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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/sodium-ion-batteries-sodium-cell-formation-patent-landscape-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Sodium-Ion BatteriesSodium Cell Formation Patents: Who Holds the Claims and Where They're Still Open
155
Published Records
29%
Top-5 Share of All Records
+138%
Filing Growth 2021→2024
CN
Leading Jurisdiction
Filing growth compares 2021 (8 records) with 2024 (19) — 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 155 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··6 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks 155 published records at the intersection of sodium-ion chemistry and cell formation — the charging protocols, voltage sequencing and irreversible-loss management steps applied when a sodium cell is first cycled. The search combines formation-specific language with the core IPC subclass for non-aqueous electrolyte secondary cells, H01M10/054, so the scope is narrower than sodium-ion batteries as a whole: it isolates the formation-process layer rather than cathode or electrolyte material claims generally.
Coverage runs from 2015 through the data cut-off of 31 July 2026. Because publication typically lags filing by roughly 18 months, the 2025 and 2026 counts in the trend chart are still filling in and should not be read as a slowdown.
Filing activity and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape 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 trend and technology composition
Two views of the same 155 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in alongside the core battery classification.
Filing trend: growth concentrated in the early 2020s
Annual filings rose from 19 in 2017 to a peak of 23 in 2023, with the 2021-to-2024 span showing +138% growth (8 to 19 records). 2025 and 2026 counts are understated by publication lag and should not be read against the peak.
IPC composition: formation claims lean into measurement and EV integration
Every record carries the core H01M battery classification by design of the search. Beyond that, capacitors (H01G, 11.0% of the 155 records) and electric/magnetic measurement (G01R, 7.7%) are the next most common companions, followed by EV propulsion integration (B60L, 7.1%) — a signal that formation-protocol claims are frequently tied to measurement and vehicle-integration contexts rather than filed in isolation.
Shares are the percentage of the 155 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 Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape with Eureka
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A representative claim and the most-cited prior art
Representative Filing
Formation method for sodium ion cell or battery
SHARP KABUSHIKI KAISHA
The patent describes a two-phase charging protocol for sodium-ion cells built on a disordered-carbon anode and a nickel-containing sodium oxide cathode: a formation charge phase that deliberately drives the cell to a voltage at which sodium is irreversibly liberated from the cathode, followed by subsequent cycling at a lower voltage. The formation voltage is tuned so the sodium lost from the cathode during formation matches the sodium consumed in building the anode's surface layer, rather than being an incidental side effect.Filed by Sharp Kabushiki Kaisha, published 2018-08-02.
Most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20170062821A1 | Laser induced graphene materials and their use in electronic devices | 98 |
| 2 | WO2013154623A1 | Novel separators for electrochemical systems | 92 |
| 3 | US20070065714A1 | Electrochemical battery cell | 82 |
| 4 | US11145909B2 | Lithium metal electrodes and batteries thereof | 49 |
| 5 | CN110429329A | 一种全固态钠离子电池的制备方法及全固态钠离子电池 | 30 |
| 6 | CN106876781A | 钠离子电池及其制备方法 | 25 |
| 7 | JP2013510391A | ナトリウムイオン伝導性セラミックセパレーターを有する固体ナトリウム系二次電池 | 25 |
| 8 | US20200112026A1 | Laser induced graphene materials and their use in electronic devices | 16 |
| 9 | US20160126532A1 | Multi-electrode electrochemical cell and method of making the same | 14 |
| 10 | US9882196B2 | Multi-electrode electrochemical cell and method of making the same | 13 |
Citation counts favour older documents simply because they have had more time to be cited; treat this table as a map of influential prior art, not of current commercial 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.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape 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 patterns stand out once the records are grouped by assignee, geography and class — each has a direct bearing on where new claims are likely to clear and where they will run into dense prior art.
Concentration
29.0% of 155
held by the top 5 assignees
The top of the field is thin, not dominant
With 96 companies ranked across 155 records and the leader holding 15, no single assignee controls the space. The top 5 combined account for 29.0% of all records and the top 10 for 41.9% — meaningful clustering, but well short of the kind of concentration that would force a design-around on a handful of players.
Basis: assignee ranking, 155 records in scope.
