Lithium Manganese Oxide Fast-Charging Patents: Leaders & Gaps 2026
- Filing already peaked. 2018 recorded 11 filings, the high point of the series; by the 2022 midpoint the annual count had fallen back to 3, and it has not recovered since.
- Spinel chemistry dominates the claim set. 42 of 43 records sit in H01M, with C01G compound claims a distant second at 9 — most of the remaining subclasses show single-digit activity.
- Filing is split across three regions, not one. Europe (16) and the United States (15) carry nearly all activity, with China, the UK, WIPO and India each holding single digits.
What this landscape covers
This dataset tracks patent families combining lithium manganese oxide (LMO / LiMn2O4) cathode chemistry with fast-charging claims — protocols, rate capability and charge-stability language filed against H01M10/44, H02J7/00 and H01M4/505. It captures 43 published families filed between 2015 and mid-2026, with the most recent year necessarily incomplete because publication typically lags filing by around 18 months.
The picture is one of a technology area that had its filing surge already: activity rose to a 2018 peak, then thinned to single digits through the 2020s. That pattern matters for anyone deciding whether to file now — it signals which claim territory was staked early and which corners were left alone as the wave receded.
Filing trend and technology composition
Two views of the same 43-family dataset: how filing volume moved year over year, and which IPC subclasses the claims actually sit in.
A peak already behind it
Annual filings ran from 2 in 2017 to a peak of 11 in 2018, then declined toward the 2022 midpoint of 3 and stayed flat through the most recent complete years. This is a declining-to-flat trend, not a growing one — later entrants are filing into a space that earlier applicants have already thinned out, rather than into open growth.
Concentrated in one subclass
H01M (batteries, cells and fuel cells) accounts for 42 of 43 records — essentially the entire dataset. C01G (compounds of other metals, relevant to manganese oxide precursor chemistry) holds 9, H02J (power supply and charging systems) 6, and H01G, G01R and B82Y each register in single digits. The imbalance shows claim activity has stayed on the cathode-and-cell side of the problem; charging-circuit and measurement-side claims are comparatively rare.
Shares are the percentage of the 43 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Lithium Manganese Oxide Battery Fast Charging with Eureka
This page is one run against one query. Ask Eureka your own question about lithium manganese oxide battery fast charging and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art that gets cited
Photo-assisted fast charging of lithium manganese oxide spinel (LiMn2O4) in lithium-ion batteries
An electrochemical cell includes a cathode, an anode, a non-aqueous electrolyte, and a cathode illumination source.Filed by UCHICAGO ARGONNE, LLC (2018-01-25). The claim couples LMO spinel chemistry to a physical illumination mechanism at the cathode, rather than to a charging-protocol or circuit-level claim — a narrower and more specific route than most fast-charging filings take.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060019151A1 | Non-aqueous electrolyte battery | 63 |
| 2 | EP1619733A1 | Non-aqueous electrolyte battery | 22 |
| 3 | US20180026317A1 | PHOTO-ASSISTED FAST CHARGING OF LITHIUM MANGANESE OXIDE SPINEL (LiMn2O4) IN LITHIUM-ION BATTERIES | 15 |
| 4 | CN114089191A | 一种复合锂离子电池健康状况估计方法 | 13 |
| 5 | US20200119341A1 | Spinel-Structured Lithium Manganese-Based Positive Electrode Active Material, and Positive Electrode and Lith… | 9 |
| 6 | WO2018213644A1 | Dissolution resistant nanoporous lithium manganese oxide | 5 |
| 7 | GB2328684A | A lithium manganese oxide powder and preparation thereof | 5 |
| 8 | WO2023117170A2 | Energy storage cells with fast charge and discharge capabilites | 3 |
| 9 | US20220052331A1 | Octahedral-Structured Lithium Manganese-Based Positive Electrode Active Material, and Positive Electrode and … | 3 |
| 10 | CN110190273A | 一种石墨烯掺杂的锰酸锂正极材料及其制备方法 | 3 |
Citation counts here favour older filings simply because they have had longer to accumulate citations within this searched corpus — treat them as a marker of influence on the field's early framing, not 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 mean for a filing decision
Three things stand out once you look past the raw counts: where the claim volume actually sits, what the most-cited prior art protects, and what the recent-year silence across major assignees implies.
The surge already happened
Annual filings peaked in 2018 and have not returned to that level since. A team filing now is not catching a wave — it is filing into a space where the dominant early claims have already been staked, which raises the bar for what counts as a defensible new claim.
