NMC Battery Reliability Patents: Leaders & White Space 2026
- Filing has cooled since a 2020 peak. 46 families published that year against a single-digit count by 2022, so claim activity on cycle-life and calendar-aging is past its filing high point even before the recent-year reporting lag is factored in.
- Cathode chemistry, not pack engineering, carries the claim weight. 83 of 186 families sit in C01G (compounds of other metals) alongside the core H01M battery class, while vehicle-integration classes like B60L and B60K each account for a handful of records.
- Co-filing is rare and concentrated in one corporate family. Only two co-assignee pairs appear across the dataset, and the strongest link ties two entities from the same corporate group together 39 times — collaboration outside that group is essentially absent.
Filing growth compares 2021 (8 records) with 2024 (7) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 186 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This review tracks patent families addressing cycle life, calendar aging and capacity-fade mitigation in NMC (nickel manganese cobalt) cathode systems, filed between 2015 and mid-2026. The search combines NMC-specific terminology with durability-oriented claim language, so the set is narrower than general NMC cathode patenting: it captures the subset of filings that make an explicit durability or aging claim rather than every composition or manufacturing patent touching NMC chemistry.
Coverage spans 186 published families across six receiving offices, with the United States and the European Patent Office together accounting for the large majority of filings. Publication lags filing by roughly eighteen months, so any apparent drop in the most recent year understates real filing activity rather than reflecting an actual slowdown.
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Filing trend and technology mix
Two views of the same 186-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the durability claims.
A 2020 peak followed by a steep decline
Filings rose from 10 in 2017 to a peak of 46 in 2020, then fell sharply — by 2022 the midpoint year sat at just 5 families. That trajectory points to a filing wave tied to a specific period of cathode-durability R&D rather than sustained, steadily growing investment. Recent years should be read with the 18-month publication lag in mind before concluding the field has gone quiet.
Cathode chemistry dominates over pack-level claims
H01M (batteries, cells and fuel cells) is present in every record by construction of the search, but C01G (compounds of other metals) appears in 83 of 186 families — the clearest signal that durability improvements are being claimed at the active-material level. Vehicle-integration classes (B60L, B60K) and process classes (B23K) each register only a handful of records, suggesting most durability engineering is happening in the cathode formulation and coating rather than at the module or pack level.
Shares are the percentage of the 186 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on NMC Battery Reliability and Durability with Eureka
This page is one run against one query. Ask Eureka your own question about nmc battery reliability and durability and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
X-processing of NMC cathode active material (CAM) for longer cycle life and stability
A method for increasing charge-discharge cycle life and stability/safety of Li-NMC cathode active material by processing NMC-111, NMC-532, NMC-622, NMC-811 or NMC-9.5.5 with X-elements in an X-containing solvent, followed by high-temperature sintering to embed those elements in the CAM matrix.Filed by International Battery Company, Inc. — published 2024-09-19.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180108940A1 | Positive electrode active material for secondary battery, method of preparing the same, and secondary battery… | 76 |
| 2 | US20160211517A1 | Lithium rich nickel manganese cobalt oxide (LR-NMC) | 76 |
| 3 | US20170338471A1 | High capacity and stable cathode materials | 58 |
| 4 | US20180013129A1 | Positive electrode active material for secondary battery, method of preparing the same, and secondary battery… | 58 |
| 5 | US20190207209A1 | Electrodes with silicon oxide active materials for lithium ion cells achieving high capacity, high energy den… | 51 |
| 6 | US20090011334A1 | Lithium secondary battery and positive electrode material thereof | 40 |
| 7 | US20210202940A1 | Method and systems for coated cathode materials and use of coated cathode materials | 25 |
| 8 | WO2017168274A1 | Lithium ion battery for automotive application | 24 |
| 9 | US10199649B2 | Lithium rich nickel manganese cobalt oxide (LR-NMC) | 21 |
| 10 | US20200411901A1 | Lithium ion cells with high performance electroyte and silicon oxide active materials achieving very long cyc… | 20 |
Citation counts favour older filings that have had more time to accumulate citations within the searched corpus; treat them as an influence signal rather than a ranking of current-year importance.
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 the state of the art
Four data points that shape how a freedom-to-operate or whitespace assessment should be scoped in this area.
The filing wave has passed its peak
Volume climbed from 10 families in 2017 to 46 in 2020, then dropped to 5 by 2022. That shape is more consistent with a concentrated R&D push around a specific durability approach than with an emerging, still-accelerating field.
Durability claims sit in cathode chemistry, not integration
The compounds-of-other-metals class appears in nearly half of all records, while EV-propulsion classes (B60L, B60K) together account for fewer than ten. Cycle-life and calendar-aging improvements in this corpus are being won at the material level.
