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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/solid-state-sodium-battery-electrolytes-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape BriefSolid-State Sodium Battery Electrolyte Patents: Who Is Filing and Where the Claims Sit
- 41 patent families total, with filing peaking at 8 in 2024 after a flat 2022 midpoint of just 2 — growth here is uneven, not steady.
- China leads receiving offices with 11 filings, ahead of the EPO (7), the US (6) and the UK (4), spreading examination risk across several jurisdictions.
- Citation weight concentrates in NASICON claims, with WO2014052439A1 and its US counterpart drawing the two highest citation counts in the set.
41
Published Records
56%
Top-5 Share of All Records
+300%
3-Yr Growth (lag-adjusted)
CN
Leading Jurisdiction
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks 41 patent families filed against sodium solid electrolyte chemistries — NASICON, sodium beta-alumina and emerging chloride-based systems — where the claims center on ionic conductivity, interfacial resistance, sintering and grain boundary control. The search spans the 2015-2026 filing window, with the most recent year necessarily incomplete because publication lags filing by roughly 18 months.
Filing sits almost entirely within the H01M battery classification, with a substantial secondary cluster in C04B ceramics processing reflecting how much of the technical work is about sintering and densification rather than the electrolyte chemistry alone. Smaller pockets in non-metallic inorganic compounds and polymer classes mark the edges of the field where claim density is still thin.
Filing activity and IPC distribution, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Solid-State Sodium Battery Electrolytes 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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Filing Data
Filing trends and technology composition
The 41 patent families in this set span 2015 through the partial 2026 year, with filing activity concentrated in H01M battery-class subclasses and a secondary cluster in ceramics processing under C04B.
Filing trend: flat with a 2024 peak
Annual filings rose from zero in 2017 to a peak of 8 in 2024, but the 2022 midpoint of just 2 families shows growth has not been sustained year over year. Because publication typically lags filing by around 18 months, the 2025-2026 figures in this trend are understated and should not be read as a slowdown yet.
IPC composition: battery core plus ceramics processing
All 41 families sit in H01M (batteries, cells and fuel cells), with 12 also classified under C04B (ceramics, cement and refractories) — reflecting the sintering and grain-boundary processing steps central to solid electrolyte manufacture. Smaller counts in C01B, H01G, C01D, C01F, C01G and C08F mark thin, largely unclaimed adjacent branches.
Shares are the percentage of the 41 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 Solid-State Sodium Battery Electrolytes covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and most-cited prior art
Representative Recent Filing
Sodium-deficient chloride-based sodium solid electrolyte (US20260100411A1)
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
A sodium deficient solid electrolyte exhibits increased ionic conductivity relative to a non-sodium-deficient stoichiometric composition, achieved by ball milling a mixture of NaCl, YCl3 and ZrCl4 precursor powders with lower molar percentages of NaCl, resulting in reduced or no crystallinity and an increased concentration of sodium vacancies.Filed by The Regents of the University of California, published 2026-04-09 — one of the newest chloride-chemistry filings in this set.
Most-cited records in this landscape
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2014052439A1 | High conductivity nasicon electrolyte for room temperature solid- state sodium ion batteries | 26 |
| 2 | US20150249262A1 | High Conductivity NASICON Electrolyte for Room Temperature Solid-State Sodium Ion Batteries | 20 |
| 3 | EP0110712A2 | Sodium beta alumina electrolyte elements and their manufacture | 10 |
| 4 | US20230115956A1 | Chlorine-Based Sodium Solid Electrolyte | 6 |
| 5 | US4357399A | Alkali metal-sulfur cells | 6 |
| 6 | WO2021183944A1 | Chlorine-based sodium solid electrolyte | 5 |
| 7 | FR2397376A1 | Alkaline beta alumina mouldings for sodium-sulphur batteries - where mouldings are sintered in atmos. rich in… | 5 |
| 8 | JP1984141459A | Sodium beta alumina electrolytic elements and manufacture | 3 |
| 9 | US10276892B2 | High conductivity NASICON electrolyte for room temperature solid-state sodium ion batteries | 2 |
| 10 | EP2900594B1 | High conductivity nasicon electrolyte for room temperature solid- state sodium ion batteries | 2 |
Ranked by citation count within the searched corpus; older records accumulate citations by virtue of age, so treat this as a map of influence rather than a current leaderboard.
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 Solid-State Sodium Battery Electrolytes 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 citation and filing pattern signals
Reading citation counts and filing dates together separates chemistries that are settled from ones still being contested.
Citation Concentration
26 cites
top-cited family
NASICON claims anchor the field
WO2014052439A1 and its US equivalent hold the two highest citation counts in this dataset, meaning most subsequent NASICON filings had to cite or design around them. That concentration is a strong signal of occupied claim space in room-temperature NASICON compositions specifically.
Citation counts favor older records; treat this as influence, not current relevance.
Legacy Chemistry
10 cites
EP0110712A2
Beta-alumina is settled, not open
EP0110712A2, a sodium beta-alumina electrolyte patent, still draws citations decades after filing, consistent with a commercially deployed chemistry rather than an active filing frontier. Recent filing volume in this branch is thin.
Age plus steady citation is a marker of maturity, not fresh opportunity.
Filing Volume
8 in 2024
peak year
Growth is not sustained year over year
The trend climbs from zero in 2017 to 8 in 2024 but sits at just 2 at the 2022 midpoint, so this is a spiky pattern rather than compounding growth. Publication lag means 2025-2026 counts will likely rise once late filings post.
