Prussian Blue Cathode Patents: Leaders, Trends & White Space 2026
Filing growth compares 2021 (3 records) with 2024 (36) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 133 records in scope (CR5), not by the ranked leaders only.
What this patent set covers
Prussian blue and Prussian blue analogue cathodes are one of the main chemistry routes being pursued for sodium-ion batteries, alongside layered oxides and polyanionic materials. This landscape draws on 133 published records filed between 2015 and mid-2026 that combine Prussian blue cathode terminology with the core battery-cell IPC class H01M10/054, giving a focused view of a chemistry-specific slice of the wider sodium-ion patent space.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend understate real filing activity; 2024 is the most recent year that can be read as a complete picture of the field's momentum.
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Filing trend and technology composition
Two views of the same 133 records: how filing activity has moved year over year, and which IPC subclasses the underlying documents also sit in.
A sharp acceleration through 2024
Annual filings rose from 16 in 2017 to a peak of 36 in 2024, with the sharpest climb concentrated in 2021-2024 — a +1100% rise across that span. 2025 and 2026 figures are still filling in as publications catch up with filing dates, so they should not be read as a slowdown.
Concentrated in cell chemistry, with a cyanide-compound signature
Every record sits in H01M (batteries, cells & fuel cells) by construction of the search. The next-largest signal is C01C (ammonia, cyanides & nitrogen compounds) at 9.8% of the 133 records — a direct fingerprint of the hexacyanometallate framework chemistry behind Prussian blue cathodes. Nanotechnology (B82Y), other metal compounds (C01G), coatings (C09D) and grid/power supply (H02J) each appear in a small minority of records, marking narrower adjacent claim areas rather than separate technology clusters.
Shares are the percentage of the 133 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Sodium-Ion Batteries: Prussian Blue Cathode Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion batteries: prussian blue cathode patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
Prussian Blue Cathode Material and Preparation Method Therefor, Cathode Sheet and Sodium-Ion Battery
The present disclosure provides Prussian blue cathode material and preparation method therefor, cathode sheet and sodium-ion battery. The Prussian blue cathode material includes a Prussian blue compound with a general chemical formula of NaxFe[Fe(CN)6]y·nH2O. The material is described as having a simple synthesis method and low raw material cost, and when applied to a sodium-ion battery is conducive to improving specific capacity, coulomb efficiency, rate performance and long cycle stability.Filed by Hubei Wanrun New Energy Technology Co., Ltd., published 2026-07-02 — one of the most recent records in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180138554A1 | Rechargeable Aluminum Ion Battery | 55 |
| 2 | CN108574085A | 一种低温锌离子电池 | 51 |
| 3 | US8951673B2 | High rate, long cycle life battery electrode materials with an open framework structure | 44 |
| 4 | CN110235292A | 一种高钠含量普鲁士蓝正极材料及其制备方法和应用与钠离子电池 | 39 |
| 5 | WO2013157660A1 | Alkali and alkaline-earth ion batteries with hexacyanometallate cathode and non-metal anode | 25 |
| 6 | JP2015515081A | ヘキサシアノ金属酸塩正極、および非金属負極を備える、アルカリイオン電池およびアルカリ土類金属イオン電池 | 23 |
| 7 | CN104247131A | 具有六氰基金属酸盐正极和非金属负极的碱金属和碱土金属离子电池 | 23 |
| 8 | CN106745068A | 一种低缺陷的纳米普鲁士蓝的制备方法及其应用 | 21 |
| 9 | CN107039622A | 一种基于石墨/普鲁士蓝正极材料的钠离子电池的制备方法 | 20 |
| 10 | US20200058922A1 | Electrochemical cells and methods of making and using thereof | 19 |
Citation counts reward older filings that have had more time to accumulate references; treat them as a measure of influence within this corpus, not as a ranking of current technical importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Four read-outs from the assignee ranking, filing trend and jurisdiction spread that matter for anyone deciding where to file or partner next.
