Fastest
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 →https://www.patsnap.com/resources/blog/rd-blog/sodium-ion-battery-interface-engineering-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Battery & Energy StorageSodium-Ion Battery Interface Engineering Patents
- 39 families total, with filings staying flat through the 2022 midpoint before a late surge to 18 in 2024 — this is a young, still-forming claim space, not a settled one.
- China dominates the filing venue, with 30 of the tracked applications, against just 3 each from India and the United States and a thin 2 through the PCT route.
- No single assignee shows sustained momentum, every top-cited organisation in the recent-year table sits at zero filings in the latest year — leadership here is still up for grabs.
39
Published Records
28%
Top-5 Share of All Records
+1700%
3-Yr Growth (lag-adjusted)
CN
Leading Jurisdiction
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
Sodium-ion battery interface engineering concerns the chemistry and structure of the solid-electrolyte interphase (SEI) and the electrode-electrolyte interface: additive packages, in-situ formed films, and surface coatings that control how a sodium-ion cell ages, self-discharges and cycles. This dataset pulls 39 patent families filed between 2015 and mid-2026 that combine sodium-ion battery terminology with SEI, interphase or interface-coating language, restricted to the core battery and electrode-material IPC classes.
The picture that emerges is concentrated technically but not yet organizationally: almost every record sits inside H01M, but no assignee has repeated its filing pace year over year. That combination points to a field where the chemistry approach is converging while the competitive roster is still being written.
Filing activity and IPC composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Sodium-Ion Battery Interface Engineering 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
Publication counts by year and by IPC subclass, drawn directly from the 39 tracked families. Because publication lags filing by roughly 18 months, the 2025-2026 bars understate real filing activity.
A flat decade, then a late spike
Filings sat near zero through 2017-2022 (the 2022 midpoint logged just 1 record), then rose sharply to a peak of 18 in 2024. The 2025 and 2026 counts will revise upward as later publications catch up, but the shape already shows this is a recent, concentrated wave rather than a steady build.
Concentrated in core battery classes, with thin diversification
All 39 records touch H01M (batteries, cells and fuel cells), and every other subclass — C01B, C01G, B01J and a handful of single-record classes spanning coatings, polymers and even fire safety and radiation measurement — appears only a few times each. The claim activity is almost entirely inside cell and electrode chemistry, not in adjacent processing or measurement disciplines.
Shares are the percentage of the 39 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 Battery Interface Engineering 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 Battery Interface Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery interface engineering and every answer comes back with the patent numbers behind it.
Try EurekaKey Patents
Representative and most-cited filings
Representative filing
WO2025020932A1 — Sodium-ion battery positive-electrode interface film and preparation method
HUANENG CLEAN ENERGY RESEARCH INSTITUTE
The application describes forming a positive-electrode interface film in situ by pre-discharging an assembled sodium-ion cell to the electrolyte's reduction potential and holding it at constant voltage, so the electrolyte reduces at the cathode surface and deposits an inorganic-containing film directly on the electrode. The resulting film is denser and less soluble than typical cathode-electrolyte interphases, stabilises transition-metal ions, and is reported to reduce structural and interfacial degradation over cycling — improving self-discharge, cycling performance and coulombic efficiency.Filed by Huaneng Clean Energy Research Institute; published 2025-01-30.
