Hydrogen-Based Materials: A Key Technological Breakthrough Reshaping the Energy Storage Landscape of Electric Vehicles

Introduction

Against the backdrop of accelerating global transportation electrification, two major technical routes—battery and hydrogen energy—have been developing in parallel. The multi-institutional review article "Hydrogen-based materials for energy storage and conversion" recently published in *Nature Reviews Clean Technology* systematically outlines the current status and prospects of hydrogen-based materials in hydrogen storage, compression, batteries, and thermal energy storage. This research, completed by more than 30 leading institutions worldwide, provides an authoritative technical reference for assessing the role of hydrogen energy in the electric vehicle industry.

Industry Background

The core challenges currently facing the electric vehicle industry include range anxiety, charging time, battery cost, and resource availability. Although lithium-ion batteries have dominated the passenger car sector, hydrogen fuel cell vehicles still hold unique advantages in commercial vehicles, heavy trucks, long-haul transport, and other scenarios. Meanwhile, solid-state batteries are regarded as a next-generation key technology, and hydrogen-based materials are showing potential precisely in the field of solid electrolytes. In addition, large-scale hydrogen storage and transportation are prerequisites for realizing the "hydrogen economy" and are directly related to the construction and economics of hydrogen refueling station networks for fuel cell vehicles.

Key Advances

1. Hydrogen Storage Materials: From Physical Adsorption to Chemical Hydrides

The review points out that short-cycle reversible hydrogen storage can be achieved through physical adsorption in high-surface-area porous materials (e.g., MOFs), while metal hydrides (e.g., magnesium-based, rare-earth-based) can enable high-density long-term hydrogen storage at near-ambient pressure and low temperatures. Liquid organic hydrogen carriers (LOHC) and ammonia have also gained widespread attention as long-distance large-scale hydrogen storage carriers. These technical routes provide solutions for different scenarios, including stationary hydrogen storage and onboard hydrogen storage.

2. Metal Hydride Compressors

To meet the pressure requirements of Type IV high-pressure hydrogen storage tanks (used in first-generation commercial fuel cell vehicles), metal hydride compressors can achieve high-pressure compression without mechanical moving parts. This technology can reduce the complexity and maintenance costs of hydrogen refueling station equipment.

3. Application of Hydrides in Battery Technology

• The review emphasizes that hydrides remain important in battery technology:
• Nickel-metal hydride (Ni-MH) batteries: Metal hydride electrodes are still widely used in hybrid electric vehicles, with global annual production continuing to grow;
• Next-generation solid-state batteries: Hydrides can serve as solid electrolytes and are expected to be used in new types of batteries with metal anodes such as magnesium and calcium;
• Liquid electrolytes: Hydrides also have potential applications in novel flow batteries.

4. Thermal Energy Storage Materials

Metal hydrides, due to their high thermal storage capacity, can significantly reduce the volume of concentrated solar thermal power generation and industrial waste heat recovery systems, indirectly enhancing the synergy between clean energy and EV charging networks.

Industry Impact### Supply Chain Perspective The development of hydrogen-based materials will affect the demand for various key resources. For example, the supply chains of rare earth elements (used in some hydrogen storage alloys) and magnesium (lightweight, high-capacity hydride) will draw attention. At the same time, the maturation of hydride compressors and hydrogen storage technologies may reduce the cost of hydrogen refueling infrastructure, promoting the large-scale deployment of fuel cell vehicles (FCVs).

Automakers and Battery Companies - Toyota, Hyundai and other automakers adhering to the FCV route will benefit from efficient hydrogen storage and compressor technologies; - BYD, CATL and other battery giants need to pay attention to the hydride solid-state electrolyte technology pathway, which may affect the competitive landscape of next-generation solid-state batteries; - Panasonic, LG Energy Solution and other Ni-MH battery producers may gain opportunities for technological upgrading.

Charging and Infrastructure Metal hydride compressors can simplify the design of hydrogen refueling stations, reduce construction costs, and thereby accelerate the deployment of hydrogen refueling networks. This complements charging infrastructure, promoting the model of integrated “charging + hydrogen refueling” energy supply stations.

Challenges and Risks

• Despite the promising prospects, hydrogen-based materials still face key bottlenecks:
• Cost and Efficiency: Some hydrogen storage alloys are expensive, and their cycle life needs improvement;
• System Integration: The gravimetric and volumetric energy densities of on-board hydrogen storage systems require further optimization;
• Technology Pathway Selection: In the solid-state battery field, there are multiple electrolyte options (sulfide, oxide, hydride), and the hydride pathway must compete with mainstream routes;
• Infrastructure Supporting: The dehydrogenation processes of LOHC and ammonia require additional energy, and the full-chain efficiency needs to be enhanced.

Future Outlook

The review indicates that the technological iteration of hydrogen-based materials is moving from the laboratory to demonstration applications. It is estimated that within 5–10 years, metal hydride compressors and novel hydrogen storage materials are expected to achieve commercialization in hydrogen refueling stations and stationary energy storage. In the battery field, hydride solid-state electrolytes may first be applied in small consumer electronics or special vehicles, and then gradually penetrate into passenger cars.

Conclusion

Breakthroughs in hydrogen-based materials are providing diversified options for global transportation electrification. From efficient hydrogen storage to novel battery electrolytes, these technologies not only concern the reconstruction of the hydrogen energy industry chain but will also profoundly affect the construction pathways of charging infrastructure and the development pattern of smart mobility. As the energy transition accelerates, hydrogen-based materials are expected to play an even more critical role in a low-carbon transportation system.