Almost all claim activity is cell-side
The subclass split shows claims overwhelmingly cover the battery cell and cathode material itself, not the charging circuitry or grid-interface side (H02J, 6 records) or measurement methods (G01R, 2 records). That imbalance is itself informative about where less-crowded claim territory sits.
No single office dominates
Europe and the United States between them hold the large majority of filings, with China, the UK, WIPO and India each in single digits. A filing strategy built around only one jurisdiction would miss where most of the existing claim density actually sits.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to lithium manganese oxide battery fast charging, with the prior art for and against each one.
Assignees and where the recent momentum sits
The assignee set includes established cell manufacturers, national labs and university filers. What stands out this cycle is not who leads by volume but that momentum has gone quiet across the board.
Recent-year filing has gone flat for the field's biggest names
Every assignee tracked for recent-year momentum — including major cell manufacturers and a national laboratory — shows zero filings in the latest tracked year. That is consistent with the broader decline from the 2018 peak rather than a single company pulling back.
A mix of corporate, lab and academic filers
The assignee list spans battery cell makers, a US national laboratory (Argonne), and university filers, indicating the topic sits at the intersection of applied cell engineering and materials research rather than being owned by one industry segment.
Filing spans multiple jurisdictions without one clear hub
With EPO and US offices carrying the bulk of filings and China, UK, WIPO and India each holding a handful, no single jurisdiction has become the default venue for this technology the way some adjacent battery fields have consolidated around one office.
| Assignee | Recent year | YoY |
|---|---|---|
| Skeleton Technologies | 0 | — |
| LG Chem, Ltd. | 0 | — |
| UChicago Argonne, LLC | 0 | — |
| LG Energy Solution, Ltd. | 0 | — |
| Contemporary Amperex Technology Co., Ltd. (CATL) | 0 | — |
| Samsung Electro-Mechanics Co., Ltd. | 0 | — |
| Zhejiang University City College | 0 | — |
| The Regents of the University of California | 0 | — |
Where to take this
The filing trend and IPC split point to a technology that peaked in claim activity several years ago. The open questions now are about where the remaining gaps sit and how defensible a new filing would be.
Map the charging-protocol gap in detail
H02J-classified claims are a small fraction of this dataset. Before assuming that space is open, check whether it is under-claimed because it is genuinely novel or because it has been covered by broader circuit patents outside this search string.
Explore charging-protocol claims in EurekaCheck freedom-to-operate against the most-cited prior art
The two most-cited records both cover non-aqueous electrolyte battery structures broadly, not fast-charging specifically. Any new filing touching electrolyte composition alongside LMO chemistry should be checked against that base layer first.
Run a freedom-to-operate check in EurekaCommon questions about this landscape
Filing activity peaked in 2018 at 11 records and has declined since, sitting at 3 by the 2022 midpoint of this dataset with no recovery through the most recent complete years. That does not mean the chemistry itself is abandoned commercially, but it does mean the patent filing wave around fast-charging claims specifically has already passed its high point. Anyone evaluating this space should treat the current period as post-peak rather than emerging.
The most-cited record in this dataset, US20060019151A1, covers non-aqueous electrolyte battery structure generally rather than fast-charging protocols specifically, and it has accumulated 63 citations within this corpus. A related European filing, EP1619733A1, covers similar ground with 22 citations. Because older filings simply have more time to accumulate citations, high citation counts here reflect early influence on the field's framing rather than current commercial dominance.
US20180026317A1, filed by UCHICAGO ARGONNE, LLC in January 2018, claims an electrochemical cell with a cathode, anode, non-aqueous electrolyte and a cathode illumination source — a photo-assisted approach to fast charging rather than a conventional charging-protocol or circuit claim. Its scope is narrow: it protects the illumination-assisted mechanism specifically, not fast charging of LMO spinel chemistry in general. That narrowness is exactly what leaves room for other technical routes to fast-charge LMO cells without touching this claim.
The IPC composition shows 42 of 43 records sit in H01M, the core battery-cell classification, while H02J (charging circuitry and power supply systems) holds only 6 and G01R (measurement) only 2. That imbalance suggests charge-control algorithms, in-situ rate-capability measurement, and precursor synthesis routes for the manganese oxide itself are comparatively under-claimed relative to the cathode chemistry. A first claim in one of these branches would need to tie the mechanism specifically to LMO's known manganese-dissolution and rate-capability limits to be defensible.
Europe (EPO) leads with 16 filings and the United States follows closely with 15, together accounting for the large majority of this 43-family dataset. China, the United Kingdom, WIPO and India each hold single-digit counts. A filing strategy focused only on one of these offices would miss most of the existing claim density, since activity is genuinely split rather than concentrated in one jurisdiction.
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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.