Sodium-Ion Battery Additive Patents: Leaders & Filing Trends 2026
Filing growth compares 2021 (86 records) with 2024 (307) — 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 1,487 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent activity at the intersection of sodium-ion battery electrolytes and their additive chemistries, drawn from 1,487 published records classified under H01M10/054 and matched against sodium, electrolyte and additive terminology in title, abstract and claims. Sodium-ion cells are being pursued as a lower-cost, less supply-constrained alternative to lithium-ion, and the electrolyte additive is where much of the performance tuning happens — controlling solid-electrolyte-interphase formation, suppressing gas generation and extending cycle life. Because publication trails filing by roughly 18 months, the most recent one to two years in any trend understate real filing activity.
The scope here is intentionally narrow: additive-specific claims under the core sodium-ion cell classification, not the broader sodium-ion cell or cathode literature. That narrowness is useful for freedom-to-operate work, because it isolates the additive claim space from surrounding electrode and cell-format patents that a search on the general sodium-ion battery term would pull in.
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Filing trend and technology composition
Two views of the same 1,487 records: how filing volume moved year over year, and how those records distribute across IPC subclasses beyond the core battery classification.
A three-year surge, still climbing into 2024
Annual filings rose from 60 in 2017 to a peak of 307 in 2024, with the 2021-to-2024 span alone showing +257% growth (86 to 307). 2025 and 2026 figures (33 for 2026, which is only a partial year) will revise upward as later publications land — treat the recent taper as a reporting artefact, not a slowdown.
Additive claims lean chemical, not just electrochemical
Every record sits in H01M (batteries and cells) by definition of the search, but a meaningful share also carries capacitor classification H01G (5.0% of records) or inorganic and organometallic compound classes such as C01G (4.2%), C07F (3.2%) and C01B (2.0%) — evidence that additive innovation is being claimed jointly with the chemistry that makes the additive, not just the cell architecture it sits inside.
Shares are the percentage of the 1,487 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaA recent filing that shows where claim drafting is heading
Sodium-ion battery electrolyte and sodium-ion battery
The claim combines a defined additive package — fluoroethylene carbonate, 1,3-propane sultone and 1,3-propene sultone — with sodium difluorophosphate as a secondary sodium salt, and locks the relationship between them into a numeric ratio against total electrolyte mass. That ratio claim, rather than any single ingredient, is the part a competitor has to design around.Abstract excerpted from the published filing; ratio bounds simplified for readability.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060115579A1 | Novel composite cathodes, electrochemical cells comprising novel composite cathodes, and processes for fabric… | 148 |
| 2 | US20170104204A1 | Continuous process for producing electrodes and alkali metal batteries having ultra-high energy densities | 135 |
| 3 | US20170077546A1 | Alkali metal or Alkali-Ion batteries having high volumetric and gravimetric energy densities | 115 |
| 4 | US20170207484A1 | Alkali Metal-Sulfur Batteries Having High Volumetric and Gravimetric Energy Densities | 114 |
| 5 | US20170062821A1 | Laser induced graphene materials and their use in electronic devices | 98 |
| 6 | US20180241031A1 | Alkali Metal-Sulfur Secondary Battery Containing a Protected Sulfur Cathode and Manufacturing Method | 81 |
| 7 | US20180294475A1 | Alkali Metal-Sulfur Secondary Battery Containing a Polymer-Encapsulated Sulfur Cathode and Manufacturing Meth… | 74 |
| 8 | JP2013048077A | Additive for sodium ion secondary battery and sodium ion secondary battery | 65 |
| 9 | US20090162736A1 | Energy storage device and method | 57 |
| 10 | US20180138554A1 | Rechargeable Aluminum Ion Battery | 55 |
Citation counts favour older records simply because they have had more time to be cited — read them as a signal of technical influence within this corpus, not as a ranking of current commercial relevance.