US and Europe anchor the filing strategy
The United States receives the largest single share of filings, with Europe close behind and WIPO PCT filings a distant third. Japan, India and Canada each register single-digit-to-low-double-digit counts, indicating durability claims are pursued mainly through US and European prosecution before wider PCT expansion.
Co-filing is rare and internal
Only two co-assignee pairings appear in the dataset, and the strongest — linked 39 times — connects two entities within the same corporate group. Durability patenting here is overwhelmingly a single-assignee activity rather than a joint-venture or cross-licensing pattern.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to nmc battery reliability and durability, with the prior art for and against each one.
Who holds the durability claims
Recent-year momentum figures show a field where the historically dominant filers have gone quiet in the latest reported year — consistent with the broader post-2020 filing decline rather than any single company's exit.
One group anchors the densest claim cluster
The Umicore-linked entities in this dataset co-file with each other far more than any other pair, forming the only meaningful collaboration cluster in the corpus. Their combined position covers a large share of the cathode-durability claim space tracked here.
Historic leaders show no latest-year activity
Every assignee tracked for recent-year momentum, including established cathode and cell manufacturers, shows zero filings in the latest year and several show a full year-over-year decline. This mirrors the corpus-wide drop after 2020 rather than indicating any one filer has stopped working on durability.
Smaller filers are still entering with specific process claims
Not every active filer here is a large integrated manufacturer. The representative 2024 filing on X-element processing of NMC cathode active material comes from a smaller, specialised filer, showing the field still has room for narrowly scoped process patents.
| Assignee | Recent year | YoY |
|---|---|---|
| Umicore Korea Ltd. | 0 | — |
| Umicore N.V./S.A. (Belgium) | 0 | -100% |
| Sumitomo Metal Mining Co., Ltd. | 0 | -100% |
| LG Chem, Ltd. | 0 | — |
| GenLabs Energy Ltd. | 0 | — |
| Umicore AG & Co. KG | 0 | — |
| Tesla Motors Canada ULC | 0 | — |
| QuantumScape Corporation | 0 | — |
Where to take this analysis
The filing trend and assignee concentration point to specific next steps depending on what you're trying to decide.
Check freedom to operate against the Umicore cluster
The strongest co-assignee link in this dataset covers a dense set of cathode-durability claims. Any new filing or product touching NMC cycle-life chemistry should be checked against this cluster's claim scope specifically, not just the corpus average.
Run a freedom-to-operate check in EurekaRe-test the white space chips against live filings
The under-claimed branches flagged here — silicon-oxide pairing, weld durability, calendar-aging protocols — were thin at the time of this dataset's cut-off. Given the publication lag, a fresh pull is worth running before committing to a filing strategy in any of them.
Explore white space in EurekaWatch for the next filing wave
Filing peaked in 2020 and declined sharply through 2022; whether that trend has reversed in years affected by the publication lag is not yet visible in public data. Monitoring new publications as they clear the lag will show whether durability patenting is picking back up.
Set up monitoring in EurekaCommon questions about NMC durability patents
In this landscape, it means a patent family that combines NMC (nickel manganese cobalt) cathode terminology with an explicit durability claim element — cycle life, calendar aging, or capacity-fade mitigation. This is narrower than the full set of NMC cathode patents, since many composition and manufacturing filings do not make a durability claim explicitly. The 186 families here were selected using that combined criterion across title, abstract and IPC classification fields.
The dataset shows a small cluster of related Umicore entities forming the strongest collaboration link, alongside other established cathode and cell manufacturers appearing individually. However, recent-year momentum data shows essentially all tracked assignees, including the historically active ones, recorded no filings in the latest reported year. That drop is consistent with the corpus-wide decline after the 2020 peak rather than signalling any single company's withdrawal from the field.
Filing volume rose from 10 families in 2017 to 46 in 2020, then fell to around 5 by the 2022 midpoint. This pattern typically reflects a concentrated research and filing push tied to a specific technical approach or product cycle, rather than a market that is losing interest in cathode durability generally. It's also important to weigh recent years against the roughly 18-month lag between filing and publication, which understates true activity in 2024-2026.
The technology composition data shows durability claims concentrated heavily in cathode chemistry (C01G, alongside core H01M battery classes), while adjacent branches such as EV-specific thermal cycling mitigation, weld or joint durability at the cell-to-pack level, and calendar-aging test protocols as claim subject matter each register only a handful of records. These thinner branches are candidates for new filings, though they should be re-checked against current filings given the publication lag before committing to a strategy.
Not necessarily. Citation counts accumulate over time, so older records in a searched corpus tend to show higher citation totals simply because they have had longer to be cited, not because they are more relevant to current commercial activity. The most-cited records in this dataset are useful for understanding which early cathode-composition approaches became reference points, but a freedom-to-operate review should also weigh recent filings that haven't had time to accumulate citations yet.
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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.