg).

Led by the Pacific Northwest National Laboratory (PNNL), the consortium brings together researchers from national laboratories and leading universities. The project received $15 million in fiscal year 2025, with $14 million planned for 2026 to carry it through completion.

The goal is to develop next-generation high-energy, low-cost batteries for electric vehicles, with the design, fabrication, and validation of pouch cells achieving 500 Wh/kg, scaled up to a capacity of 5–10 Ah, and a cycle life of 1,000 cycles.

Today we share the Battery500 project progress PPT for 2026.

Current milestones are as follows: the 300 Wh/kg Li-S battery is targeted to reach 200 cycles (by September 2026), the 500 Wh/kg battery is targeted to exceed 250 cycles, and the 450 Wh/kg pouch cell is targeted to exceed 300 cycles. All milestones are currently on track and progressing as scheduled.

The core strategy includes: achieving fundamental breakthroughs in high-energy electrode materials, rapidly integrating R&D from materials to full-scale battery cells, leveraging DOE resources to elucidate degradation mechanisms, and strengthening multidisciplinary collaboration as well as industry-university-research partnerships.

The technical roadmap encompasses high-capacity cathodes, novel sulfur cathodes, new electrolytes, stable interfaces, high-loading electrode fabrication, lithium anode stabilization, as well as the full-chain scale-up and validation from materials to pouch cells.

The Battery500 roadmap established in 2016 is highly consistent with the actual results achieved in 2026, and high-specific-energy battery research has strictly followed this roadmap throughout.

The manufacturing processes and performance of high-energy batteries have been steadily improved. Strategies such as Nb modification have enhanced the stability of high-nickel NMC cathodes. However, when high-nickel cathodes are paired with lithium metal anodes, the interfacial impedance is higher than when paired with graphite anodes, which is attributed to the cross-talk effect between the positive and negative electrodes.

The developed localized high-concentration electrolytes and polymer electrolytes have set records in coulombic efficiency and cycle life, and have become benchmarks in both academia and industry.

The low-cost sulfurized polyacrylonitrile (SPAN) system has demonstrated potential as an alternative to conventional lithium-ion systems, with continuous improvements in cathode capacity, sulfur utilization, loading levels, and suppression of lithium dendrite formation.

Battery500 has established a comprehensive vision, roadmap, design principles, and testing protocols. With breakthroughs in electrolytes and electrode materials, it has successfully and progressively advanced pouch cell energy from 350 Wh/kg to over 500 Wh/kg.