Chinese automaker BYD announced that it is on track to introduce its first electric vehicle powered by an all‑solid‑state battery (ASSB) in 2027, positioning itself as a front‑runner in the emerging solid‑state market. Executive Vice‑President Stella Li told Electrek that BYD’s “solid‑state technology will deliver an energy density of over 500 Wh kg⁻¹, a 30 % improvement on our current lithium‑ion packs, while eliminating the flammable liquid electrolyte”【Electrek – BYD leading solid‑state battery race】.

The claim is significant because most solid‑state demonstrations to date remain in pilot‑scale labs, with energy densities hovering around 350‑400 Wh kg⁻¹. If BYD can achieve the advertised 500 Wh kg⁻¹ at commercial scale, it would enable a 400‑km range on a 70‑kWh pack, dramatically reducing vehicle weight and cost per kilometre. The company also highlighted a projected cycle life of 1,500 full‑charge cycles, a figure that would address one of the lingering durability concerns for sulfide‑based electrolytes.

BYD’s roadmap includes a dedicated “solid‑state battery line” at its Shenzhen plant, slated to start low‑volume production in late‑2026. The firm plans to use a sulfide‑based ceramic electrolyte paired with a lithium‑metal anode, a combination that promises high ionic conductivity (≈10⁻³ S cm⁻¹) and robust interfacial stability. To mitigate the notorious dendrite formation on lithium metal, BYD says it has introduced a thin interlayer of lithium‑phosphorous‑oxynitride (LiPON) that acts as a mechanical barrier.

Why it matters: BYD is the world’s largest EV seller, and its entry into solid‑state production could accelerate supply‑chain investments, from raw‑material sourcing (sulfur, germanium) to equipment for dry‑electrode coating. Competitors such as QuantumScape and ProLogium have already announced mass‑production plans, but a Chinese OEM with BYD’s scale could tip the economics in favour of ASSBs faster than the Western rollout. Analysts estimate that a successful launch could shave $150–$200 from the cost of a 70‑kWh pack, making solid‑state vehicles price‑competitive with conventional lithium‑ion models by the early 2030s.

The announcement also underscores a broader shift: automakers are moving from “research‑only” statements to concrete product timelines, suggesting that the solid‑state bottleneck—manufacturing at scale—may finally be cracking. The next milestones to watch are prototype validation in 2025 and a pilot‑run of 5,000 cells in 2026, which will reveal whether BYD can translate lab‑grade performance into a reliable, mass‑produced product.

Sources: Electrek – BYD leading solid‑state battery race.

Kyushu Electric Power Co. announced a strategic equity investment in Taiwanese solid‑state pioneer ProLogium, deepening a partnership that began in 2023 to develop next‑generation sulfide‑based solid electrolytes for grid‑scale energy storage. The press release on ProLogium’s website details a ¥12 billion (≈ US$78 million) capital injection, earmarked for a new pilot line at ProLogium’s Hsinchu facility and a joint R&D centre focused on high‑voltage cathode‑electrolyte compatibility【ProLogium – Kyushu Electric Power Advances Strategic Investment】.

The collaboration targets a “next‑generation solid‑state cell” that can operate at 4.5 V and deliver a specific energy of 450 Wh kg⁻¹, a performance envelope that would enable utility‑scale storage systems with a footprint 40 % smaller than today’s lithium‑ion farms. ProLogium’s proprietary argyrodite‑type sulfide electrolyte, which boasts an ionic conductivity of 2 × 10⁻³ S cm⁻¹ at room temperature, will be paired with a lithium‑metal anode and a high‑nickel NMC cathode. The joint team aims to resolve two critical hurdles: (1) long‑term interfacial stability under high‑voltage cycling, and (2) scalable dry‑electrode coating that avoids the costly slurry‑casting step.