Growth
+138%
2021 to 2024 filing growth
Activity accelerated sharply before 2025
Filings climbed from 8 records in 2021 to 19 in 2024, a +138% rise over three years, with 2023 marking the peak year at 23 records so far. That trajectory suggests formation-protocol claims moved from a niche interest to an active filing area within a short window, well before the most recent, still-incomplete years.
Basis: annual filing counts, 2021–2024.
Geography
57 vs 33 vs 19
China, US, EPO filings
China leads receiving offices by a wide margin
China received 57 of the tracked filings, ahead of the United States at 33 and the EPO at 19, with India, WIPO and Australia trailing further behind. A filing strategy built only around US and European coverage would miss the office that currently receives the largest share of this activity.
Basis: receiving-office counts across all records in scope.
Composition
11.0% H01G
capacitor-class overlap
Formation claims rarely stand alone
Beyond the core H01M classification every record carries by design, the next most common companion classes are capacitors (H01G, 11.0%), electric and magnetic measurement (G01R, 7.7%) and EV propulsion (B60L, 7.1%). That pattern points to formation protocols being claimed alongside measurement or vehicle-integration elements more often than as a standalone process.
Basis: IPC subclass shares against all 155 records; a record may carry multiple classes.
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Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion batteries: sodium cell formation patent landscape, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape 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 room below the top ranks and claim space still open in adjacent branches. The next steps depend on whether the goal is freedom-to-operate, portfolio benchmarking or identifying where to file.
Map freedom-to-operate against the leaders
Run the specific voltage-sequencing or charge-phase language you plan to claim against the top-ranked assignees' families, not just the most-cited records, since citation counts skew toward older filings.
Explore assignee portfolios in EurekaWatch the under-claimed branches
Capacitor and measurement-class overlaps sit well below the core battery classification's share, which is where a first claim is more likely to clear without stacking on dense prior art.
Search white space in EurekaTrack the next 12 months of filings
The 2025–2026 counts will keep rising as publication catches up with filing; re-check the trend before concluding the field has cooled.
Set a filing alert in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape 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 sodium cell formation patents
The ranking covers 96 companies across 155 records, and the field is a long tail rather than a single dominant player: the leader holds 15 records, and the top 5 assignees combined account for 29.0% of all 155 records in scope. The top 10 combined reach 41.9%, so meaningful activity extends well beyond the leading names into a broad set of single- and few-filing entrants. Anyone doing competitive tracking should watch beyond the top 5, since well over half the field's filings sit outside that group.
Filings grew from 8 records in 2021 to 19 in 2024, a documented increase of 138% over that three-year span, with the field's peak year so far at 23 records in 2023. Because publication lags filing by roughly 18 months, the 2025 and 2026 counts in any trend chart will look lower than they eventually turn out to be, so they should not be read as a decline. The 2021–2024 window is the most reliable basis for judging real growth.
China leads with 57 of the tracked filings, followed by the United States at 33 and the European Patent Office at 19. India, the WIPO PCT route and Australia follow at smaller volumes. A filing or clearance strategy focused only on US and European coverage would be working against a smaller share of the documented activity than one that also accounts for China.
US20180219248A1, filed by Sharp Kabushiki Kaisha and published 2018-08-02, covers a two-phase formation method for sodium-ion cells: a formation charge phase that deliberately drives the cell to a voltage where sodium is irreversibly liberated from a nickel-containing sodium oxide cathode, tuned to match the sodium consumed in forming the anode's surface layer, followed by subsequent cycling at a lower voltage. It does not block formation protocols built on different cathode or anode chemistries, nor does it claim measurement or EV-integration elements that often accompany formation claims elsewhere in this dataset. Anyone filing in this space should check their specific voltage-matching and material combination against this claim rather than assume the whole formation-protocol category is closed.
The clearest signal is in the companion IPC classes: outside the core H01M battery classification that every record carries by design, the largest overlaps are with capacitors (H01G, 11.0% of records) and electric/magnetic measurement (G01R, 7.7%), both well below H01M's share. That gap suggests formation-protocol claims combined with measurement, testing or capacitor-adjacent elements are less crowded than the core protocol claims themselves. Combined with a long tail of 96 companies rather than a dominant leader, there is room for new entrants to stake out specific chemistry-and-protocol combinations without immediately colliding with a small set of blocking patents.
Answers are grounded in the same dataset. Derived from a Patsnap search on Sodium-Ion Batteries: Sodium Cell Formation Patent Landscape 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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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.