Sodium-Ion Battery Scale-Up Patents: Leaders, Trends & White Space 2026
- Filing has plateaued, not accelerated. Annual filings rose from 4 in 2017 to a peak of 17 in 2024, but 2026 is already back down to 4 — a flat-to-declining trend once the partial current year is discounted.
- China dominates the filing venue. 80 of 108 families were filed at the China receiving office, versus single digits each for the EPO, the US, India, WIPO and Canada — scale-up IP is being staked out domestically first.
- Cathode and anode composite chemistry, not cell-line engineering, drives the claim volume. C01B and C01G inorganic-compound subclasses account for 46 of the non-H01M classifications, while manufacturing-adjacent classes like B82Y and C08K stay in single digits.
What this landscape covers
This dataset tracks patent families that combine sodium-ion battery chemistry claims with scale-up and manufacturing language — gigafactory production, electrode coating scale-up, dry-room-free manufacturing and mass production — inside the core cell-chemistry IPC classes H01M10/054, H01M4/1391 and H01M10/04. It captures the point where lab-scale sodium-ion chemistry meets the process engineering needed to build cells at volume.
The 108 families in the corpus run from 2015 through a partial 2026, with publication naturally lagging filing by roughly 18 months — so the most recent one or two years understate real filing activity. Read the trend as a shape, not a final count.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trend and technology composition
Two views of the same 108-family corpus: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
A peak already past
Filings climbed from 4 in 2017 to 10 at the 2022 midpoint and peaked at 17 in 2024, before falling back to 4 in 2026. That shape reads as a filing wave tied to a specific chemistry cycle rather than sustained compounding growth — treat 2025-2026 figures as provisional given publication lag, but the deceleration from the 2024 peak is already visible.
Chemistry claims outweigh process claims
Every record sits in H01M (batteries and cells), but the next-largest blocks are C01B (28 records) and C01G (18 records) — non-metallic and metal-compound chemistry, i.e. cathode and anode material composition. Manufacturing-adjacent classes such as B82Y (nanotechnology, 7) and C08K (polymer additives, 6) are comparatively thin, suggesting the patent activity is concentrated on what goes into the electrode rather than how the line runs.
Shares are the percentage of the 108 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 Scale-Up and Mass Production with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery scale-up and mass production and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art
Layered-oxide positive electrode active material for sodium-ion batteries (EP4235897A1)
This application provides a layered-oxide positive electrode active material and a positive electrode plate, a sodium-ion battery, and an electric apparatus containing the same. The claimed material is defined by a molecular formula covering a wide compositional window across manganese, iron, nickel and several optional doping elements, with numeric ratio constraints controlling the balance between them.Filed by Contemporary Amperex Technology (Hong Kong) Limited, published 2023-08-30.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN105609745A | 一种硒化镍/石墨烯钠离子电池复合负极材料及其制备方法与应用 | 36 |
| 2 | CN108336301A | 一种高性能钠离子电池负极及其制备方法 | 26 |
| 3 | CN105720251A | 一种钠离子电池硫化锑基复合材料及其制备方法 | 23 |
| 4 | CN105024056A | 一种钠离子电池铋/掺氮碳球负极复合材料及其制备方法 | 23 |
| 5 | CN110061229A | 一种高功率密度、长循环寿命的钠离子电池正极材料及其制备方法以及应用 | 22 |
| 6 | CN105702939A | 一种磷碳复合材料及其制备方法和应用 | 22 |
| 7 | CN107946591A | 一种钠离子电池高镍前驱体及其与正极材料的制备方法 | 21 |
| 8 | CN106025226A | 一种钠离子电池正极材料及其制备方法以及一种钠离子电池 | 21 |
| 9 | CN115893526A | 一种钠离子电池用镍铁锰层状氢氧化物前驱体、制备方法及应用 | 17 |
| 10 | CN109449417A | 一种磷酸铁钠复合正极材料及其制备方法和应用 | 17 |
Citation counts reflect activity inside this searched corpus and skew toward older filings; treat them as a signal of influence on later filers, 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.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the trend, geography and citation data that matter more than the raw counts on their own.
The filing wave has crested
Filings rose steadily through 2022 and peaked in 2024 before dropping sharply. Even allowing for an 18-month publication lag understating 2025-2026, the shape suggests the initial land-grab around sodium-ion cathode and anode chemistry is behind us, not ahead.
Domestic-first filing strategy
Nearly three-quarters of the corpus was filed in China, with the EPO, US, India, WIPO and Canada each in single digits. That imbalance means freedom-to-operate risk is concentrated in China first, and international counterpart coverage for many of these families may still be thin or absent.
