Sodium-Ion Battery Electrolyte Patents: Who Leads, Where the Gaps Are 2026
- 23 families total, concentrated almost entirely in H01M with only trace overlap into fire-fighting (A62C) and organo-metallic chemistry (C07F) — this is a narrow, still-forming claim space.
- China filed 20 of 23 records, against 2 from the United States and 1 PCT filing, so freedom-to-operate analysis outside China currently has very little prior art to clear.
- Filings peaked at 7 in 2024 off a flat mid-decade base, and no single assignee shows sustained year-on-year growth — momentum has stalled across every tracked filer in the latest year.
A young, thinly-populated claim space
Sodium-ion electrolyte chemistry is drawing patent activity, but the volume is still small: 23 families cover everything from solvation-structure control to wide-temperature-range formulations and SEI composition. The search string ties electrolyte claims to specific technical hooks — solvation structure, aluminum current collector compatibility, SEI composition and safety — which narrows the corpus to records making concrete formulation or interface claims rather than broad sodium-ion battery filings.
Filing is heavily weighted to Chinese applicants and the Chinese patent office, with the United States and the PCT route contributing only a handful of records between them. That imbalance matters for anyone assessing where enforceable rights actually sit today, and for anyone deciding where a first filing would face the least prior art.
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Filing trend and technology composition
Publication counts below are drawn directly from the tracked corpus; because publication lags filing by roughly 18 months, the most recent year is understated and should not be read as a drop-off in real filing activity.
Flat-to-declining filing pace with a 2024 peak
Filings sat near zero through the late 2010s, rose to a midpoint of 1 in 2022, then peaked at 7 in 2024 — the closest thing to a filing wave this dataset shows — before tapering toward the partial current year. There is no multi-year upward trend to point to yet.
Almost entirely a battery-chemistry claim
H01M (batteries, cells and fuel cells) covers all 23 records, confirming this is squarely a battery-chemistry dataset. Small overlaps into A62C (fire-fighting, 2 records) and single records each in C01C and C07F point to safety-additive and organo-metallic salt work sitting at the edges of the core claim space rather than forming distinct sub-fields yet.
Shares are the percentage of the 23 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 Electrolytes with Eureka
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Try EurekaThe most-cited records and the newest filing
WO2026016605A1 — high-temperature sodium-ion electrolyte and high-safety sodium-ion battery
The filing describes a sodium-ion electrolyte using propylene carbonate as the sole non-aqueous organic solvent, combined with a sodium salt and three additives (FEC, HMDI, DTD) that form a defined solvation structure with sodium ions and the FSI anion. The claimed structure is said to produce a stable cathode-electrolyte interphase and solid-electrolyte interphase at the electrode surface, targeting the known weaknesses of short high-temperature cycle life, poor high-temperature storage stability and gas generation in sodium-ion cells.Filed by Lifun Technology Co., Ltd.; published 2026-01-22.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN111525129A | 一种基于镍普鲁士蓝正极材料的水系钠离子全电池及其制备方法与应用 | 25 |
| 2 | US20160036107A1 | Lithium-air battery with sodium salt as mediator | 18 |
| 3 | CN105811001A | 一种基于环丁砜的二元钠离子电解液及其制备方法 | 12 |
| 4 | US9343787B2 | Lithium-air battery with sodium salt as mediator | 11 |
| 5 | CN116581388A | 匹配磷酸钒钠正极和钠金属负极材料的钠离子电解液及电池 | 6 |
| 6 | CN110534808A | 一种用于可充锌电池的阻燃有机电解液及可充锌电池 | 4 |
| 7 | CN118782912A | 一种高温钠离子电解液及高安全钠离子电池 | 3 |
| 8 | CN118213615A | 宽温度范围准固态钠离子电解质制备方法及准固态钠电池 | 3 |
| 9 | CN118472382A | 一种添加复合阻燃剂的钠离子电解液及含其的钠离子电池 | 2 |
| 10 | CN117477025A | 预防热失控的钠离子电解液及制备方法、电池和用电装置 | 2 |
Citation counts reward older records that have had more time to be cited within this searched corpus — read them as a signal of influence on subsequent filings, not as a ranking 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.
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Browse MCP servers →What the numbers say about where this field stands
Three figures anchor the read on this dataset: the size of the corpus, the geographic skew, and the absence of sustained growth at the assignee level.
Still an early-stage claim space
With only 23 patent families across an 11-year window, no single sub-area is deeply occupied yet. This is a field where a well-drafted claim can still stake out genuinely open ground.
Enforcement and FTO analysis is a China story
China's receiving-office share dwarfs the United States (2) and the PCT route (1). Anyone planning to commercialise outside China faces very little domestic prior art to clear, but also very little precedent on how claims of this type are examined there.
