Li-Ion Thermal & Aging Durability Patent Landscape 2026
The field is in a confirmed growth phase, with CATL-affiliated entities collectively dominating a moderately concentrated landscape. The United States is the primary filing jurisdiction, and activity has accelerated markedly over the recent multi-year window.
CATL leads a moderately concentrated but multi-player arena
Contemporary Amperex Technology (Hong Kong) Limited holds the top position in the ranking, followed by Graphenix Development Inc and Shenzhen Capchem Tech. The top five filers account for 29% of the combined total of the hundred largest filers, signalling moderate concentration rather than monopolistic control.
A clear first tier exists — Contemporary Amperex Technology (Hong Kong) Limited, Graphenix Development Inc, and Shenzhen Capchem Tech each hold substantial positions — while the second tier, including Nissan Motor, Sila Nanotechnologies, and Ford Global Technologies, sits meaningfully behind. This tier gap gives the leaders some structural advantage but leaves room for challengers.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Contemporary Amperex Technology (Hong Kong) Limited | 60 | |
| 2 | Graphenix Development Inc | 37 | |
| 3 | Shenzhen Capchem Technology Co., Ltd. | 35 | |
| 4 | Contemporary Amperex Technology Co., Ltd. | 33 | |
| 5 | Nissan Motor Co., Ltd. | 23 | |
| 6 | Sila Nanotechnologies Inc | 23 | |
| 7 | Ford Global Technologies LLC | 23 | |
| 8 | Zhuhai CosMX Battery Co., Ltd. | 18 | |
| 9 | Ningde Amperex Technology Ltd. | 16 | |
| 10 | A123 Systems LLC | 15 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | GM Global Technology Operations LLC | 13 | |
| 12 | Beijing Easpring Material Technology Co., Ltd. | 13 | |
| 13 | Zhejiang Liwinon Energy Technology Co., Ltd. | 12 | |
| 14 | Ethium LLC | 12 | |
| 15 | Piersica Inc | 10 | |
| 16 | Hydro-Québec | 10 | |
| 17 | Northwestern University | 10 | |
| 18 | Guangzhou Tinci Materials Technology Co., Ltd. | 8 | |
| 19 | Sanyo Chemical Industries, Ltd. | 8 | |
| 20 | AESC Japan Ltd. | 8 |
The CATL group’s split across Contemporary Amperex Technology (Hong Kong) Limited, Contemporary Amperex Technology Co Ltd, and Ningde Amperex Technology Ltd suggests a deliberate multi-entity filing strategy, consolidating IP in different holding vehicles. For competitors, this creates a dense cluster of related prior art that must be navigated carefully.
Filings from approximately the last 18–24 months are likely under-counted due to standard patent-publication lag; the most recent period should be interpreted as a lower bound. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Sustained growth and overwhelming H01M concentration, with niche adjacencies emerging
The annual filing trend reveals a field that has grown substantially since 2017, while the technology composition chart shows that H01M (batteries, cells, and fuel cells) is the dominant class by a wide margin, with a handful of adjacent branches representing smaller but potentially differentiated footholds.
Annual filing trend
Filings climbed from 19 in 2017 to a recorded peak of 114 in 2024, with 2025 and 2026 figures understated by publication lag and not indicative of a real decline. The multi-year growth rate stands at 46% on a recent-window basis, consistent with the field’s confirmed Growth lifecycle stage.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M dominates the technology mix overwhelmingly. Secondary branches — including C01B (non-metallic elements and inorganic compounds), C01G (compounds of other metals), and B60L (electric vehicle propulsion) — each represent small shares, suggesting that materials chemistry and EV integration remain under-developed relative to core cell-level work.
↗ 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.
Non-aqueous electrolyte for lithium-ion battery, a…
A non-aqueous electrolyte of a lithium-ion battery and a lithium-ion battery. The non-aqueous electrolyte of the lithium-ion battery comprises a non-aqueous organic solvent, a lithium salt, and an additive. The additive comprises unsaturated phosphate as illustrated in the following structural formula (A) and lithium difluorophosphate, wherein in formula… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Lithium-ion battery including two power supplies | 122 |
| 2 | Lithium-Ion Battery And Method For Its Manufacture | 87 |
| 3 | Sulfide-Based Solid Electrolyte for Lithium Ion Ce… | 83 |
| 4 | Modular lithium-ion battery system for fork lifts | 77 |
| 5 | 一种动力与储能锂离子电池及其制备方法 | 77 |
| 6 | Phase separated silicon-tin composite as negative … | 76 |
| 7 | Secondary cell having a lithium intercolating mang… | 71 |
| 8 | Lithium-ion battery and method for its manufacture | 56 |
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 competitive structure means for R&D investment decisions
Four structural observations — maturity, concentration, collaboration, and geography — help an R&D team prioritise where to enter, partner, or differentiate.
