LFP Battery Interface Patents: Who Leads, Where the Gaps Are 2026
- Filing has flattened, not grown. activity roughly doubled from the 2022 midpoint to a 2025 peak, but the shape is a plateau, not a curve — the interface-coating claim space is filling in rather than exploding.
- China dominates the filing venue. of the 162 records tracked, the receiving-office split skews heavily toward CNIPA versus the US, EPO, WIPO, Germany and India combined.
- Citation weight sits on older, broader patents. the most-cited records in this set are nanocomposite and carbon-coating patents filed years before the current CEI-specific wave, a sign the newest filings haven't yet accrued influence.
Filing growth compares 2021 (4 records) with 2024 (28) — 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 162 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This set tracks patent families at the intersection of lithium iron phosphate (LFP) cathode chemistry and interface engineering — surface coating, cathode-electrolyte interphase (CEI) formation, and interface stabilization claimed against the core LFP and related cathode/electrolyte IPC classes. It is a narrow, claims-anchored slice of the broader LFP literature: 162 families published between 2015 and mid-2026, concentrated almost entirely in H01M battery classifications with secondary weight in inorganic-compound chemistry classes.
Because publication typically lags filing by around 18 months, the 2026 count is necessarily incomplete and the 2025 peak is the most reliable recent read on filing intensity. The picture below should be read as where claim density already sits, not as a forecast of where the technology is headed next.
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Filing trend and technology composition
Two views of the same 162-family dataset: how filing volume has moved year over year, and how those filings distribute across IPC subclasses.
Filing trend, 2017–2026
From a single filing in 2017, volume climbed through a 2022 midpoint of 23 to a peak of 37 in 2025. The 2026 figure of 13 reflects a partial year and should not be read as a decline.
IPC subclass distribution
Every record sits in H01M (batteries, cells & fuel cells). The next-largest group, C01B (non-metallic elements & inorganic compounds), appears in a minority of records, with nanotechnology (B82Y), organo-metallic chemistry (C07F), EV propulsion (B60L) and coating processes (B05D) contributing only a handful each — evidence that this is a tightly bounded battery-materials niche rather than a cross-industry technology.
Shares are the percentage of the 162 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Lithium Iron Phosphate Battery Interface Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about lithium iron phosphate battery interface engineering and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US12252400B1 — Preparation method for lithium iron phosphate cathode material and lithium battery
The present application belongs to the field of lithium battery technology, particularly relating to a preparation method for lithium iron phosphate cathode material and lithium battery. The method comprises: adding lithium source, iron source, phosphorus source, first carbon source, dopant, and dispersant into a solvent according to a preset ratio for mixing and grinding treatment to obtain the first mixture; drying the first mixture and performing the first sintering in an inert gas atmosphere to obtain the lithium iron phosphate precursor; adding borohydride, deionized water, second carbon source, and dispersant to the lithium iron phosphate precursor for pretreatment to obtain the lithium…Filed by Hunan Yuneng New Energy Battery Materials Co., Ltd., dated 2025-03-18 — a two-stage synthesis route combining doping and a borohydride pretreatment step ahead of a second carbon-coating stage.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100233538A1 | Open porous electrically conductive nanocomposite material | 93 |
| 2 | EP2228855A1 | Open porous electrically conductive nanocomposite material | 36 |
| 3 | CN103904311A | 一种表面包覆复合的富锂锰基正极材料及其制备方法 | 31 |
| 4 | CN105355880A | 一种LiFePO4/C改性三元正极材料的制备方法 | 27 |
| 5 | CN101567441A | 一步法碳包覆的LiFePO4粉体的制备方法 | 27 |
| 6 | US20140106223A1 | METHODS FOR SURFACE COATING OF CATHODE MATERIAL LiNi0.5-XMn1.5MXO4 FOR LITHIUM-ION BATTERIES | 23 |
| 7 | CN104733708A | 一种表面包覆磷酸铁锂的镍钴锰酸锂复合材料的制备方法 | 19 |
| 8 | CN110589793A | 一种金属掺杂和Mxene包覆双重改性磷酸铁锂复合材料及制备方法与应用 | 17 |
| 9 | CN115149121A | 一种锂离子电池 | 15 |
| 10 | CN104979557A | 一种高倍率磷酸铁锂正极材料及电池极片 | 13 |
Citation counts favour older records simply because they've had longer to accumulate citations inside this corpus — treat them as a signal of influence on subsequent filings, not as a ranking of current technical importance.
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 filing strategy
Read together, the trend, the IPC spread and the citation pattern point to a technology where the core claim space is occupied but the interface-specific sub-branches are still being staked out.
Growth has plateaued, not accelerated
Volume moved from 1 filing in 2017 to a midpoint of 23 in 2022 and a peak of 37 in 2025. That trajectory is flattening rather than compounding, which usually means the obvious coating and doping combinations have already been claimed by incumbents.
