Vanadium Electrolyte Patents: Who Leads, Where the Gaps Are 2026
- Filings peaked in 2024 at 65, then fell back — a sign the field may be past its first filing wave rather than still accelerating.
- The top 5 assignees hold just 15.1% of all 496 records, and the top 10 combined reach only 25.4% — concentrated at the head, but with a long tail behind it.
- H01M dominates at 80.0% of records, while C25B electrolytic production and C22B metal extraction sit under 5% each — narrow bands of much lighter claim density.
Filing growth compares 2021 (24 records) with 2024 (65) — 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 496 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent activity naming vanadium electrolyte production, concentration, stability and management concepts — spanning preparation methods for vanadium electrolyte solutions, thermal precipitation limits, cross-mixing and capacity rebalancing, and impurity tolerance in vanadium redox flow battery systems. The dataset spans 2015-01-01 to 2026-07-31, with 496 published records in scope as of the 2026-07-31 cut-off.
Publication typically lags filing by around 18 months, so the most recent year of activity in any trend chart is understated by definition — 2026's low count reflects a partial year, not a collapse in interest.
Filing trend and technology composition
Two views of the same 496 records: how filing volume moved year over year, and how those records distribute across IPC subclasses.
A filing peak, then a pullback
Filings ran from 20 in 2017 to a peak of 65 in 2024, passing through 30 at the 2022 midpoint before declining toward the partial 2026 count of 3. The shape points to a flat-to-declining trend rather than sustained growth once the most recent, still-incomplete year is set aside.
H01M carries the bulk of the claim space
H01M batteries, cells and fuel cells accounts for 80.0% of the 496 records, dwarfing every other subclass. C01G compounds of other metals (8.3%), G01R measurement (4.4%) and H02J power/grid systems (4.4%) trail well behind, with C25B electrolytic production, C22B metal extraction, G01N testing and C01B inorganic compounds each under 5% — these lighter bands are where fewer claims compete for the same ground.
Shares are the percentage of the 496 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Vanadium Electrolyte Production and Management with Eureka
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Try EurekaThe most-cited prior art in this space
Method for preparing vanadium electrolyte for all-vanadium redox flow battery
The application discloses a method for preparing vanadium electrolyte for an all-vanadium redox flow battery: heating high-purity vanadium pentoxide and reducing it with a reducing gas to obtain a low-valence vanadium oxide, mixing that oxide with an activating agent and heating to obtain a vanadium-containing paste electrolyte, then adding water to dissolve the paste into vanadium electrolyte with an average vanadium valence between positive three and positive four.Filed by VRB Energy Inc., published 2023-07-20 as US20230231170A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20010028977A1 | High energy density vanadium electrolyte solutions, methods of preparation thereof and all-vanadium redox cel… | 220 |
| 2 | US6562514B1 | Stabilized vanadium electrolyte solutions for all-vanadium redox cells and batteries | 193 |
| 3 | US20030143456A1 | High energy density vanadium electrolyte solutions, methods of preparation thereof and all-vanadium redox cel… | 128 |
| 4 | US6468688B2 | High energy density vanadium electrolyte solutions, methods of preparation thereof and all-vanadium redox cel… | 122 |
| 5 | US7078123B2 | High energy density vanadium electrolyte solutions, methods of preparation thereof and all-vanadium redox cel… | 95 |
| 6 | JP2007188729A | Method of regenerating vanadium redox flow battery | 75 |
| 7 | US20040241552A1 | Vanadium redox battery electrolyte | 59 |
| 8 | US20120196188A1 | Aromatic polymer ion exchange membranes, its composite membrance, and its application in acidic electrolyte … | 56 |
| 9 | US20130252137A1 | Use of porous membrane and composite membrane thereof in redox flow energy storage battery | 52 |
| 10 | CN104037439A | 一种化学与电化学结合制钒液流电池电解液的方法 | 49 |
Citation counts inside a searched corpus favour older records by construction — treat them as a signal of influence on later filings, not as a measure of current commercial relevance.
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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Three patterns stand out once volume, concentration and technology mix are read together.
A head, not a wall
The top 5 assignees hold 75 records between them, 15.1% of all 496 in scope, and the top 10 reach 126, or 25.4%. That leaves roughly three-quarters of the field spread across the rest of the ranked leaders — enough concentration to know who to watch, not enough to call the space closed.
Past the peak
Filing volume rose from 20 in 2017 to a peak of 65 in 2024, then dropped sharply toward 2026's partial count of 3. Combined with several leading assignees showing 0 filings and -100% YoY in the latest tracked year, this reads as a cooling filing cycle rather than a market in early growth.
