The Five Material Families Competing for Dominance in Solid State Hydrogen Storage

Solid state hydrogen storage stores hydrogen within the crystal lattice or porous structure of a solid material — absorbing it under pressure and releasing it on demand through heat — and the patent record in 2025–2026 shows five distinct material families competing to solve that challenge at commercially viable performance levels. Understanding which families are attracting the most IP activity is the first step in mapping where the technology is heading.

The first and most established family is intermetallic alloys. These include TiFe-based, TiMn-based, and rare earth-Mg-Ni alloys that absorb hydrogen reversibly at near-ambient conditions. The second is light-metal hydrides, centred on magnesium hydride (MgH₂), which offers high gravimetric hydrogen density but requires elevated temperatures for desorption. The third is complex hydrides — metal borohydrides including lithium, sodium, and potassium borohydride — which carry very high hydrogen content by weight but face reversibility challenges. The fourth, and increasingly prominent, family is high-entropy alloys (HEAs) with body-centred cubic (BCC) structures, where multi-element disorder is used to tune hydrogen absorption thermodynamics. The fifth is metal-organic frameworks (MOFs), porous crystalline materials that can be further decorated with metal nanoparticles such as Pd, Ni, and Pt to enhance hydrogen uptake and release.

Within the intermetallic alloy family, crystal structure engineering is the primary lever of innovation. Honda Motor Co. Ltd has filed multiple patents covering rare earth-Mg-Ni superlattice alloys with A2B7 and Ca2Mg6Ni16 type crystal structures, as well as AB5 (CaCu5 type) and AB2 (MgNi2 type) combinations. Guangdong Hunan Rare Earth New Energy Materials Co. Ltd has patented alloys with a Ca5Mg1Ni9 main phase (AB3 type) and secondary phases of A2B7 and/or AB5 type. This multi-phase architecture approach — deliberately combining crystal structure types — is a recurring motif in the most recent filings, as it allows independent optimisation of capacity, kinetics, and plateau pressure.

For the complex hydride family, the Dalian Institute of Chemical Physics (Chinese Academy of Sciences) has patented a preparation method for diborane using lithium, sodium, or potassium borohydride as raw material, pre-activating with a catalyst in a solid-phase reactor, then reacting with hydrogen fluoride or hydrogen chloride gas. The University of Hawaii has patented reversible hydrogen storage using metal borohydride disposed on the surface of a porous inorganic substrate with amine groups — a hybrid approach that combines the high hydrogen density of complex hydrides with the structural support and surface area advantages of porous materials, addressing the reversibility limitation that has historically constrained this family.

Who Holds the IP: Key Assignees and Their Strategic Bets in Solid State Hydrogen Storage

The assignee landscape for solid state hydrogen storage patents in 2023–2025 reveals a clear split between Japanese automotive OEMs pursuing near-term vehicle applications, Japanese and Chinese academic institutions advancing materials science, and European and Chinese system integrators solving the engineering challenges of commercialisation.

Honda Motor Co. Ltd’s strategy is clearly centred on superlattice alloy architecture. Its 2022 patent (US11649162B2) covers a rare earth-Mg-Ni superlattice alloy formed by stacking AB5 and AB2 unit cells. Its 2023 filing (US20230249971A1) advances this by targeting a higher degree of disorder through A2B7 and Ca2Mg6Ni16 layered structures to improve pressure-composition isotherm characteristics. Its 2024 application (US20240294382A1) refines the Ca2Mg6Ni16 crystal structure further. This is a coherent, progressive IP strategy — each filing building on the last to narrow the claim space around a specific alloy architecture for hydrogen storage devices.

The National University Corporation Tokai National Higher Education and Research System has taken a different approach, filing on two distinct alloy compositions. US12017908B2 (granted June 2024) covers a TiFe-based alloy with composition (Ti₁₋ₓZrₓ)(Fe₁₋yCry) where x ≤ 0.20 and y ≤ 0.20, containing a TiFe2 Laves phase (C14), a TiZrFeCr Laves phase (C14), and a CsCl-structured C2 phase. US20240228306A1 (published July 2024) covers a broader multi-element BCC alloy with rare earth additions from the lanthanide series. The dual-track approach — one filing on a defined composition, one on a structural class — provides layered IP coverage across both specific formulations and broader compositional space.