Filing is a China-centric contest
China accounts for well over half of all receiving-office activity, with the US, EPO and WIPO trailing well behind. Freedom-to-operate work that only screens US and EPO filings will miss most of the active claim space.
Influence sits with older nanocomposite art
The most-cited documents in this set are open-porous conductive nanocomposite and carbon-coating patents that predate the current CEI-specific wave. Newer, more narrowly scoped interface filings haven't had time to accumulate citations, so don't mistake low citation counts for low relevance.
A single-subclass technology
Every record classifies under H01M; the next subclass, C01B, appears in only a minority of filings. This is a materials-chemistry niche inside battery patenting, not a cross-sector technology, so competitive tracking can stay narrowly scoped to battery-class IPC codes.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to lithium iron phosphate battery interface engineering, with the prior art for and against each one.
Who is filing, and where the ownership gaps sit
Assignee activity in this dataset is dispersed rather than dominated by one filer, with cross-assignee collaboration limited to a small number of pairs.
Hefei Guoxuan High-Tech Power Energy Co., Ltd. holds the only positive momentum
Among the tracked assignees, Hefei Guoxuan High-Tech Power Energy is the only one showing a filing in the latest tracked year, while several previously active filers — including CATL, down 100% year-on-year — show none.
Cross-assignee filing is rare and concentrated
Only two co-assignee pairs appear in this dataset. The strongest, Kokam and Daejung EM, has co-filed five times; the second, Samsung SDI and Robert Bosch, twice. Most activity here is filed solo.
Chinese cathode-material makers set the pace
The receiving-office split and the assignee list both point the same way: material producers filing primarily through CNIPA are driving current volume, ahead of the multinational cell makers who dominate citation counts from older filings.
| Assignee | Recent year | YoY |
|---|---|---|
| Hefei Guoxuan High-Tech Power Energy Co., Ltd. | 1 | 0% |
| LG Energy Solution, Ltd. | 0 | — |
| Xinqiangneng Battery Co., Ltd. | 0 | — |
| Contemporary Amperex Technology Co., Ltd. (CATL) | 0 | -100% |
| Baleno Clean Energy Holdings Co., Ltd. | 0 | — |
| Kokam Co., Ltd. | 0 | — |
| Rivian IP Holdings, LLC | 0 | — |
| DAEJUNG EM CO LTD | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, whitespace filing, or competitive tracking.
Run a freedom-to-operate screen on coating claims
With 100 of 162 families routed through CNIPA, a US- or EPO-only clearance search will systematically undercount the active claim space around surface coating and CEI stabilization.
Explore in Eureka →Track the assignees still filing
Momentum has narrowed to a small set of active filers. Watching who keeps filing versus who has gone quiet is a faster signal than raw historical volume.
Explore in Eureka →Probe the under-claimed sub-branches
Gradient doping, borohydride pretreatment and non-carbon coating chemistries show thinner claim density than the core carbon-coating space and merit a closer look before drafting.
Explore in Eureka →Frequently asked questions
CEI engineering refers to controlling the thin reaction layer that forms between the lithium iron phosphate cathode surface and the liquid or solid electrolyte during cycling. This layer strongly influences impedance growth, capacity fade and gas generation over the battery's life. Patent activity in this space centres on surface coatings, dopants and pretreatment steps designed to form a more stable, lower-resistance interphase than the one that forms unmodified. In this dataset, CEI-specific claims sit alongside the older, broader surface-coating and nanocomposite patents that still carry the most citations.
Filing activity in this dataset is spread across Chinese cathode-material producers, Korean and Chinese cell makers, and a small number of European and North American entrants, without a single dominant assignee. Momentum has narrowed recently: only Hefei Guoxuan High-Tech Power Energy shows a filing in the latest tracked year among the assignees tracked for momentum, while several previously active filers, including CATL, show none. Co-filing between assignees is uncommon, limited to two identified pairs, so most work in this space is filed independently rather than jointly.
Of the 162 tracked families, 100 were filed through CNIPA, far ahead of the US (26), EPO (19) and WIPO PCT route (10). This reflects where LFP cathode-material manufacturing and cell production are concentrated, since interface-coating process patents tend to be filed close to where the material is actually produced. Anyone doing freedom-to-operate work on coating or CEI claims should treat CNIPA as the primary venue to search, not a secondary one.
The core carbon-coating and doping space is densely claimed, evidenced by 162 families concentrated almost entirely in a single IPC subclass (H01M) and a filing trend that has plateaued rather than accelerated after peaking in 2025. That said, high density in the core space does not mean the whole field is closed: sub-branches such as gradient dopant profiles, borohydride pretreatment steps and non-carbon coating chemistries show comparatively thin claim coverage and are worth screening before assuming the space is occupied.
Not very, on its own. Patent publication typically lags the actual filing date by around 18 months, so the 13 records showing for 2026 in this dataset understate real filing activity for that year, and the 2025 figure of 37 is the most recent number that can be read with confidence. Anyone using this data to judge current momentum should weight the last one to two years less heavily than the multi-year trend.
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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.