Li-Ion Cobalt-Free & Sodium-Ion Battery Patent Landscape
The cobalt-free lithium-ion and sodium-ion battery space is in a Growth phase, with a 27% rise in recent-window filings led by Honeycomb Battery Co ahead of Hydro-Québec and CATL entities. Activity is concentrated in cell and electrode chemistry (H01M), while adjacent material branches remain notably sparse.
Honeycomb Battery leads a moderately concentrated field with strong challenger depth
Honeycomb Battery Co holds the top position with 18 patent records, followed by Hydro-Québec Corp at 14 and Ningde Amperex Technology Ltd at 11, establishing a clear but not impenetrable lead tier.
The top five filers account for 26% of the combined output of the hundred largest filers — a moderate concentration level indicating that no single player has locked up the space, and that challengers from. China, North America, and. Europe are all active.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Honeycomb Battery Co | 18 | |
| 2 | Hydro-Québec Corp | 14 | |
| 3 | Ningde Amperex Technology Ltd | 11 | |
| 4 | Zhejiang Liwinon Energy Technology Co Ltd | 10 | |
| 5 | Colorado State University Research Foundation | 9 | |
| 6 | Contemporary Amperex Technology (Hong Kong) Limited | 8 | |
| 7 | SVOLT Energy Technology Co Ltd | 7 | |
| 8 | BYD Co Ltd | 6 | |
| 9 | Regents of the University of California | 6 | |
| 10 | Echion Technologies Ltd | 6 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Toyota Motor Corporation | 5 | |
| 12 | Phillips 66 Company | 5 | |
| 13 | Contemporary Amperex Technology Co Ltd | 5 | |
| 14 | BTR New Material Group Co Ltd | 4 | |
| 15 | Microsoft Technology Licensing LLC | 4 | |
| 16 | HRL Laboratories LLC | 4 | |
| 17 | Zhuhai CosMX Battery Co Ltd | 4 | |
| 18 | Southwest University | 3 | |
| 19 | Florida International University | 3 | |
| 20 | Carbon One New Energy Group Co Ltd | 3 |
The presence of both dedicated battery startups (Honeycomb Battery, Echion Technologies), large-scale manufacturers (BYD, CATL entities, SVOLT), and university research foundations (Colorado State, UC System) signals a field where academic innovation feeds rapidly into commercial development.
Filings from 2025 and 2026 are materially under-counted due to publication lag and should not be read as a slowdown; the underlying growth trajectory is best assessed through the 2020–2024 window. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Steady growth since 2020 anchored almost entirely in H01M cell and electrode chemistry
The annual filing chart tracks activity from 2017 to 2026, while the technology composition chart shows the IPC branch distribution across the corpus — together they reveal both the pace of expansion and where technical effort is concentrated.
Annual filing trend
Filings were broadly flat at 11–14 per year through 2018–2019, then stepped up noticeably from 2020 onward, reaching 28 in 2024 — the highest single-year count in the corpus. The 2025 and 2026 figures are incomplete due to patent publication lag and do not indicate a real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (Batteries, cells and fuel cells) dominates the composition overwhelmingly, reflecting deep focus on cell architecture, electrode active materials, and electrolytes. Non-metallic inorganic compounds (C01B) and compounds of other metals (C01G) are the next-largest branches, representing upstream precursor and cathode material chemistry, but at a fraction of H01M volume.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Three-dimensional structured plant-fiber carbon ma…
The present invention provides a three-dimensional structured plant-fiber carbon material for use as an anode material for a sodium-ion battery and a lithium-ion battery, and a preparation method thereof. The preparation method of the three-dimensional structured plant-fiber carbon material comprises: soaking the plant fiber into a pore forming agent, a… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 酚醛树脂基硬碳微球，其制备方法及负极材料和二次电池 | 50 |
| 2 | Battery with reference electrode for voltage monit… | 42 |
| 3 | Multi-level graphene-protected anode active materi… | 28 |
| 4 | Oxidation-reduction assisted exfoliation and reass… | 25 |
| 5 | 一种柔性自支撑MXene/锌复合电极及其制备方法和应用 | 21 |
| 6 | Partially and fully surface-enabled transition met… | 21 |
| 7 | Multi-level graphene-protected battery cathode act… | 20 |
| 8 | Three-dimensional structured plant-fiber carbon ma… | 20 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
The combination of a Growth lifecycle, moderate concentration, geographically diverse applicants, and sparse adjacent branches defines both the opportunity and the risk profile for new entrants and established players alike.
Growth stage: filings rising with no sign of saturation
The field is classified as Growth, with annual filing volume rising and recent-window growth at 27%. The 2024 peak of 28 annual filings represents the highest activity in the corpus. Because publication lag understates the most recent years, the true growth trajectory is likely stronger than visible data suggests. Teams entering now can still establish meaningful prior-art positions.
Growth · 27% recent upliftModerate: top five hold 26% of leading-filer output
The top five filers account for 26% of the combined output of the hundred largest filers, placing this field in a moderately concentrated tier — concentrated enough that the leaders have scale advantages, but open enough for challengers to build differentiated portfolios. Zhejiang Liwinon Energy Technology and Echion Technologies are the most active recent-entry challengers according to momentum data.