“The most sophisticated assignees in solid state hydrogen storage are not filing single patents — they are building progressive claim portfolios where each filing narrows the IP space around a specific alloy architecture, making it harder for competitors to design around the core innovation.”

Pragma Industries, a French company focused on portable fuel cell systems, has filed two US patents centred not on materials chemistry but on systems integration — specifically the use of phase change materials (PCMs) for thermal management within solid-state hydrogen storage vessels. This positions Pragma as an IP holder at the system level rather than the materials level, a strategically distinct position that is potentially applicable across multiple material families. According to WIPO, system-level integration patents of this type often generate broader licensing opportunities than material-specific filings.

Thermal Management: The Make-or-Break Systems Challenge for Solid State Hydrogen Storage

Thermal management is the central engineering challenge in solid state hydrogen storage because hydrogen absorption is exothermic — it releases heat — while desorption is endothermic, requiring heat input. Without effective thermal management, absorption rates slow as temperature rises and desorption rates are limited by available heat supply. The patent record shows two distinct thermal management approaches attracting significant IP activity.

The first approach is phase change material (PCM) integration. Pragma Industries has filed two US patents (US11440797B2, granted 2022, and US20230399207A1, published 2023) covering solid-state hydrogen storage systems where a thermal management layer of PCM is incorporated into the vessel wall or heat exchange structure. The PCM stores heat released during absorption and releases it during desorption, buffering the thermal load without requiring an active external heat exchanger. Tongji University’s CN117645264A (published March 2024) applies the same PCM principle specifically to MgH₂-based systems, specifying a PCM melting point range of 275–425°C — a range chosen to match the operating temperature window of MgH₂ desorption.

The second approach is vessel-level thermal engineering. Faurecia Systèmes d’Echappement’s US20240270559A1 (published August 2024) patents a manufacturing method for hydrogen storage vessels in which metal hydride particles are consolidated into pellets using a consolidating element inserted into the vessel’s inner volume. Consolidation improves thermal conductivity within the hydride bed — a known limitation of loose powder beds — without requiring an external heat exchanger. This manufacturing-level innovation addresses thermal management at the fabrication stage rather than through added system components.

The thermal management challenge is also influencing materials selection at the R&D stage. According to research standards tracked by ISO, intermetallic alloys such as TiFe-based and TiMn-based systems operate at near-ambient temperatures — making thermal management substantially easier than for MgH₂ systems that require temperatures above 275°C. This is reflected in Beijing Hydrogen Source Technology Co. Ltd.’s fuel cell vehicle module patent (US20250010996A1, published January 2025), which specifies TiFe-based or TiMn-based alloys specifically — materials that are viable at ambient operating temperatures relevant to vehicle applications.

From Lab to Road: Applications Driving Patent Activity in Solid State Hydrogen Storage

Three application domains are generating the majority of solid state hydrogen storage patent activity in 2023–2025: hydrogen fuel cell vehicles, portable power systems, and stationary energy storage. The vehicle application is the most commercially significant and is attracting the largest and most strategically sophisticated patent portfolios.

For hydrogen fuel cell vehicles, the key technical requirements are high volumetric hydrogen density (to minimise tank size), fast kinetics at vehicle operating temperatures, and safety (solid state storage eliminates the high-pressure vessel risk of compressed hydrogen). Beijing Hydrogen Source Technology Co. Ltd.’s US20250010996A1 patent, published in January 2025, directly addresses this application: it covers a solid-state hydrogen storage module for hydrogen fuel cell vehicles, comprising a hydrogen storage bottle, a solid hydrogen storage medium of TiFe-based or TiMn-based alloys, a heat exchange structure, and valves. The patent’s specificity — naming the vehicle application and the alloy class in the title — signals a commercial deployment intent rather than a research-stage filing.

