Sodium-Ion Battery Formation Process Patents: Leaders & White Space 2026
- 87 families, no runaway leader. filings split across Chinese, US and European assignees with no single entity dominating the formation-process claim space.
- Filing peaked in 2022 at 17 families and has not exceeded that level since, suggesting the core process claims filed early are still being worked out rather than expanded.
- China receives more than a third of filings (31 of 87) with the US, Europe, India and PCT routes trailing well behind — a geography that should shape where you clear freedom-to-operate first.
What this landscape covers
This dataset tracks patent families that combine sodium-ion battery subject matter with formation-process language — SEI formation, aging protocols and formation protocols — classified under the core lithium/sodium cell IPC groups (H01M10/44, H01M10/054, H01M4/1391). It captures the specific step where a fresh cell is first charged and conditioned, not sodium-ion chemistry in general, so the 87 families here are a narrow, formation-specific slice of a much larger sodium-ion patent base.
Publication lags filing by roughly 18 months, so 2025 and 2026 figures in the trend chart are undercounted relative to what will eventually be on the register. Treat the most recent one to two years as a floor, not a ceiling.
Filing trend and technology composition
Annual filing counts and the IPC subclasses that formation-process patents most often sit alongside.
Filings rose to a 2022 peak and have not been exceeded since
Zero filings in 2017 gave way to a steady build to 17 families in 2022, the high point of the series to date. No later year has surpassed it, and the 2026 figure is partial, so the honest reading is a plateau rather than a decline.
Formation-process claims cluster tightly inside H01M
All 87 families sit in H01M (batteries, cells and fuel cells), with smaller but consistent overlap into inorganic-compound chemistry (C01B, C01G), powder metallurgy and alloys (B22F, C22C) used in electrode/additive preparation, and a thin tail into electrolytic metal production, measurement and capacitors.
Shares are the percentage of the 87 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Sodium-Ion Battery Formation Process with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery formation process and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited and most recent filings
EP4579787A2 — Positive electrode sheet for sodium-ion battery, sodium-ion battery and device (BYD)
The filing covers a positive electrode sheet with a sodium replenishment layer between the current collector and the positive coating, using a sodium-rich transition metal oxide replenishment agent alongside a gas-decomposable sacrificial sodium replenishment agent in the coating itself. The two-agent structure is aimed at offsetting sodium loss during formation and cycling.Abstract condensed from the original filing.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN114149319A | 一种有机补钠添加剂、正极极片以及在钠离子电池中的应用 | 22 |
| 2 | US20190355976A1 | Anodes for sodium-ion batteries | 16 |
| 3 | CN116072994A | 一种钠离子电池负极材料、负极极片的制备方法和钠离子电池 | 15 |
| 4 | US20160301097A1 | Ether-based electrolyte for na-ion battery anode | 13 |
| 5 | CN115663179A | 一种钠离子电池正极浆料、正极极片、电池、制备方法 | 12 |
| 6 | US20180190990A1 | Method for producing a positive electrode composite material for Na ion battery | 11 |
| 7 | US20180190987A1 | Method to synthesize Na-based electroactive materials | 10 |
| 8 | GB2588254A | Li/Na-ion battery anode materials | 9 |
| 9 | WO2016202871A1 | Method for producing a positive electrode composite material for na ion battery | 7 |
| 10 | EP3985775A1 | Electrolyte for na-ion battery | 6 |
Citation counts favour older filings that have had more time to accumulate references within this corpus; read them as a signal of influence, not current 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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Browse MCP servers →What the filing pattern tells you
Three read-throughs from the trend, geography and citation data.
Growth has flattened since the 2022 peak
The series climbs from zero in 2017 to 17 families in 2022 and has not exceeded that figure since. That pattern points to a first wave of core formation-process claims already staked out, with later filers narrowing into variants rather than opening new ground.
China is the primary filing venue by a wide margin
China accounts for 31 of the 87 families, more than the US (18) and Europe (13) combined. Any freedom-to-operate review for formation-process technology should start with the Chinese register before extending to other jurisdictions.
Claims reach beyond H01M into materials chemistry
Every family sits in H01M, but a meaningful share also touches inorganic compound chemistry and powder metallurgy/alloys classes, reflecting how formation-process claims frequently bundle in electrode-material or additive composition to broaden coverage.
