Sodium-Ion Battery Durability Patents: Leaders & White Space 2026
- 89 families total, with filing activity essentially flat from 2022 to the most recent partial year despite a peak of 38 in 2024.
- H01M dominates at 81 of 89 records, meaning almost every filing sits inside core battery/cell construction rather than adjacent materials or systems classes.
- Europe leads receiving offices with 32 filings, ahead of the United States (26) and China (16) — an unusual geographic skew for a sodium-ion sub-field.
What this landscape covers
This dataset tracks patent families that combine sodium-ion battery chemistry with explicit durability claims: wide-temperature operation, thermal cycling stability, or high-temperature stability. It is a narrow cut of the broader sodium-ion field, built to isolate environmental-robustness claims rather than energy density or cost work. The corpus runs from 2015 through a partial 2026 year, with 89 published families captured as of the July 2026 cut-off.
Filing activity was negligible before 2020, rose through the early 2020s, and peaked at 38 families in 2024 — the last full year in the window. Because publication typically lags filing by around 18 months, the 2025 and 2026 counts shown here are understated and should not be read as a decline yet.
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Filing trend and technology composition
Two views of the same 89 families: when they were filed, and which IPC subclasses they touch.
Filing trend is flat despite a recent peak
Filings climbed from zero in 2017 to a midpoint of 6 in 2022, then jumped to a peak of 38 in 2024. The 2022 midpoint against the 2024 peak shows growth concentrated in a short window rather than a steady climb — durability claiming is a recent phenomenon layered onto an already-established sodium-ion base, not a field that has been building for a decade.
H01M concentration signals a narrow claim style
81 of 89 records sit in H01M (batteries, cells & fuel cells), with only single-digit counts scattered across separation processes (B01D), condensation polymers (C08G), power/grid systems (H02J) and other metal-compound or EV-propulsion classes. Durability is being claimed almost entirely as cell-level chemistry and construction, not as separator materials, electrolyte additive chemistry, or pack-level thermal management — those adjacent classes remain thin.
Shares are the percentage of the 89 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 Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records in this corpus
Mono-crystalline Cathode Material for Sodium-ion Battery and Preparation Method and Application Thereof
The filing describes a mono-crystalline cathode material for sodium-ion batteries built on a doped Na-Ni-Mn-Fe oxide framework, with a wide window of dopant elements (including Ti, Zn, Co, Al, Zr and others) substituted into the transition-metal sites. The composition is defined by a broad stoichiometric range rather than a single fixed formula.Filed by Guizhou Zhenhua E-Chem Inc., published 2024-01-18.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2022038344A1 | membranes | 11 |
| 2 | US20240021807A1 | Mono-crystalline Cathode Material for Sodium-ion Battery and Preparation Method and Application Thereof | 5 |
| 3 | EP4451444A1 | Battery and electric apparatus | 5 |
| 4 | CN117186113A | 一种非水电解液添加剂及其应用 | 4 |
| 5 | WO2025165715A1 | Halide-based solid electrolytes and batteries, and methods of making and use thereof | 3 |
| 6 | US20240405322A1 | Battery and electrical apparatus | 3 |
| 7 | US20240405315A1 | Battery and electrical apparatus | 3 |
| 8 | CN119725816A | 钠离子电池的化成方法和钠离子电池 | 2 |
| 9 | CN115954463A | 钠离子电池层状氧化物复合材料及其制备方法、正极片和钠离子电池 | 2 |
| 10 | US20230302415A1 | membranes | 2 |
Citation counts inside this searched corpus favour older records and should be read as a signal of influence within the durability niche, 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.
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Three patterns stand out once the raw counts are read against filing dates and classification codes.
Growth arrived late and fast
The jump from a midpoint of 6 families in 2022 to 38 in 2024 shows durability-specific claiming is a recent addition to sodium-ion patent strategy, not a mature sub-field. Expect the 2025-2026 figures to revise upward as publications catch up.
Claims cluster inside the cell itself
Nearly every filing sits in core battery/cell construction. Separator chemistry, electrolyte additives and grid-scale thermal management each account for only a handful of records, leaving room for claims framed around those adjacent functions.
Europe outpaces the US and China
EPO filings (32) lead US filings (26) and China filings (16), an inversion of the geographic pattern typical of sodium-ion battery patenting overall. That suggests durability-specific claiming is being pursued more deliberately as a European filing strategy than as a volume play in China.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery environmental durability, with the prior art for and against each one.