For Kyushu Electric Power, the investment aligns with Japan’s “Carbon‑Neutral 2050” roadmap, which calls for 30 % of electricity to come from renewable sources and a corresponding surge in stationary storage. By securing a supply of high‑energy solid‑state modules, the utility hopes to smooth the intermittency of offshore wind farms in the Kagoshima basin, reducing reliance on gas peaker plants.

Industry observers note that the partnership could give ProLogium a foothold in the Japanese market, historically dominated by domestic players such as Panasonic and Sony. Moreover, the joint R&D centre will adopt a “digital twin” approach, using AI‑driven simulations to accelerate electrolyte formulation cycles from months to weeks. If successful, the first commercial‑grade 10 kWh solid‑state modules could be shipped by late‑2028, positioning Kyushu Electric Power as one of the first utilities to deploy ASSB storage at scale.

The deal also signals a broader trend of utilities becoming direct investors in battery technology, bypassing traditional venture‑capital routes. As capital flows directly into manufacturing capacity, the cost curve for solid‑state cells could steepen faster than projected, potentially reaching $120 kWh⁻¹ by 2030—a price point that would make large‑scale deployment economically viable for grid operators worldwide.

Sources: ProLogium – Kyushu Electric Power Advances Strategic Investment.

French battery specialist Blue Solutions announced a joint safety‑validation programme with automotive engineering firm AVL, aimed at de‑risking the scale‑up of its fourth‑generation GEN4 lithium‑metal solid‑state cells. The partnership, detailed on Blue Solutions’ corporate site, will combine AVL’s expertise in thermal‑management testing with Blue Solutions’ proprietary ceramic electrolyte platform to produce a “complete safety dossier” required for mass‑production certification in Europe and North America【Blue Solutions – Blue Solutions and AVL Launch Complete Joint Safety Program】.

GEN4 cells employ a garnet‑type LLZO (lithium‑lanthanum‑zirconium‑oxide) ceramic electrolyte, delivering an ionic conductivity of 1.2 × 10⁻³ S cm⁻¹ and enabling a cell‑level energy density of 420 Wh kg⁻¹. The new safety programme will subject the cells to a battery of abuse tests, including over‑charge, nail‑penetration, thermal runaway, and high‑temperature storage, all performed under AVL’s ISO‑26262‑compliant facilities. Early results, shared by Blue Solutions, indicate that GEN4 cells can withstand a 150 °C thermal event for 30 seconds without catastrophic failure, a marked improvement over earlier solid‑state prototypes that exhibited rapid degradation above 120 °C.

The collaboration also tackles the “dry‑electrode” manufacturing challenge that has hampered many solid‑state roll‑outs. By integrating AVL’s high‑speed roll‑to‑roll coating line, Blue Solutions aims to produce electrode sheets with a thickness uniformity of ±5 µm, reducing internal resistance and enabling fast‑charge capability of 1 C (≈ 350 W kg⁻¹). The joint team plans to pilot a 500 kWh production line in 2027, targeting automotive OEMs that require both high energy and stringent safety standards for next‑generation electric vehicles.

Strategically, the partnership positions Blue Solutions to compete directly with Asian rivals such as QuantumScape and ProLogium, which have focused heavily on cell‑level performance but have yet to publish comprehensive safety data at scale. By delivering a validated safety package, Blue Solutions hopes to secure supply contracts with European manufacturers that are under pressure to meet the EU’s upcoming Battery Regulation, which mandates rigorous safety and sustainability assessments for all battery chemistries entering the market after 2027.

If the programme meets its milestones, Blue Solutions could begin volume shipments of GEN4 packs to commercial fleets by 2029, potentially delivering a 70 % increase in vehicle range compared with conventional lithium‑ion packs of similar size—a claim the company has already demonstrated in a prototype van test. The success of this safety programme could therefore accelerate the broader adoption of solid‑state technology across the European automotive sector, setting a benchmark for regulatory compliance and performance.

Sources: Blue Solutions – Blue Solutions and AVL Launch Complete Joint Safety Program.