Collaboration is limited and academic-leaning
Only five co-assignee pairs appear in the dataset, and the strongest recurring links involve a French research centre working with university partners rather than industrial co-developers, suggesting most formation-process filing here is done by single assignees.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery formation process, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| French National Centre for Scientific Research (CNRS) | Sorbonne University | 2 |
| French National Centre for Scientific Research (CNRS) | College de France | 2 |
| French National Centre for Scientific Research (CNRS) | Paul Sabatier University Toulouse III | 2 |
| Sorbonne University | College de France | 2 |
| Sorbonne University | Paul Sabatier University Toulouse III | 2 |
The densest co-filing relationships in this dataset are academic-institutional rather than cross-industry, which is unusual for a process technology this close to production.
Who is filing, and where the gaps sit
No assignee shows growth in the latest year, and momentum across the tracked filers is flat to negative — consistent with the plateau seen in the overall trend.
Recent-year filing has stalled across the leaderboard
Every assignee tracked for recent-year momentum shows zero filings in the latest year, including one entity down 100% year-on-year. Given the 18-month publication lag, some of this is reporting delay rather than a real stop, but the flat pattern across so many filers is notable.
A long tail sits behind a thin group of repeat filers
With 87 families spread across dozens of assignees and no dominant leader in the evidence, the field reads as fragmented rather than consolidated — closer to an emerging sub-niche than a settled technology owned by a handful of majors.
Filing strategy is regionally uneven
China, the US and Europe carry the bulk of filings, with India, PCT and the UK trailing. A filer targeting global coverage from a China-first filing base still has meaningful gaps to close in secondary markets.
| Assignee | Recent year | YoY |
|---|---|---|
| French National Centre for Scientific Research (CNRS) | 0 | — |
| Echion Technologies Ltd. | 0 | — |
| Faradion Limited | 0 | — |
| Tiamat SAS | 0 | — |
| INDIGENOUS ENERGY STORAGE TECH PVT LTD | 0 | — |
| Hong Kong Applied Science and Technology Research Institute (ASTRI) | 0 | -100% |
| Beian Energy Technology (Jiangsu) Co., Ltd. | 0 | -100% |
| Sorbonne University | 0 | — |
Where to take this
Two directions depending on whether you need a defensive read or a filing strategy.
Clear freedom-to-operate before scaling formation lines
With China holding over a third of the filings and citation leaders concentrated in electrode-additive and electrolyte claims, a formation-line rollout should check Chinese filings first, then the US and EPO families that cite most heavily within this set.
Run a freedom-to-operate check in Eureka →Target the under-claimed branches before they fill in
Sacrificial replenishment agents and formation-stage SEI aging protocols show thin filing density relative to the core H01M cluster. A first claim drafted now has more room to move than one filed against the denser 2022-vintage core.
Explore white space with Eureka →Common questions on this landscape
In this dataset, it is a patent family that combines sodium-ion battery subject matter with language specific to the formation step: SEI formation, aging process or formation protocol, classified under IPC groups H01M10/44, H01M10/054 or H01M4/1391. This excludes general sodium-ion chemistry patents that do not address the initial charge/conditioning step, so the 87 families here are a narrow, process-specific subset of the broader sodium-ion battery patent landscape.
No single assignee dominates this dataset; filings are spread across a mix of Chinese materials companies, a French public research centre and its university partners, and other individual filers, with all tracked assignees showing zero filings in the most recent year. That flat pattern, combined with a fragmented base of 87 families, means the field currently rewards careful freedom-to-operate checks against many small holders rather than negotiating with one or two majors.
Filing rose from zero in 2017 to a peak of 17 families in 2022 and has not exceeded that level in any year since, which reads as a plateau rather than continued growth. Because publication lags filing by roughly 18 months, the 2025 and 2026 figures are understated and should not be read as an actual decline until later data confirms it.
China receives the largest share, with 31 of the 87 tracked families, followed by the United States with 18 and the European Patent Office with 13. India, the PCT route and the United Kingdom account for smaller numbers, so a global clearance strategy should prioritise the Chinese and US registers before extending further.
The core H01M claim space around basic formation and SEI-forming steps is comparatively dense, but adjacent areas such as sacrificial sodium replenishment agents, gas-decomposable additive chemistries and in-situ formation impedance measurement show thinner filing density in this dataset. These branches are candidates for a first-mover claim, though a full novelty search against the broader sodium-ion corpus (beyond this formation-specific slice) is still necessary before drafting.
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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.