Sodium-Ion Solid Electrolyte Patents: Who Leads, Where Gaps Are 2026
- Thin field, no runaway leader. Only 13 patent families match this claim scope, with filings clustered among Chinese universities and small specialty firms rather than a dominant incumbent.
- Filing has not built momentum. Activity peaked at 5 families in 2024 after a flat 2017-2022 stretch, and every tracked assignee shows zero filings in the latest year — early signal of a stalling wave, not a maturing one.
- Almost entirely a China filing story. 11 of 13 families route through the China receiving office versus 2 through India, meaning most prior art here is drafted and litigated under Chinese patent practice.
A narrow, early-stage claim space
Sodium-ion solid electrolyte patenting sits at the intersection of NASICON ceramics, sulfide glass electrolytes and polymer-hybrid membranes for sodium cells. The dataset behind this page captures 13 patent families filed between 2015 and mid-2026 that combine sodium-ion battery terminology with claims specifically directed at solid or NASICON-type electrolytes, filtered to the core battery IPC classes. That is a small corpus by the standards of adjacent lithium solid-state work, which tells its own story: this sub-field has not yet attracted the scale of filing that signals a settled technical consensus.
Composition skews heavily toward core electrochemistry: all 13 families sit in H01M, with smaller overlaps into inorganic compound chemistry (C01B, C01G), catalysis-adjacent processing (B01J), ceramics (C04B), polymer chemistry (C08F) and crystal growth (C30B). That spread suggests electrolyte formulation work is still being drafted primarily as a battery-cell invention rather than as a standalone materials-science filing, which affects how a freedom-to-operate search should be scoped.
Filing trend and technology composition
Two views of the same 13-family dataset: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend: flat with a late, small peak
Filings were at zero in 2017, sat at 1 by the 2022 midpoint, and peaked at 5 families in 2024 — the busiest year on record for this claim scope. The most recent year is necessarily undercounted because publication lags filing by roughly 18 months, but even accounting for that lag, the underlying trajectory across the tracked window is flat-to-declining rather than accelerating.
IPC composition: concentrated in H01M
All 13 families classify under H01M (batteries, cells and fuel cells), with secondary classifications touching inorganic chemistry, ceramics, polymer chemistry and crystal growth at one or two families each. The near-total concentration in a single primary subclass, with only thin secondary coverage, is itself a landscape signal: dedicated materials-science claims for sodium solid electrolytes are still rare relative to battery-cell-level claims that merely include an electrolyte limitation.
Shares are the percentage of the 13 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 Solid Electrolyte with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery solid electrolyte and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
CN116435585A — Sodium solid electrolyte and its preparation method and sodium-ion battery
Filed by Yibin Nanmu Nanotechnology in 2023, this family claims a NASICON-family sodium solid electrolyte with the general formula Na1+xMyZr2-y/4SixP3-xO12, doped with a low-valence cation (K, Ca, Ag, Cd, In or Sn) to raise ionic conductivity, plus a preparation method aimed at production-scale manufacture and the resulting sodium-ion battery.Doping strategy targets ionic conductivity gains without departing from the core NASICON stoichiometry.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN115000499A | 一种氟化物复合的固态电解质膜及其制备方法和应用其的固态钠电池 | 11 |
| 2 | CN119009078A | 一种夹层结构NASICON复合电解质的制备方法及其钠离子电池应用研究 | 2 |
| 3 | 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 |
| 4 | CN119890467A | 一种聚合物固态电解质及无负极固态钠电池的制备方法 | 1 |
Citation counts favor older filings simply because they have had more time to be cited within the searched corpus; treat them as a measure of influence on later drafting, not 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. Publication numbers are shown where the record carries one (4 of 4 rows); clicking a row searches Eureka by that number.
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Three readings of the same dataset: how much prior art actually exists, where it concentrates technically, and how the most-cited record shapes the drafting norm.
A genuinely thin corpus
With only 13 matching families across more than a decade of possible filing, this is not a crowded claim space. That makes individual filings disproportionately influential and makes a full-text novelty search far more tractable than in adjacent lithium solid-state electrolyte work.
Activity has not compounded
Every tracked assignee shows zero filings in the most recent year, including a -100% YoY drop for at least one named filer. Given the ~18-month publication lag, some of this is an artifact of the data cut-off, but the flat 2017-2022 stretch preceding the 2024 peak argues against reading this as a technology now accelerating.
A China-centric filing story
China accounts for the overwhelming majority of receiving-office filings, with India a distant second. Any competitive or freedom-to-operate review of this space should default to Chinese-language full-text search rather than relying on English-language abstracts alone.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery solid electrolyte, with the prior art for and against each one.