Chemistry, not process, is the crowded zone
Cathode and anode material composition (C01B non-metallic compounds, C01G other-metal compounds) draws far more filing than manufacturing-specific classes. Composite anode and doped-cathode formulations are where prior art is densest; coating, drying and line-integration claims remain comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery scale-up and mass production, with the prior art for and against each one.
Who is filing, and where the gaps sit
The assignee ranking spans large Chinese battery and materials firms, university research institutes, and a long tail of single- or few-filing entrants — with recent-year momentum flat or negative across the most active names.
A broad, fragmented applicant base
No single assignee dominates the corpus outright; the ranking includes established battery manufacturers, university and national-institute labs, and numerous smaller materials-technology entrants filing only one or two families each.
Leading filers have gone quiet recently
Several of the most active historical assignees, including large Chinese universities and national research institutes, show zero filings in the latest tracked year and year-on-year declines. That is consistent with the overall 2024-to-2026 drop in the trend chart rather than any single firm's retreat.
Limited Western counterpart filing
The heavy tilt toward China filings means many assignees, including well-known battery makers, may hold domestic priority rights without corresponding EP or US family members yet on record.
| Assignee | Recent year | YoY |
|---|---|---|
| Shaanxi University of Science and Technology | 0 | — |
| Council of Scientific and Industrial Research | 0 | — |
| University of Science and Technology of China | 0 | -100% |
| Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 0 | — |
| 2D POLYMER BATTERIES LLC | 0 | — |
| Contemporary Amperex Technology Co., Ltd. (CATL) | 0 | — |
| Yanshan University | 0 | — |
| CIC Energigune Foundation | 0 | — |
Where to take this next
The landscape points to a maturing chemistry layer and a comparatively open manufacturing layer. Two directions follow from that.
Map freedom-to-operate against the China-heavy filing base
With 80 of 108 families filed in China, any scale-up programme targeting global markets should verify whether the dominant chemistry claims have EP, US or PCT counterparts before assuming a design is clear internationally.
Run a freedom-to-operate check in EurekaTarget claims in the thin manufacturing classes
B82Y and C08K filing volumes are a fraction of C01B and C01G, suggesting coating, drying and line-integration process claims are less contested than material composition claims.
Explore white space in EurekaCommon questions on sodium-ion scale-up patents
The ranking in this corpus is fragmented rather than dominated by a single company: it includes established battery and materials firms alongside Chinese university research institutes and national laboratories, plus a long tail of smaller entrants filing only one or two families. Several of the historically most active assignees show zero filings in the most recent tracked year, so current leadership by count does not necessarily reflect who is most active today. Anyone assessing this space should look at recent-year momentum alongside total family count, not total count alone.
Not on the evidence here. Filings rose from 4 in 2017 to a peak of 17 in 2024, then dropped back to 4 by 2026, which reads as a completed filing wave rather than sustained growth. Publication lag of roughly 18 months means the last one to two years are understated, so the true 2025-2026 count will rise somewhat as later publications land, but the decline from the 2024 peak is already a real signal worth planning around.
The IPC composition shows heavy concentration in cathode and anode material chemistry classes (C01B and C01G) and comparatively thin filing in manufacturing-process-adjacent classes such as B82Y nanotechnology and C08K polymer additives. That imbalance points to process-level claims — coating methods, dry-room-free processing, roll-to-roll line integration — as less crowded than new material composition claims. A freedom-to-operate search focused specifically on process claims, rather than chemistry claims, is likely to surface less prior art.
In this dataset, 80 of 108 families were filed at the China receiving office, compared to single digits each at the EPO, USPTO, India, WIPO and Canada. This reflects where sodium-ion supply chains and pilot-to-gigafactory build-out are currently concentrated, and it means the domestic Chinese filing base may substantially outpace international family coverage for the same inventions. Companies evaluating overseas risk should check priority dates and confirm whether EP, US or PCT counterparts exist rather than assuming filings are global by default.
EP4235897A1, filed by Contemporary Amperex Technology (Hong Kong) Limited and published 2023-08-30, claims a layered-oxide positive electrode active material for sodium-ion batteries defined by a specific molecular formula with numeric ratio constraints across manganese, iron, nickel and several optional doping elements. It also covers the positive electrode plate, the sodium-ion battery and the electric apparatus built from that material. The claim's numeric ranges are broad enough to cover a wide compositional window, which is what makes it relevant prior art for anyone drafting a new layered-oxide cathode composition claim in the same family of elements.
Research Sodium-Ion Battery Scale-Up and Mass Production in depth with Eureka
Go past this page: query the whole sodium-ion battery scale-up and mass production corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.