Read the most recent year as a floor, not a ceiling.
Jurisdiction Spread
11 filings
China
China leads but no office dominates
China's 11 filings lead the receiving-office count, but Europe, the US and the UK each carry meaningful shares (7, 6 and 4 respectively), so freedom-to-operate work needs to cover multiple regimes rather than one.
A single-jurisdiction clearance search will miss most of this landscape.
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 solid-state sodium battery electrolytes, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Solid-State Sodium Battery Electrolytes 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 what is still uncontested
The assignee base spans university research groups, a national lab and corporate filers, with no single organization showing sustained filing momentum in the most recent tracked year — a sign this field has not yet consolidated around a small set of incumbents.
Academic & Research
41 families
total in ranking
University and institute filers feature heavily
Organizations including university research groups and national research institutes appear across the assignee list, reflecting the field's continuing dependence on fundamental materials work in ionic conductivity and sodium-metal compatibility.
None of the tracked assignees show filings in the latest year, consistent with a research-stage field.
Legacy Corporate
1980s origin
EP0110712A2
Early corporate entrants set the beta-alumina baseline
Corporate filers from the early era of sodium battery development hold the foundational beta-alumina patents that still draw citations today, even though fresh filing in that specific chemistry has slowed.
Legacy holders are a citation source, not necessarily a current competitive threat.
Emerging Chemistry
2024 peak
8 families
Recent filers cluster around chloride electrolytes
The newest active filings, including the 2026 University of California family, concentrate on chloride-based sodium solid electrolytes — the branch most likely to see continued filing once 2025-2026 publication catches up.
Watch this branch for new entrants as lagged filings post.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Chloride Silent Power Limited | 0 | — |
| University of Maryland | 0 | — |
| The Regents of the University of California | 0 | — |
| Alcatel Alsthom Compagnie Generale d'Electricite | 0 | — |
| Indian Institute of Technology Kanpur | 0 | — |
| WE | 0 | — |
| Qilu University of Technology (Shandong Academy of Sciences) | 0 | -100% |
| Bell Laboratories | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Solid-State Sodium Battery Electrolytes 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
Next Steps
Where to take this analysis next
The filing and citation patterns here point to specific follow-up work depending on whether you are clearing a product design or scouting acquisition targets.
Check freedom-to-operate against the NASICON cluster
If your composition falls near room-temperature NASICON conductivity claims, the WO2014052439A1 family and its US counterpart are the two records to clear against first.
Run a claim comparisonTrack the chloride branch as 2025-2026 filings publish
Given the 18-month publication lag, chloride-chemistry filings from the last two years are still incomplete — set a watch on this branch rather than treating the current count as final.
Set up a filing alertScope a first claim in the thin IPC classes
C01D, C01F, C01G and C08F each carry only a single family here — draft and stress-test a claim before a better-resourced filer occupies that space.
Explore white spaceSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Solid-State Sodium Battery Electrolytes 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
Frequently asked questions
NASICON-type sodium electrolytes carry the strongest citation weight in this dataset, anchored by WO2014052439A1 and its US counterpart, which together are the two most-cited records found. Sodium beta-alumina is the older, commercially established chemistry, with its foundational patent dating to the early 1980s. Chloride-based sodium solid electrolytes are the newest active branch, with filing activity concentrated from 2023 onward, so NASICON leads on citation influence while chloride chemistries lead on recent filing momentum.
The assignee base in this 41-family dataset includes university and research-institute filers alongside corporate entities, with no single assignee showing sustained filing in the most recent year tracked. This points to a fragmented landscape rather than one dominated by a handful of established battery makers. Readers assessing competitive position should look at the full assignee ranking rather than assume incumbency, since recent-year momentum is flat across the named organizations in this data.
Filing activity is flat to declining on the annual trend, rising from zero in 2017 to a peak of 8 families in 2024 but showing only 2 families at the 2022 midpoint — that is not a smooth growth curve. Because patent publication lags filing by roughly 18 months, the apparent dip in 2025-2026 numbers is at least partly a data-lag artifact rather than a real slowdown. A clearer read on 2025-2026 activity will only be available once those cohorts finish publishing.
The thinnest IPC subclasses in this dataset — C01D, C01F, C01G and C08F — each show only a single patent family, compared with 41 in the core H01M battery class. That gap suggests hybrid inorganic-compound and polymer-composite approaches to sodium solid electrolytes are under-claimed relative to the crowded NASICON and beta-alumina core. Sintering-additive and grain-boundary engineering claims tied to those thinner classes are a more realistic entry point than filing directly against the dense NASICON citation cluster.
US20260100411A1, filed by The Regents of the University of California on 2026-04-09, claims a sodium-deficient chloride solid electrolyte made by ball-milling NaCl, YCl3 and ZrCl4 with reduced NaCl loading to raise sodium-vacancy concentration and conductivity. It sits on top of the broader chlorine-based sodium solid electrolyte prior art already established by US20230115956A1, so it narrows rather than forecloses the chloride branch. Companies developing chloride electrolytes should check whether their process uses understoichiometric NaCl for vacancy engineering specifically, since that is the feature this claim turns on.
Answers are grounded in the same dataset. Derived from a Patsnap search on Solid-State Sodium Battery Electrolytes 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.