Who is filing, and how thin the field really is
No single assignee dominates this dataset. Filings are spread across Chinese universities, small specialty electrolyte firms and one Indian research institute, with none showing filing activity in the latest tracked year.
University and small-firm driven
The ranking is led by Chinese universities and small specialty firms rather than a battery major, which is unusual for a battery-electrolyte sub-field this far into the sodium-ion commercialization cycle. That points to the technology still being at the lab-to-pilot stage for solid electrolyte formulations specifically.
Momentum has stalled across the board
Every named assignee in the recent-momentum data shows zero filings in the latest year, and at least one shows a full year-over-year drop to zero. Watch whether this reflects a genuine pause or simply the publication lag catching up with 2025-2026 filings not yet public.
A two-country field
Beyond the Chinese-university cluster, an Indian Institute of Technology entry is the only non-Chinese assignee of note in this dataset, underscoring how narrowly this claim scope is currently being pursued outside China.
| Assignee | Recent year | YoY |
|---|---|---|
| Fuzhou University | 0 | — |
| Guangdong University of Technology | 0 | — |
| INDIAN INST OF TECHNOLGOY ROORKEE | 0 | — |
| Zhengzhou University | 0 | — |
| Langu (Changzhou) New Energy Co., Ltd. | 0 | — |
| Jiangsu Chuanyi Sodium-Ion Battery Research Institute Co., Ltd. | 0 | -100% |
| Chengdu Tanheli Technology Co., Ltd. | 0 | -100% |
| Yibin Nanmu Nanotechnology Co., Ltd. | 0 | — |
Where to take this analysis
This landscape is a starting point, not a conclusion. Three follow-ups turn it into a filing or freedom-to-operate decision.
Run a full-text novelty check in Chinese
With 11 of 13 families routed through China, an English-only search will miss most of the relevant prior art. A Chinese full-text search against the NASICON, sulfide-electrolyte and polymer-hybrid claim language is the next step before drafting.
Search full-text prior art in EurekaTrack the assignees showing zero recent filings
Several named assignees dropped to zero filings in the latest tracked year. Set an alert on their portfolios to see whether that is a genuine pause or a publication-lag artifact resolving over the next 18 months.
Set a portfolio alert in EurekaDraft into the identified white space
Anode-free architectures, sulfide-glass formulations and halide-blended PEO composites show thin direct coverage in this dataset. Each is a candidate for a cleanly claimable first filing rather than a crowded continuation fight.
Explore white space with EurekaCommon questions on sodium-ion solid electrolyte patents
This dataset identifies 13 patent families filed between 2015 and mid-2026 that specifically combine sodium-ion battery claim language with solid or NASICON-type electrolyte claims, restricted to the core battery IPC classes. That is a small number relative to lithium solid-state electrolyte patenting, reflecting how early-stage sodium-ion solid electrolyte technology still is. Because publication lags filing by roughly 18 months, the true count for 2025-2026 filings is likely somewhat higher than currently visible.
There is no single dominant assignee in this space. The filers are a mix of Chinese universities, small specialty electrolyte firms, and one Indian research institute, with no assignee showing more than a handful of families. This is a strong contrast to more mature battery sub-fields where a handful of majors hold most of the claim space, and it suggests the technology is still primarily at the research and pilot stage.
Based on this dataset, filing activity is flat to declining rather than accelerating. It stayed near zero through 2017-2022, peaked at 5 families in 2024, then dropped to zero across every tracked assignee in the most recent year. Some of that recent drop is likely a publication-lag artifact rather than a genuine pullback, but the multi-year stretch of low activity before the 2024 peak argues against reading this as a technology now taking off.
CN116435585A, filed by Yibin Nanmu Nanotechnology in 2023, claims a NASICON-family sodium solid electrolyte with the general formula Na1+xMyZr2-y/4SixP3-xO12, doped with a low-valence cation such as K, Ca, Ag, Cd, In or Sn to raise ionic conductivity, along with a specific preparation method and the resulting sodium-ion battery. Anyone drafting claims around low-valence cation doping of NASICON-type sodium electrolytes should review this family closely, as it is a directly on-point piece of prior art in a thin field.
Several adjacent branches show thin or no direct coverage in this dataset, including anode-free solid-state sodium cell architectures, sulfide-based sodium electrolyte glass formulations, halide-blended PEO composite electrolytes, and sandwich or interlayer NASICON composite structures. Given how few families exist overall, a well-drafted first claim in any of these branches has a reasonable chance of being genuinely novel rather than a crowded continuation. A freedom-to-operate search focused on Chinese full-text filings is still advisable before committing to a filing strategy.
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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.