For portable power, Pragma Industries’ system patents are explicitly designed for compact fuel cell applications where the PCM thermal management approach removes the need for active cooling infrastructure. This makes the technology viable in form factors where a conventional heat exchanger would be impractical. The H2MOF Inc. patent (US20230090916A1, published March 2023) covers MOF-based hydrogen storage materials — including MOFs decorated with Pd, Ni, or Pt nanoparticles — for reversible hydrogen storage applications, with portable and stationary applications both in scope. According to the US Department of Energy, portable hydrogen storage for fuel cell applications is a priority research area under its hydrogen programme.

For stationary energy storage, the higher operating temperatures of MgH₂ systems are less problematic — waste heat from industrial processes or power generation can supply the desorption energy requirement. Tongji University’s MgH₂ composite system patent and the Dalian Institute’s borohydride preparation work are both oriented toward this higher-temperature, higher-capacity application space. The Saudi Aramco patent on liquid organic hydrogen carrier (LOHC) systems with solid catalysts (US20230331545A1) represents an adjacent technology — not strictly solid state storage but a related approach to solid-phase catalysis in hydrogen release — indicating that the boundary between solid state and chemical hydrogen storage is increasingly blurred in the patent record.

What the Patent Landscape Signals for R&D Strategy in Solid State Hydrogen Storage

The 2025–2026 patent landscape in solid state hydrogen storage reveals several structural patterns that have direct implications for R&D investment decisions, freedom-to-operate analysis, and competitive positioning.

1. Crystal structure engineering is the primary materials battleground

The most active area of materials IP is not the discovery of new base materials but the engineering of crystal structure combinations within established material families. Honda Motor Co. Ltd’s progressive filing strategy — each patent refining the superlattice architecture of rare earth-Mg-Ni alloys — illustrates this. R&D teams working in this space need to map not just which compositions are claimed, but which crystal structure combinations and phase ratios are covered. According to EPO patent analytics guidance, structure-based claims in materials science often provide broader protection than composition-based claims and are harder to design around.

2. System-level IP is underweighted relative to materials IP

Pragma Industries’ PCM thermal management patents represent a strategically distinctive position: they are applicable across multiple material families and address the commercialisation bottleneck rather than the materials science frontier. The relative scarcity of system-level integration patents compared to materials patents suggests a white-space opportunity for organisations with engineering rather than chemistry capabilities — particularly in vessel design, heat exchanger integration, and control system architecture for hydrogen absorption and desorption cycles.

3. Chinese institutions are building parallel IP stacks

Tongji University, the Dalian Institute of Chemical Physics (Chinese Academy of Sciences), and Guangdong Hunan Rare Earth New Energy Materials Co. Ltd are filing in the CN jurisdiction on MgH₂ composites, borohydride chemistry, and rare earth alloys respectively. Beijing Hydrogen Source Technology Co. Ltd is filing in the US jurisdiction on vehicle-specific modules. This pattern — domestic research institutions filing in CN, commercial entities filing in US — suggests a coordinated national strategy to build IP coverage across the full value chain from materials to systems. Organisations assessing freedom to operate in China need to conduct separate CN-jurisdiction analysis; US patent searches alone will miss a significant portion of the relevant prior art and claims landscape. PatSnap’s patent analytics platform covers both CN and US jurisdictions with full-text search.

4. High-entropy alloys represent the highest-uncertainty opportunity

The National University Corporation Tokai’s dual-track HEA filing strategy — one patent on a defined TiFe composition, one on a broad BCC multi-element class with lanthanide additions — suggests that the HEA design space is still being mapped. The breadth of the compositional claims (12 base elements, 14 possible rare earth additions) means that the IP landscape in this sub-field is relatively open compared to the more mature intermetallic alloy space. For R&D organisations with high-throughput alloy screening capabilities, this represents a window to establish foundational IP before the field consolidates. The PatSnap Insights blog regularly covers emerging IP landscapes in clean energy materials.

The overall picture is of a technology landscape that is moving from pure materials research toward systems integration and manufacturability. The most recent filings — Beijing Hydrogen Source’s vehicle module, Faurecia’s vessel manufacturing method, Pragma’s PCM system patents — are all oriented toward solving engineering problems that arise when laboratory materials are deployed in commercial products. This shift from materials IP to systems IP is a reliable indicator that a technology is approaching commercial readiness, and it aligns with the broader trajectory of the hydrogen economy as described in reporting from the International Energy Agency.