Growth stage: annual volume still rising, lag caveat applies to recent years
The lifecycle evidence positions this field firmly in Growth, with annual filings still rising and the 46% recent-window growth rate confirming broad momentum. The 2025–2026 dip in recorded filings is an artefact of publication lag, not a market signal. Teams entering now face an active but not yet crowded prior-art base compared with fully mature fields.
Growth stageModerate concentration: dominant leader, reachable second tier
The top five filers hold 29% of the hundred largest filers’ combined total — a moderate figure that indicates neither an open field nor an entrenched duopoly. The gap between the first-ranked entity (60 patent families) and the fifth-ranked entities (23 patent families each) is substantial, but second-tier positions held by Graphenix Development, Shenzhen Capchem Tech, and Nissan Motor show that challengers can accumulate meaningful portfolios.
Moderate HHINissan–Sanyo Chemical and Sila–Georgia Tech are the active co-filing pairs
The most active co-applicant relationship is between Nissan Motor and Sanyo Chemical Industries, with four jointly filed patent families, indicating a materials-supply chain partnership focused on electrolyte or binder chemistry. Sila Nanotechnologies has filed jointly with Georgia Tech Research Corporation (2 families) and Battelle Memorial Institute (1 family), pointing to university and national-lab validation pathways for its silicon-anode durability technology. No other multi-party collaborations appear in the evidence.
Industry-academia linksUS-led filing strategy, EPO second, China notably low
The United States is the primary filing jurisdiction, followed by Europe (EPO) and India. China appears with a comparatively small count despite Chinese entities dominating the applicant ranking — suggesting that the leading Chinese filers are pursuing protection primarily in export markets rather than domestically. India’s presence in the top three jurisdictions is noteworthy for a field this size and may reflect both generic-manufacturing risk hedging and emerging local demand.
US–EPO–India axisGo 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.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Nissan Motor Co., Ltd. | Sanyo Chemical Industries, Ltd. | 4 |
| Sila Nanotechnologies Inc | Georgia Tech Research Corporation | 2 |
| Sila Nanotechnologies Inc | Battelle Memorial Institute | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
CATL group dominates; Graphenix and Sila lead the challenger tier
The top two players exemplify contrasting strategies: a large integrated battery manufacturer scaling across all H01M sub-classes versus a focused materials startup deepening electrode chemistry IP with strong recent momentum.
Contemporary Amperex Technology (Hong Kong) Limited
The top-ranked entity holds 60 patent families, with technology emphasis concentrated in H01M 10 (cell-level battery systems) and H01M 4 (electrode materials). The CATL group entity Contemporary Amperex Technology Co Ltd adds a further 33 patent families in essentially the same technical space, and Ningde Amperex Technology Ltd contributes 16 more. The parent entity’s recent filing momentum is up 56%, confirming that this lead position is being actively extended rather than maintained passively.
families: 60Graphenix Development Inc
Graphenix Development holds 37 patent families — the second-highest count — with a near-equal split between H01M 10 and H01M 4, and a small but notable presence in H01G 11 (capacitors), suggesting exploration of hybrid energy-storage durability. Recent filing momentum is up 18%, indicating steady portfolio expansion. As a focused development company rather than a vertically integrated manufacturer, Graphenix represents a licensing or partnership target for OEMs seeking electrode-durability IP.
families: 37| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | 42 | ▲ +56% |
| Graphenix Development Inc | 20 | ▲ +18% |
| Shenzhen Capchem Technology Co., Ltd. | 6 | ▲ new entrant |
| Ford Global Technologies LLC | 19 | ▲ new entrant |
| Sila Nanotechnologies Inc | 18 | ▲ new entrant |
| Zhuhai CosMX Battery Co., Ltd. | 6 | ▼ -45% |
| Ningde Amperex Technology Ltd. | 4 | ▲ new entrant |
| Nissan North America, Inc. | 4 | ▲ new entrant |
Under-served adjacent branches worth monitoring
Outside the dominant H01M core, several IPC branches carry comparatively low patent-record counts relative to their technical relevance to durability. These are observations of relative sparsity — not validated commercial opportunities — but two carry plausible entry rationale.