One subclass carries most of the weight
H01M batteries, cells and fuel cells appears in 80.0% of records, meaning most filers are anchoring claims in cell-level battery architecture rather than in the narrower production or refining steps. C25B electrolytic production and C22B metal extraction each sit near 4%, suggesting the upstream processing side is comparatively under-claimed.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to vanadium electrolyte production and management, with the prior art for and against each one.
Who is filing, and where the gaps sit
The leader holds 18 records against a fifth-place figure of 13 and a tenth-place figure of 8 — a gradual taper rather than a cliff, consistent with the 15.1% and 25.4% concentration figures.
A single leader, modest lead
The top assignee holds 18 records against 13 at fifth place and 8 at tenth — a real but not dominant lead, reinforcing that this is a field with a recognisable leader rather than a monopoly.
A few tight partnerships
Ten co-assignee pairs appear in the data, with the strongest pairings each reaching 10 joint records — evidence of sustained institutional partnerships between specific research and commercial entities rather than one-off co-filings.
Cooling among former leaders
Several previously active assignees show 0 filings in the latest tracked year, with year-over-year changes of -100% where prior-year activity existed. That pattern, layered on the 2024 peak-then-decline trend, points to consolidation or a pause among incumbents rather than continued acceleration.
| Assignee | Recent year | YoY |
|---|---|---|
| Dalian Rongke Power Co., Ltd. | 0 | -100% |
| Shanxi Guorun Energy Storage Technology Co., Ltd. | 0 | -100% |
| Unisearch Ltd. | 0 | — |
| Squirrel Holdings Ltd. | 0 | — |
| Hubei Zhongfan Energy Storage Technology Co., Ltd. | 0 | — |
| HydraRedox Technology Holdings Ltd. | 0 | — |
| VANADIUMCORP RESOURCES INC | 0 | — |
| Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 0 | — |
Where to take this next
The landscape points to a field with an identifiable but not dominant leader group, a cooling filing curve, and technology mix skewed heavily toward cell-level claims.
Check freedom to operate against the cited core
The most-cited records date back over a decade and still anchor citation chains in newer filings — any production or stabilization method should be checked against them before drafting claims.
Run a freedom-to-operate check in EurekaProbe the under-claimed processing bands
C25B electrolytic production and C22B metal extraction sit under 5% of records each, well below the H01M core — a narrower, less contested space for process-level claims.
Explore white space in EurekaTrack the assignees still filing after 2024's peak
With several former leaders at 0 filings in the latest year, watching who continues to file past the peak identifies which players see continued commercial upside.
Set up assignee monitoring in EurekaCommon questions on vanadium electrolyte patents
The tracked dataset contains 496 published records filed between 2015 and mid-2026, drawn from a search targeting vanadium electrolyte, vanadium redox flow battery and related electrolyte-state terms. Filing volume rose from 20 records in 2017 to a peak of 65 in 2024 before falling back sharply. Because publication lags filing by roughly 18 months, the low 2026 figure reflects an incomplete year rather than a sudden drop in activity.
The ranking covers 100 companies, with the top-ranked assignee holding 18 records, fifth place at 13, and tenth place at 8. The top 5 combined account for 15.1% of all 496 records in scope, and the top 10 combined reach 25.4% — a recognisable leadership group, but far from a closed field, since three-quarters of records sit outside the top 10. Several of the more active filers are Chinese energy storage firms alongside established vanadium redox flow battery specialists.
H01M, the batteries, cells and fuel cells subclass, appears in 80.0% of the 496 records, making it by far the dominant claim category. Behind it, C01G (compounds of other metals) covers 8.3%, while G01R electric and magnetic measurement and H02J power supply and grid systems each sit at 4.4%. Because a single record can carry multiple IPC classes, these shares are measured against the full 496-record total and do not sum to 100%.
The processing and production side of the value chain looks comparatively under-claimed: C25B electrolytic production of compounds sits at 4.0% of records and C22B metal extraction and refining at 3.8%, both well below the 80.0% carried by H01M cell-level claims. Specific technical gaps include thermal precipitation limit control, cross-mixing mitigation, capacity rebalancing methods, and impurity tolerance thresholds — all named in the underlying search terms but each covered by a comparatively small slice of the 496 records. These narrower bands are worth checking before assuming the space is fully occupied.
Not on the current data: filings rose from 20 in 2017 through a 2022 midpoint of 30 to a peak of 65 in 2024, then declined toward a partial count of 3 in 2026. Several previously active assignees show 0 filings in the most recent tracked year, with year-over-year changes of -100% where prior activity existed. Read together, this points to a filing cycle that has already peaked rather than one still in an early growth phase, though the most recent year is always understated by publication lag.
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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.