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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/supercapacitor-electrolytes-and-voltage-window-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · SupercapacitorsSupercapacitor Electrolyte and Voltage Window Patents
- Filings peaked in 2017 at 204 and 2021-2024 volume fell 37%, from 128 to 81 — though 2025-2026 figures are still filling in due to publication lag.
- The top 5 assignees hold 20.4% of all 2,210 records in scope, with a long tail of single- and few-filing entrants behind them.
- H01M battery classes dominate at 67.6% of records, meaning most electrolyte innovation is being claimed and filed as battery-adjacent, not capacitor-specific, technology.
2,210
Published Records
20%
Top-5 Share of All Records
-37%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (128 records) with 2024 (81) — 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 2,210 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent activity around supercapacitor electrolytes and operating voltage windows — the chemistry and formulation choices that determine how much energy a device can store and how it behaves at temperature extremes. The search spans ionic liquid electrolytes, acetonitrile alternatives, water content control and gas evolution management, alongside the electrochemical stability and low-temperature conductivity claims that define a usable voltage window.
The dataset covers 2,210 published records filed or published between 2015 and mid-2026, drawn from receiving offices led by the United States, WIPO's PCT route, and the EPO. Because publication typically lags filing by around 18 months, the most recent one to two years in any trend understate actual filing activity.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Data
Filing trends and technology composition
Two views of the same 2,210-record corpus: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend: a 2017 peak, then a real pullback
Filings hit 204 in 2017, the high point of the series. Comparing the last two complete years available, 2021 (128) to 2024 (81) shows a 37% decline — a genuine cooling in filing pace, not an artefact of publication lag, since both years are past the lag window. 2025 and 2026 figures will rise as later publications catch up, so they should not be read as confirming a continued drop.
IPC composition: capacitor claims sit inside a battery-dominated field
H01M (batteries, cells and fuel cells) appears on 67.6% of records and H01G (capacitors) on 28.4% — confirming that electrolyte and voltage-window claims are being filed predominantly as battery-related subject matter, with capacitor-specific claims a minority even within a supercapacitor-focused search. Smaller shares in C01B, C07D and B82Y point to inorganic compound, heterocyclic chemistry and nanotechnology angles layered onto the core electrolyte claims. Because records can carry multiple IPC codes, these shares sum to more than 100%.
Shares are the percentage of the 2,210 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Supercapacitor Electrolytes and Voltage Window with Eureka
This page is one run against one query. Ask Eureka your own question about supercapacitor electrolytes and voltage window and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative Filing
A recent filing that shows where claims are heading
Recently published
Spiro-based ionic liquid electrolyte for low temperature supercapacitors
10644137 CANADA INC.
The filing describes a method for fabricating a spiro-based ionic liquid electrolyte: synthesizing an intermediate spiro-based product, then applying an ionic exchange process to obtain an ionic liquid salt electrolyte intended for use in electrochemical energy-storage devices, specifically supercapacitors operating at low temperature.Filed by 10644137 Canada Inc., published 2026-03-19.
Most-cited records in this landscape
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160043384A1 | Graphene foam-protected anode active materials for lithium batteries | 362 |
| 2 | US20110200848A1 | High energy density redox flow device | 345 |
| 3 | US20140227548A1 | Nanoparticles, Compositions, Manufacture and Applications | 268 |
| 4 | US20130171502A1 | Hybrid electrode and surface-mediated cell-based super-hybrid energy storage device containing same | 263 |
| 5 | US20090246625A1 | High performance batteries with carbon nanomaterials and ionic liquids | 252 |
| 6 | US20130084474A1 | Electrochemical hydrogen-catalyst power system | 218 |
| 7 | US20090272946A1 | High performance carbon nanocomposites for ultracapacitors | 217 |
| 8 | US20110183180A1 | Flexible asymmetric electrochemical cells using nano graphene platelet as an electrode material | 207 |
| 9 | US20030230337A1 | Photovoltaic cells utilizing mesh electrodes | 204 |
| 10 | US20130224603A1 | Lithium-ion cell having a high-capacity anode and a high-capacity cathode | 202 |
Citation counts favour older records simply because they have had longer to accumulate citations within the searched corpus — treat them as a signal of influence, not current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three read-throughs of the same corpus, aimed at where to file, where to watch, and where the claim space is still open.
Concentration
20.4%
held by top 5 of 2,210 records
A moderate lead, not a lockout
The top 5 assignees combined account for 20.4% of all 2,210 records in scope, rising to 31.0% across the top 10. That leaves close to 70% of filing activity spread across a long tail of the ranked leaders and entities outside the ranking entirely — this is a field with recognisable leaders but no single assignee controlling the claim space.
Based on the full 100-company ranking returned by the dataset.
Filing momentum
-37%
2021 to 2024, complete years
Volume is down from a 2017 peak
Filing activity peaked at 204 records in 2017 and has since cooled; the 2021-2024 comparison shows a 37% drop in complete-year volume. This reads as a maturing claim space rather than an abandoned one — activity is still substantial, just past its highest point.
2025-2026 figures will revise upward as publication catches up.