C01B · Non-metallic elements & inorganic compounds
With 43 patent records, C01B represents the largest adjacent branch but still a small share of the overall corpus. This branch covers inorganic compounds relevant to separator coatings, solid-electrolyte precursors, and surface-passivation agents — all of which directly affect thermal and aging performance. The sparsity relative to H01M suggests that materials-chemistry innovations upstream of the cell are not yet heavily contested; an entrant with expertise in inorganic synthesis could position here before crowding intensifies.
Search this in Eureka →H02J · Power supply & grid systems
H02J appears with 21 patent records, reflecting the intersection of cell-level durability with system-level charging and grid-management protocols. Thermal aging is strongly influenced by charge/discharge management, yet this systems-level angle remains sparsely covered in the corpus. An entrant combining battery-management-system IP with durability modelling — bridging H01M and H02J — would occupy a currently thin niche, particularly relevant for stationary storage and fast-charging infrastructure.
Search this in Eureka →How leaders differ by technology route across IPC sub-classes
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 10 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | H01M 50 · Batteries, cells & fuel cells | H01M 2 · Batteries, cells & fuel cells | C01B 25 · Non-metallic elements & inorganic compounds |
|---|---|---|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | Strong · 82 | Strong · 43 | Emerging · 8 | Absent | Emerging · 2 |
| Graphenix Development Inc | Strong · 37 | Strong · 34 | Absent | Absent | Absent |
| Shenzhen Capchem Technology Co., Ltd. | Strong · 34 | Moderate · 12 | Absent | Absent | Absent |
| Ford Global Technologies LLC | Strong · 23 | Strong · 15 | Moderate · 7 | Absent | Absent |
| Sila Nanotechnologies Inc | Strong · 23 | Strong · 12 | Moderate · 5 | Absent | Absent |
| Zhuhai CosMX Battery Co., Ltd. | Strong · 18 | Strong · 16 | Absent | Absent | Absent |
| A123 Systems LLC | Strong · 15 | Absent | Moderate · 7 | Moderate · 6 | Emerging · 3 |
Frequently asked questions
Contemporary Amperex Technology (Hong Kong) Limited leads with 60 patent families, ahead of Graphenix Development Inc at 37 and Shenzhen Capchem Tech at 35. The broader CATL group — including Contemporary Amperex Technology Co Ltd and Ningde Amperex Technology Ltd — collectively accounts for over 100 patent families across its affiliated entities.
Yes. The lifecycle evidence classifies this field as Growth, with annual filings rising from 19 in 2017 to a recorded peak of 114 in 2024 and a recent-window growth rate of 46%. The lower figures for 2025 and 2026 reflect standard patent-publication lag and should not be read as a slowdown.
The United States is the primary jurisdiction, followed by Europe (EPO) and India. China carries a comparatively small count despite Chinese entities dominating the applicant ranking, suggesting that leading Chinese filers focus protection in export markets. India’s prominence is notable and may reflect both manufacturing-risk hedging and local market growth.
H01M (batteries, cells, and fuel cells) is by far the dominant IPC class. Secondary branches such as C01B (non-metallic elements and inorganic compounds) and C01G (compounds of other metals) account for much smaller shares, indicating that core cell-level engineering is where the bulk of IP activity is concentrated.
The most active co-filing relationship is Nissan Motor and Sanyo Chemical Industries with four jointly filed patent families, indicating a materials-supply partnership. Sila Nanotechnologies has also co-filed with Georgia Tech Research Corporation and Battelle Memorial Institute, reflecting a startup-plus-national-lab validation model. No other multi-party co-filing clusters appear in the evidence.
C01B (non-metallic elements and inorganic compounds) and H02J (power supply and grid systems) are the largest adjacent branches with comparatively low patent-record counts. C01B covers inorganic materials relevant to separator coatings and solid-electrolyte precursors; H02J covers the charge-protocol and systems-level angle on thermal aging. Both carry plausible technical value and remain less contested than the core H01M space.
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