A single peak year, not a trend
Filings moved from 0 in 2017 to a midpoint of 1 in 2022 before spiking to 7 in 2024. No tracked assignee shows positive year-on-year growth into the latest period, so the peak looks more like a cluster of independent filings than a sustained wave.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery electrolytes, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Hunan Sodium Fang New Energy Technology Co., Ltd. | Hunan Cube New Energy Technology Co., Ltd. | 1 |
| Shenzhen Pangu Sodium Battery Co., Ltd. | Wuxi Pangu New Energy Co., Ltd. | 1 |
| Zhejiang Vast Sodium Technology Co., Ltd. | Tianjin Vast Sodium Technology R&D Co., Ltd. | 1 |
Only 3 co-assignee pairs appear in the dataset, each linking two related entities under what looks like shared corporate structure rather than cross-company collaboration — there is little evidence yet of joint development between independent players.
A fragmented field with no dominant filer
Every tracked assignee shows zero or negative year-on-year movement in the latest period, which is consistent with a field of many small, single-digit filers rather than one led by an incumbent building a defensible position.
Hunan Sodium Fang New Energy Technology
Among the more active Chinese filers in this corpus, its filing pace has flattened to zero in the most recent tracked year, down 100% year-on-year from its prior activity.
Toyota Motor Engineering & Manufacturing North America
The presence of a major automotive OEM's North American engineering arm signals cross-industry interest in sodium-ion electrolyte chemistry beyond the Chinese battery-materials specialists that dominate the rest of the corpus.
Xi'an Jiaotong University
University-originated filings sit alongside corporate ones in this dataset, suggesting some of the underlying solvation-structure and SEI-composition work is still moving from lab-stage research toward commercial formulation.
| Assignee | Recent year | YoY |
|---|---|---|
| Hunan Sodium Fang New Energy Technology Co., Ltd. | 0 | -100% |
| Toyota Motor Engineering & Manufacturing North America, Inc. | 0 | — |
| Guizhou Weifang Energy New Materials Technology Co., Ltd. | 0 | — |
| Xi'an Jiaotong University | 0 | — |
| Suzhou Nagu New Materials Technology Co., Ltd. | 0 | — |
| Hunan Cube New Energy Technology Co., Ltd. | 0 | -100% |
| Hunan Fenlite New Energy Technology Co., Ltd. | 0 | — |
| Hubei Three Gorges Laboratory | 0 | — |
Where to take this analysis
The dataset points to a field that is still open on inventorship but tightly geographically concentrated. Two directions make sense from here.
Map claims against the under-claimed branches
Run a targeted search against the gate chips above — non-PC solvation structures, current-collector passivation, wide-temperature SEI work — to see which of them are genuinely unfiled versus simply under-represented in this search string.
Explore in EurekaTrack the 2024 filing cluster forward
Because publication lags filing, records from 2025 and 2026 are still arriving. Re-running this landscape in Eureka in six to twelve months will show whether the 2024 peak was a one-off or the start of a real wave.
Set up monitoring in EurekaCommon questions about sodium-ion electrolyte patents
This tracked dataset contains 23 patent families published between 2015 and mid-2026, built from a search focused on sodium-ion and sodium-salt electrolytes combined with technical hooks like solvation structure, wide temperature range, aluminum current collector compatibility, SEI composition and safety. That is a small corpus compared with mature battery-chemistry areas, reflecting that sodium-ion electrolyte work is still an early-stage filing category. The true current total is likely somewhat higher, since publication typically lags filing by around 18 months and the most recent year in any such dataset is understated.
China dominates by receiving office, with 20 of the 23 tracked records filed there, compared with 2 in the United States and 1 via the PCT international route. This concentration means most enforceable rights in this space currently sit under Chinese patent law, and it also means the domestic prior art landscape outside China is comparatively thin. Companies planning to commercialise sodium-ion electrolyte technology in Western markets should treat this as an opportunity for cleaner freedom-to-operate, not as evidence that the underlying technology is immature everywhere.
The trend is flat rather than clearly rising: filings moved from 0 in 2017 to a midpoint of just 1 in 2022, then jumped to a peak of 7 in 2024 before tapering in the partial current year. No assignee in the dataset shows positive year-on-year filing growth into the latest tracked period, and several show a 100% year-on-year decline from a small base. That pattern looks more like an isolated cluster of filings around 2024 than the start of a sustained growth curve, though the recency lag in publication data means the 2025-2026 picture is still incomplete.
The corpus is fragmented: no single assignee shows a large or growing filing count, and most of the named filers — including specialist Chinese battery-materials firms and at least one university — appear with only a handful of records each. A North American automotive engineering and manufacturing arm also appears, indicating that interest extends beyond dedicated battery-materials companies into automotive OEM research. Three co-assignee pairs exist, but each links closely related entities rather than independent companies collaborating, so there is little sign yet of cross-company joint development in this space.
Based on the IPC composition, coverage is almost entirely concentrated in H01M (battery cells and chemistry), with only marginal overlap into fire-fighting-related safety claims and organo-metallic salt chemistry. That leaves specific sub-areas — solvation structures built around solvents other than propylene carbonate, aluminum current-collector passivation additives, and wide-temperature-range SEI stabilizers — visibly thin in this corpus. A first, narrowly drafted claim in one of these branches would currently face very little direct prior art within this search scope, though a broader clearance search beyond this specific query is advisable before relying on that.
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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.