A narrow leading group, not a single dominant player
The leader holds 27 records and fifth place holds 7 — a real gap at the top, but the top five together already account for 52.6% of the 133 records in scope. The top ten extend that to 71.4%, leaving a long tail of assignees with only a handful of filings each.
Activity accelerated sharply, then the record thins as publication catches up
Annual filings went from 3 in 2021 to 36 in 2024, tracking sodium-ion's shift from research interest toward pilot and commercial-scale production. Figures for 2025 and 2026 are still incomplete because of publication lag and should not be read as a cooling trend.
The hexacyanometallate framework leaves a clear secondary footprint
Beyond the core battery-cell classification, the next most common secondary class is C01C — ammonia, cyanides and nitrogen compounds — appearing in 9.8% of the 133 records. This tracks directly with the cyanide-based framework chemistry that defines Prussian blue and its analogues.
Filing activity is spread across major offices rather than clustered in one
The United States leads with 35 filings, but China, the European Patent Office and the WIPO PCT route each carry 22 — a signal that applicants are pursuing multi-jurisdiction protection rather than treating any single market as sufficient.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion batteries: prussian blue cathode patent landscape, with the prior art for and against each one.
Where to take this
The dataset points to a field that is still forming its competitive structure. These are the questions worth pursuing with more targeted analysis.
Map the co-filing relationships
A small number of co-assignee pairs — the strongest linking two Nordic and European players — suggest joint development or supply agreements worth tracing further before assuming any single company is acting alone.
Explore assignee networks in EurekaTrack the under-claimed adjacent branches
Coatings, grid-scale integration and nanostructuring each show only a handful of records against this chemistry, which is a different signal from a crowded core claim space around the cathode material itself.
Run a white-space search in EurekaWatch the 2025-2026 filings as they resolve
Because publication lags filing, the true scale of 2025 and 2026 activity will only become visible over the next 12-18 months; revisit the trend once those years mature.
Set up filing alerts in EurekaCommon questions about this landscape
The assignee ranking in this dataset covers 54 companies, with the leader holding 27 of the 133 records in scope and fifth place holding 7. The top five assignees combined account for 52.6% of all records, and the top ten account for 71.4%, so the field has a identifiable leading group but is far from a one-company monopoly. Below the top ten sits a long tail of assignees with only a few filings each, which is typical of a chemistry still moving from research into commercial production.
Annual filings rose from 3 in 2021 to 36 in 2024, a growth of roughly +1100% across that three-year span, and the field's overall peak year to date is 2024. Filings in 2025 and 2026 appear lower in the raw data, but that reflects publication lag of roughly 18 months rather than a real slowdown, since recent filings have not all surfaced in public records yet. The honest read is that activity accelerated sharply through 2024 and the most recent two years remain provisional.
The United States receives the most filings at 35, followed by China, the European Patent Office and the WIPO PCT route each at 22, with India at 11 and Japan at 5. This spread across major offices, rather than concentration in a single jurisdiction, indicates applicants are pursuing protection in multiple key battery-manufacturing and demand markets simultaneously. It also means freedom-to-operate analysis for this chemistry needs to check several offices rather than one home jurisdiction.
Every record in this set sits in H01M (batteries, cells and fuel cells) by construction of the search, but 9.8% of the 133 records also carry a C01C classification covering ammonia, cyanide and nitrogen compounds — a direct match to the hexacyanometallate framework at the heart of Prussian blue chemistry. Smaller secondary clusters appear in nanotechnology applications (B82Y), other metal compounds (C01G), coatings (C09D) and power-grid systems (H02J), each in a small minority of records. These smaller clusters point to narrower, less-claimed application areas rather than core competing chemistries.
High filing density in the core cathode-material claims, especially from the leading assignees, means that space is well occupied, but density is not the same as maturity — it means the obvious formulations are already claimed. Areas like coatings, grid-integration use cases and nanostructured variants show far fewer records, suggesting real room for differentiated claims there. Given the recent acceleration in filing through 2024, this is best treated as an active, still-forming field rather than a settled one.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.