Most-cited records in this corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN114122513A | 一种功能电解液添加剂、电池电解液和钠离子电池 | 11 |
| 2 | US20230223597A1 | Capacity-compensation electrolyte additive, preparation method and application, electrolyte containing the sa… | 5 |
| 3 | CN119852566A | 一种无负极钠金属电池电解液及其制备方法和应用 | 3 |
| 4 | CN119725738A | 一种磺酰胺/磺酰胺酯类添加剂及其在钠离子电池电解液中的应用 | 2 |
| 5 | CN118448716A | 一种钠离子电池原位聚合准固态电解质材料及其制备方法 | 2 |
| 6 | CN118231771A | 一种卤化物共混PEO基电解质的制备工艺及其在固态钠电池中的应用 | 2 |
| 7 | CN116565326A | 电解液及其制备方法和钠离子电池 | 2 |
| 8 | CN114243113A | 一种高温电解液添加剂、电池电解液以及钠离子电池 | 2 |
| 9 | CN120511360A | 一种提升钠离子电池硬碳负极长循环能力的电解液及其制备方法、应用 | 1 |
| 10 | CN118589053A | 一种钠离子电池电解液及其制备方法与应用 | 1 |
Citation counts favour older records inside any searched corpus; treat them as a signal of influence within this dataset, not as a ranking of current technical 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 Battery Interface Engineering 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
Run it yourself
Put your own technology through the same analysis
Where to run it
For builders
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 →Insights
What the numbers mean for a filing decision
Three patterns in this dataset matter more than the raw family count when deciding where to file or partner.
Filing pace
18 in 2024
peak year
A single peak year, not a trend line
Filings held near zero from 2017 through the 2022 midpoint (just 1 family that year) before jumping to 18 in 2024. That shape looks less like organic technology maturation and more like a wave of near-simultaneous entrants reacting to the same commercial signal — likely sodium-ion's push toward grid-storage and low-cost EV cells.
Filing trend, 2015-2026
Geographic concentration
30 of 39
filed in China
Venue choice is not yet global
China accounts for 30 of the 39 tracked families, versus 3 each from India and the United States and only 2 through the PCT route. Filers seeking freedom to operate in Western markets should not assume Chinese priority filings have been backed by matching US or EPO coverage.
Receiving office breakdown
Assignee momentum
0 in latest year
for every top assignee
No repeat filer has kept pace
Every organisation shown in the recent-year momentum table — spanning universities, a research institute and specialty materials firms — recorded zero filings in the most recent year. Sustained multi-year filing programmes have not yet emerged, which leaves room for a new entrant to build a defensible position quickly.
Recent-year filing momentum
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 sodium-ion battery interface engineering, with the prior art for and against each one.
Co-filing is rare and mostly university-industry
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Zhengzhou University of Light Industry | Henan Yicheng New Energy Co., Ltd. | 1 |
| Zhengzhou University of Light Industry | Nanyang Tiancheng New Energy Technology Co., Ltd. | 1 |
| South China Normal University | Chizhou Jushi Chemical Co., Ltd. | 1 |
| South China Normal University | Guangdong Jushi Chemical Co., Ltd. | 1 |
| Ben'an Energy Technology (Jiangsu) Co., Ltd. | Taicang Zhongke Saino New Energy Technology Co., Ltd. | 1 |
Only 5 co-assignee pairs appear in the dataset, the strongest linking a university to a regional new-energy materials company — a pattern consistent with early-stage, lab-to-pilot collaboration rather than established joint-venture filing.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Sodium-Ion Battery Interface Engineering 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 gaps sit
The assignee table spans universities, a national research institute, and small and mid-sized materials companies, several with names indicating dedicated sodium-ion or new-energy materials focus. None shows a sustained multi-year filing programme in this dataset.
Research institutes
0 in latest year
momentum
Institutional filers lead by volume, not pace
Universities and public research institutes appear repeatedly among the tracked assignees, consistent with sodium-ion interface chemistry still being explored at the materials-science stage rather than locked into a small number of corporate filing programmes.
Assignee ranking
Specialty materials firms
5 co-assignee pairs
collaboration count
Small companies partner rather than file solo
Several regionally named new-energy materials companies appear as co-assignees alongside universities, suggesting technology transfer from academic labs into smaller commercial entities is an active route into this space.
Co-assignee pairs
Cross-border filers
3 US, 3 India, 1 EPO
outside China
Non-Chinese activity is thin and scattered
United States, India and European filings each register in single digits, with no clear repeat filer visible outside China in this dataset — an opening for filers who want first-mover claim coverage in those jurisdictions.