Who is filing, and how concentrated is it
Recent-year momentum is thin across the board: no assignee in this dataset filed more than two families in the most recent year, and several show a full drop-off from the prior year.
Shenzhen and Xiamen Hicorn Energy Storage file jointly
The strongest co-assignee pair in the dataset links Shenzhen Hicorn Energy Storage Technology with Xiamen Hicorn Energy Storage Technology across 9 shared families, the clearest sign of a coordinated filing strategy across a single corporate group.
Momentum has cooled across leading filers
Ningde New Energy Technology (CATL New Energy) shows flat year-on-year filing at 2 in the latest year; Contemporary Amperex Technology filed 1. Several other named assignees, including Shenzhen Capchem and Hong Kong CATL New Energy, show -100% YoY, meaning no filings in the latest tracked year after activity in the prior one.
A small, still-forming field
With 89 total families and no assignee filing more than a handful in any single year, this remains a field without an entrenched leader. That leaves room for a new entrant with a distinct durability mechanism to establish a position quickly.
| Assignee | Recent year | YoY |
|---|---|---|
| Ningde New Energy Technology Co., Ltd. (CATL New Energy) | 2 | 0% |
| Contemporary Amperex Technology Co., Ltd. (CATL) | 1 | — |
| Shenzhen Hicorn Energy Storage Technology Co., Ltd. | 0 | — |
| Xiamen Hicorn Energy Storage Technology Co., Ltd. | 0 | — |
| Shenzhen Capchem Technology Co., Ltd. | 0 | -100% |
| Hong Kong CATL New Energy Technology Co., Ltd. | 0 | -100% |
| Hong Kong Hicorn Energy Storage Technology Co., Ltd. | 0 | — |
| University of Manchester | 0 | — |
Where to take this analysis
The landscape points to a field that is still forming its durability-specific claim map, with clear openings around the core H01M cluster.
Map the white space before filing
The IPC concentration in H01M leaves separator, electrolyte-additive and pack-thermal claims comparatively open. A freedom-to-operate check against the small existing set in those subclasses is faster now than it will be once filing volume catches up.
Explore white space in EurekaTrack momentum shifts, not just totals
Flat or negative year-on-year momentum among the leading assignees suggests filing strategy is shifting rather than simply growing. Watching which assignees resume filing after a pause is more informative than watching the raw total.
Set up assignee tracking in EurekaCommon questions on this landscape
This dataset identifies 89 patent families that combine sodium-ion battery chemistry with explicit durability claims such as wide-temperature operation, thermal cycling stability, or high-temperature stability, covering filings from 2015 through mid-2026. That is a narrow slice of the broader sodium-ion battery patent landscape, isolated specifically for environmental-durability claim language. Because recent filings take roughly 18 months to publish, the true count for 2025 and 2026 will be higher once those publications catch up.
The strongest coordinated filing activity in this dataset comes from a pair of related Chinese entities, Shenzhen Hicorn Energy Storage Technology and Xiamen Hicorn Energy Storage Technology, which co-file across nine shared families. Contemporary Amperex Technology (CATL) and its affiliate Ningde New Energy Technology also appear, though their most recent year of filing shows flat or declining momentum rather than acceleration. No single assignee holds a dominant share of the 89 total families, which makes this a fragmented rather than concentrated field.
The apparent drop after the 2024 peak of 38 families is very likely a publication-lag artifact rather than a real slowdown. Patent applications typically take about 18 months from filing to publication, so filings made in late 2024 through 2026 are still working through the pipeline and have not all appeared in the public record yet. Readers should treat the last one to two years of any patent filing trend as a floor, not a ceiling.
81 of the 89 records in this dataset are classified under H01M, the subclass covering batteries, cells and fuel cells, meaning most durability claims are written as cell-level chemistry or construction. Adjacent subclasses that would normally support durability — separation processes (B01D), condensation polymers (C08G) and power/grid systems (H02J) — each account for only a handful of records. That imbalance suggests separator materials, electrolyte additive formulations and pack-level thermal management are comparatively under-claimed relative to core cell chemistry.
The European Patent Office leads with 32 filings, ahead of the United States at 26 and China at 16, with smaller counts through India, the WIPO PCT route, and Austria. That ordering is notable because China typically dominates raw sodium-ion battery filing volume overall, so a European-led pattern specifically for durability claims suggests this niche is being pursued as a deliberate regional filing strategy rather than a byproduct of general sodium-ion volume.
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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.