Citation signal
362 citations
on the most-cited record
Influence sits with older graphene and flow-cell work
The most-cited records in this corpus, including graphene-foam anode and redox-flow-device filings, are older documents that have had more time to accumulate citations. Their prominence reflects citation age, not that ionic-liquid or voltage-window chemistry is settled — recent filings like the 2026 spiro-based electrolyte record have not yet had time to accrue citations at all.
Citation counts favour tenure in the corpus, not current relevance.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to supercapacitor electrolytes and voltage window, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the claim space still opens up
The ranking spans 100 companies counted across 2,210 records. A handful of names recur across co-assignee pairs, suggesting close-knit inventor teams rather than pure corporate consolidation.
Leader
153
records, top-ranked assignee
A clear leader, well ahead of fifth place
The leading assignee holds 153 records against 59 for the fifth-ranked assignee and 41 for tenth — a steep drop-off after the top position that flattens into a long tail beyond the top ten.
Counted in records across the full ranking.
Co-filing
75 shared records
strongest co-assignee pair
Inventor pairs anchor a chunk of the leader's output
The dataset records 10 co-assignee pairs, the strongest linking two individual inventors on 75 shared records, with two further pairs at 35 each involving the same trio of names. This points to a small, stable inventing team behind a meaningful share of the top assignee's filings.
Co-assignee pairs reflect shared inventorship on the same records.
Momentum
-80% YoY
single-filer example
Recent-year activity is thin even among named players
Several assignees in the ranking, including large research and electronics organisations, show zero or one filing in the latest year. This is consistent with the broader 2021-2024 pullback rather than any one company exiting the space.
Latest-year counts are the most exposed to publication lag.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| SUSTAINABLE ENERGY TECHNOLOGIES INC | 1 | -80% |
| Samsung Electronics Co., Ltd. | 1 | 0% |
| Nanotek Instruments, Inc. | 0 | — |
| The Regents of the University of California | 0 | — |
| ZHAMU ARUNA | 0 | — |
| JANG BOR Z | 0 | — |
| Konarka Technologies, Inc. | 0 | — |
| Battelle Memorial Institute | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to a field with an identifiable leader group, a cooling filing pace off a 2017 peak, and claim density concentrated in battery-adjacent IPC codes rather than capacitor-specific ones.
Map claims against the white space
Cross-reference the under-claimed sub-areas against your own formulation work before drafting, using the IPC composition breakdown to see which adjacent classes are lightly claimed.
Explore white space in EurekaTrack the leading assignees' recent activity
Recent-year momentum figures show most named leaders slowing, which is worth confirming against their non-patent activity before assuming disengagement.
Monitor assignees in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about this landscape
One assignee leads the ranked field with 153 records, well ahead of the fifth-ranked assignee at 59 and the tenth-ranked at 41. The top 5 assignees combined account for 20.4% of all 2,210 records in scope, and the top 10 account for 31.0%. That leaves the majority of filings spread across a long tail of smaller and single-filing entities, so no one company controls the claim space outright.
Filing peaked in 2017 at 204 records and has since declined; comparing the last two complete years, 2021 (128) and 2024 (81), shows a 37% drop. This is a genuine pullback rather than a data artefact, because both years are far enough back to have finished publishing. Figures for 2025 and 2026 will still revise upward as publications catch up, since publication typically lags filing by about 18 months.
Acetonitrile is the conventional high-conductivity solvent for supercapacitor electrolytes but carries flammability and toxicity concerns, which is why acetonitrile alternatives appear as a distinct search term in this landscape. Ionic liquid electrolytes are one of the main alternative routes claimed, valued for wider electrochemical stability windows and lower volatility, though often at the cost of conductivity at low temperature. The representative 2026 filing in this dataset, a spiro-based ionic liquid electrolyte aimed specifically at low-temperature performance, illustrates how recent claims are trying to close that conductivity gap.
H01M (batteries, cells and fuel cells) covers 67.6% of the 2,210 records in scope, and H01G (capacitors) covers 28.4%, showing that most electrolyte claims are filed under battery-related classification even in a supercapacitor-focused search. Smaller but notable shares sit in C01B (inorganic compounds, 7.3%), C07D (heterocyclic compounds, 5.3%) and B82Y (nanotechnology, 2.9%). Because a single record can carry several IPC codes, these percentages add up to more than 100% and should not be read as a strict breakdown of the whole field.
The technology composition data shows filing density concentrated in H01M and H01G, with comparatively lighter claiming around low-temperature ionic liquid conductivity additives, acetonitrile-free formulations, and gas evolution suppression chemistries. These sit adjacent to the dense core classes rather than outside the field entirely, which is what makes them accessible starting points for new claims. Confirming white space requires checking current filing activity in Eureka against the specific sub-claim you intend to draft, since density shifts as new records publish.
Answers are grounded in the same dataset. Derived from a Patsnap search on Supercapacitor Electrolytes and Voltage Window covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Research Supercapacitor Electrolytes and Voltage Window in depth with Eureka
Go past this page: query the whole supercapacitor electrolytes and voltage window corpus yourself, in your own scope.
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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.