Receiving office breakdown
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Microsoft Technology Licensing, LLC | 0 | — |
| Zhengzhou University of Light Industry | 0 | — |
| Guangdong Highstar Sodium Star Technology Co., Ltd. | 0 | — |
| Tianjin CEC New Energy Research Institute Co., Ltd. | 0 | — |
| South China Normal University | 0 | — |
| INDIAN INST OF TECHNOLGOY ROORKEE | 0 | — |
| Guizhou University | 0 | -100% |
| Ben'an Energy Technology (Jiangsu) Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Sodium-Ion Battery Interface Engineering 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
This landscape identifies where filings cluster and where they do not. Turning that into a filing or freedom-to-operate decision requires going claim-by-claim.
Check freedom to operate against the most-cited filings
The five most-cited records, led by CN114122513A on functional electrolyte additives, set the boundaries other filers have had to design around. Read their independent claims before drafting a new additive or coating composition.
Explore claims in Eureka →Track the assignees with zero recent filings
A quiet assignee is not necessarily an inactive one — some may be filing under new entities or shifting to trade secret protection. Monitoring for renewed activity from the institutions in the momentum table is worth automating.
Set up monitoring in Eureka →Map the under-claimed branches to your own roadmap
Surface-coating and polymer-interphase sub-areas show thin IPC coverage relative to the core H01M cluster. If your technical roadmap touches these, an early claim may face less crowded prior art.
Run a white-space search in Eureka →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Sodium-Ion Battery Interface Engineering 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 on this landscape
It refers to inventions that control the chemistry and structure of the solid-electrolyte interphase (SEI) or the broader electrode-electrolyte interface in sodium-ion cells. In this dataset that includes electrolyte additives that form protective films, in-situ formed interface layers like the one in WO2025020932A1, and surface coatings applied to electrode particles before cell assembly. The unifying theme is managing how the electrode surface reacts with electrolyte over cycling, since that reaction governs self-discharge, coulombic efficiency and cycle life.
This landscape tracks 39 patent families published between 2015 and mid-2026 that match sodium-ion battery terminology combined with SEI, interphase or interface-coating language in the core battery IPC classes. That is a small, young corpus compared to broader sodium-ion or lithium-ion battery searches, reflecting how recently this specific interface-chemistry angle has attracted dedicated filing. Because publication lags filing by roughly 18 months, the true 2025-2026 count is understated in current data.
China is by far the leading filing venue in this dataset, accounting for 30 of the 39 tracked families. The United States and India each show 3 filings, Europe shows 1, and the PCT international route accounts for 2. This concentration means filers assessing freedom to operate in Western markets should not assume Chinese-origin inventions already have matching US or EPO family members; many may not have been extended beyond China at all.
No. The recent-year momentum data shows every tracked top assignee, including universities, a national research institute and specialty materials companies, recording zero filings in the most recent year. Filing activity peaked at 18 records in 2024 but that peak was not driven by one repeat filer building a sustained portfolio; it reflects several organisations filing around the same period without evidence yet of a multi-year programme. This makes the field more open to new entrants than a mature battery-technology segment would be.
The IPC composition shows almost all 39 records sit in H01M, the core battery-and-cell classification, while adjacent classes such as C23C (surface coating deposition), B01J (catalytic and physical processing) and C08G (condensation polymers) each appear only once or twice. That thin representation suggests coating-deposition methods and polymer-based interphase materials for sodium-ion cells are less crowded than core additive-chemistry claims, making them worth a closer prior-art check before drafting new claims in those directions.
Answers are grounded in the same dataset. Derived from a Patsnap search on Sodium-Ion Battery Interface Engineering 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 Sodium-Ion Battery Interface Engineering in depth with Eureka
Go past this page: query the whole sodium-ion battery interface engineering 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.