Top-5 share: 26%No co-filing partnerships detected in current evidence
The collaboration dataset returned no co-applicant pairs, suggesting that filers in this space predominantly file independently rather than through formal joint-development agreements visible at the patent level. This may reflect early-stage competitive sensitivity or the dominance of single-institution filings; deeper freedom-to-operate analysis may reveal informal ecosystem links not captured here.
Evidence pendingUS leads filings; China and Europe are substantial secondary markets
The United States is the primary filing jurisdiction with 74 patent records, followed by China at 43 and Europe (EPO) at 36. WIPO PCT filings at 22 indicate broad international protection strategies. India at 19 is a notable tertiary jurisdiction, suggesting growing local manufacturing interest. Canada at 6 likely reflects Hydro-Québec’s home-market filings.
Lead office: United StatesGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
Co-filing pairs, ranked by the number of jointly-filed patent families.
Honeycomb Battery and Hydro-Québec lead; CATL entities and Zhejiang Liwinon are the fastest-rising challengers
The two leading players approach the technology from distinct angles — one as a dedicated cobalt-free cell manufacturer, the other as an electrochemistry research institution — while a group of Chinese manufacturers and UK-based Echion Technologies are entering rapidly.
Honeycomb Battery Co
Honeycomb Battery Co (the international brand of SVOLT Energy Technology’s parent lineage) leads with 18 patent records, concentrated across H01M 4 (electrode active materials) and H01M 10 (secondary batteries). Momentum data is not separately tracked for the English-label entity in the evidence set; the related Chinese entity (Svolt Energy Technology Co Ltd) appears at 7 patent records in the ranking. Their focus on cell-level chemistry across both electrode and full-cell H01M subclasses indicates a vertically integrated IP strategy.
18 patent recordsHydro-Québec Corp
Hydro-Québec Corp holds 14 patent records, split evenly across H01M 10 and H01M 4 with a minor position in C01G 53 (compounds of other metals, relevant to cathode precursors). Its momentum shows a sharp recent decline (trend: –91%), suggesting the bulk of its portfolio was filed in prior periods and that new activity has slowed significantly — a contrast to the new-entrant Chinese manufacturers now accelerating into the space.
14 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Hydro-Québec Corp | 1 | ▼ -91% |
| Contemporary Amperex Technology Co Ltd (CATL) | 3 | ▲ new entrant |
| Ningde Amperex Technology Ltd (ATL) | 4 | ▲ new entrant |
| Colorado State University Research Foundation | 2 | ▲ new entrant |
| Zhejiang Liwinon Energy Technology Co Ltd | 8 | ▲ new entrant |
| Echion Technologies Ltd | 6 | ▲ new entrant |
| BYD Co Ltd | 2 | ▲ new entrant |
Inorganic precursor chemistry and nanotechnology are under-served adjacent branches
The dominant H01M classification captures cell-level innovation, but upstream material branches remain sparse relative to their technical relevance — representing areas where targeted filings could establish differentiated positions.
C01B · Non-metallic elements & inorganic compounds
With 15 patent records and a 5% share of classified filings, C01B covers non-metallic precursors including hard carbon, graphitic carbon, and phosphorus-based anodes — all directly relevant to sodium-ion anode design. The top-cited patent in the corpus (50 citations) relates to phenolic-resin-based hard carbon microspheres, signaling high technical value in this branch. An entrant with proprietary precursor synthesis routes could file here with relatively low prior-art density and strong commercial relevance to sodium-ion anode supply chains.
Search this in Eureka →B82Y · Nanotechnology applications
With only 4 patent records and a 1% share, the nanotechnology applications branch is notably sparse despite the clear relevance of nanostructured electrode materials — multilevel graphene-protected active materials appear among the most-cited patents in the corpus (28 and 20 citations respectively). This sparsity may reflect classification practice (nano-enabled batteries often indexed under H01M), but it also means that filings explicitly asserting nano-enablement claims in this class face limited prior art. Realistic entry requires nanomaterial synthesis capability, but the low filing density makes it an observable gap worth monitoring.
Search this in Eureka →Frequently asked questions
The corpus comprises 183 patent families in scope. Applicant rankings within this corpus are reported at the patent-record level, which can differ from family counts because a single family may cover multiple jurisdictions.
Honeycomb Battery Co leads with 18 patent records, ahead of Hydro-Québec Corp at 14 and Ningde Amperex Technology Ltd at 11. The top five filers together account for 26% of the combined output of the hundred largest filers.
The field is in a Growth stage. Annual filings rose from 11 in 2017 to a corpus peak of 28 in 2024, representing 27% growth in the recent window. The lower figures for 2025 and 2026 reflect patent publication lag and should not be interpreted as a real decline.
The United States is the primary filing jurisdiction at 74 patent records, followed by China at 43 and Europe (EPO) at 36. WIPO PCT filings total 22, and India — at 19 — is a notable tertiary jurisdiction reflecting growing regional manufacturing interest.
H01M (batteries, cells and fuel cells) dominates the corpus overwhelmingly, capturing cell architecture and electrode chemistry. The adjacent branches C01B (non-metallic inorganic compounds, 15 records), C01G (compounds of other metals, 13 records), and B82Y (nanotechnology, 4 records) are materially underrepresented relative to their technical relevance to sodium-ion and cobalt-free electrode development.
The current evidence set does not identify any co-applicant filing partnerships in this corpus. Filers appear to be operating independently at the patent level; cross-institutional collaboration, if present, is not surfaced through joint-filing records in this dataset.
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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.
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