Huawei Patents 3,000km Solid-State Battery with 5-Minute Charge

Summary

Huawei has stepped up its ambitions in advanced energy storage with a patent for a sulfide-based solid-state battery that offers driving ranges of up to 3,000 kilometres and ultra-fast charging in just five minutes. The development signals a significant push by the tech giant to stake a claim in the fast-evolving solid-state battery landscape. The patent outlines a solid-state battery architecture with energy densities between 400 and 500 Wh/kg, potentially two to three times that of conventional lithium-ion cells. The filing also details a novel approach to improving electrochemical stability: doping sulfide electrolytes with nitrogen to address side reactions at the lithium interface, a long-standing obstacle to the commercialisation of sulfide-based batteries. Huawei’s design aims to boost safety and cycle life by mitigating degradation at this critical junction. Huawei’s involvement in solid-state battery research reflects a broader trend among Chinese technology and automotive companies. While Huawei does not manufacture power batteries, it has shown increasing interest in upstream battery materials. Earlier in 2025, the company filed a separate patent on the synthesis of sulfide electrolytes — a key material known for its high conductivity but also high cost, sometimes exceeding the price of gold. China’s EV and tech sectors are aggressively exploring solid-state battery technologies to reduce reliance on established battery suppliers such as CATL and BYD. Companies like Xiaomi, and Nio, depend on third-party battery manufacturers. Still, they are seeking ways to integrate vertically and regain control over this high-cost component, which can account for more than half of an EV’s production cost. We reported recently that Xiaomi filed a patent for a composite electrode structure to optimise ion transport. The move highlights the strategic value that Chinese tech firms now place on battery innovation, not just for vehicles but potentially for mobile electronics...