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No single player controls the field
The leading assignee holds 73 records and the top five combined account for 17.4% of all 1,487 records in scope. That leaves the large majority of filings spread across a long tail — workable territory for a new entrant with a differentiated additive chemistry, provided the search covers the full ranked field rather than just the visible leaders.
The surge is recent and still under-reported
Annual filings climbed from 86 in 2021 to 307 in 2024. Because publication lags filing by about 18 months, the 2025-2026 figures shown in the trend chart will rise as more applications publish — this is a field still accelerating, not one that has peaked.
Filing activity is heavily China-weighted
China's receiving office carries 819 of the 1,487 records, well ahead of the United States (219), EPO (122) and WIPO/PCT (104). Prior art searches and freedom-to-operate work that skip Chinese-language filings will miss most of the field.
Additive claims cross into compound chemistry
Beyond the core H01M battery classification, notable shares of records also sit in C01G, C07F and C01B — inorganic and organometallic compound classes. Additive claims are frequently drafted alongside the chemical synthesis of the additive itself, which matters for anyone trying to define a clean claim boundary.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion batteries: sodium electrolyte additive patent landscape, with the prior art for and against each one.
Where to take this analysis
The landscape tells you what has already been claimed. The next step is testing a specific formulation or claim idea against it.
Stress-test a formulation idea
Run a candidate additive combination and ratio against the most-cited and most-recent filings in this set to see how close it sits to existing claim boundaries before drafting.
Explore in Patsnap EurekaTrack the ranked field over time
The assignee ranking will shift as 2025-2026 filings continue to publish; revisit the leader and long-tail split once those years are complete.
Set up monitoring in Patsnap EurekaMap the white space by IPC branch
Cross the C01G, C07F and C01B compound classes against additive claims to find combinations that are under-filed relative to the core battery classification.
Open the IPC breakdown in Patsnap EurekaQuestions practitioners ask about this field
This landscape identifies 1,487 published records classified under H01M10/054 and matched to sodium, electrolyte and additive terminology in the title, abstract or claims. That figure counts published patent documents rather than patent families in a de-duplicated sense, though the assignee ranking in this dataset is also expressed as 1,487 records. The count will keep rising for 2025 and 2026 as recently filed applications publish, since publication typically lags filing by around 18 months.
The field has a clear leader with 73 records, but no single company dominates: the top five assignees combined hold only 17.4% of the 1,487 records in scope, and the top ten hold 27.4%. That leaves a substantial long tail of single- or few-filing entrants, which is typical of a technology area that is still in an active build-out phase rather than one that has consolidated around a small number of incumbents.
Filings rose from 86 in 2021 to a peak of 307 in 2024, a +257% increase over that three-year span. This tracks the broader push toward sodium-ion cells as a cost- and supply-chain-motivated alternative to lithium-ion, with electrolyte additives being one of the fastest and cheapest ways to tune cycle life and safety without redesigning the cell architecture. Filing activity for 2025 and 2026 will look lower in the raw data purely because of publication lag, not because interest has cooled.
China's receiving office accounts for 819 of the 1,487 records, more than the United States (219), the European Patent Office (122) and the WIPO/PCT route (104) combined would not quite cover, though each is a meaningful secondary venue. Germany (33) and India (36) are smaller but present filing destinations. Any competitive or freedom-to-operate search in this space needs Chinese-language coverage to be considered complete.
The filing, from Shenzhen Capchem Technology, claims a sodium-ion electrolyte combining fluoroethylene carbonate, 1,3-propane sultone and 1,3-propene sultone as additives alongside sodium difluorophosphate as a secondary sodium salt, with the claim locked to a specific numeric ratio between the additive components and total electrolyte mass. It does not block the use of any single one of those ingredients on its own; the exposure is specifically around that combination held to the claimed ratio range. A design-around would typically vary the ratio outside the claimed bounds, substitute one additive in the combination, or use a different secondary sodium salt.
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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.