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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/lithium-iron-phosphate-battery-environmental-durability-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Battery & Energy StorageLithium Iron Phosphate Battery Environmental Durability Patents
- Filing has plateaued, not grown. activity peaked in 2022 at 59 families and the run-rate since has flattened rather than climbed, so this is a claim-space consolidation phase, not an emerging one.
- China dominates the filing venue. 181 of 284 records were filed at CNIPA against 40 each at the EPO and USPTO, meaning defensive freedom-to-operate work outside China still has real room.
- Composite cathode chemistry, not cell design, carries the durability claims. 106 of 284 records also sit in C01B (inorganic compounds), pointing to material-level phosphate and dopant work as the real battleground behind the H01M cell claims.
284
Published Records
24%
Top-5 Share of All Records
+74%
Filing Growth 2021→2024
CN
Leading Jurisdiction
Filing growth compares 2021 (27 records) with 2024 (47) — 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 284 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This dataset tracks patent families that combine lithium iron phosphate (LFP/LiFePO4) cell chemistry with explicit environmental-durability language — low-temperature performance, thermal cycling durability, calendar aging and humidity resistance — inside the core battery IPC classes (H01M10/48, H01M4/58, H01M10/625). It is a subset of the broader LFP patent space, narrowed deliberately to the claims that address how these cells behave outside a lab bench: cold-climate range loss, capacity fade over repeated cycles, and moisture ingress into the cell stack.
284 published records span 2015 to mid-2026, with China as the dominant filing venue and a filing curve that has already crested. Publication lags filing by roughly 18 months, so the last one to two years in any chart will read lower than the true filing rate once the backlog clears.
Filing activity and technology composition, 2017–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The data
Filing trend and technology composition
Two views of the same 284 families: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
A peak already behind the field
Filings rose from 8 in 2017 to a peak of 59 in 2022, then eased off. A midpoint year matching the peak signals the field has moved past its steepest growth and into a maintenance phase where incumbents defend positions rather than a wave of new entrants stakes fresh ground.
Cell claims dominate, but chemistry is the second largest bloc
Every record touches H01M (batteries and cells), as expected given the search scope. The next-largest bloc, C01B at 106 records, covers non-metallic inorganic compounds — meaning a large share of durability claims are actually about phosphate compound formulation and doping rather than pack or cell architecture. Nanotechnology (B82Y, 18 records) is a distinct minority track, likely coating and particle-size approaches to conductivity and cycling stability.
Shares are the percentage of the 284 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Lithium Iron Phosphate Battery Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about lithium iron phosphate battery environmental durability and every answer comes back with the patent numbers behind it.
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Representative and most-cited filings
Representative recent filing
US20250279473A1 — Electrolyte for lithium iron phosphate battery, and lithium iron phosphate battery
GUANGZHOU TINCI MATERIALS TECHNOLOGY CO., LTD
An electrolytic solution for a lithium iron phosphate battery, and a lithium iron phosphate battery. The electrolytic solution includes a solvent, a lithium salt, a first additive and a second additive.Filed by Guangzhou Tinci Materials Technology Co., Ltd, published 2025-09-04, it illustrates how current durability work increasingly runs through electrolyte additive chemistry rather than the electrode material alone.
Most-cited records in this corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN110943215A | 锂离子二次电池 | 74 |
| 2 | CN102496714A | 一种正极活性物质及其生产方法和所应用的锂离子电池 | 36 |
| 3 | CN113086959A | 高压实低温型磷酸铁锂材料、锂电池正极片及其制备方法 | 35 |
| 4 | CN109860572A | 三维网络结构复合碳包覆的纳米级磷酸铁锂的制备方法 | 31 |
| 5 | CN103618084A | 一种锂离子动力电池混合正极材料 | 30 |
| 6 | CN109607505A | 一种改善低温性能的磷酸铁锂的制备方法 | 28 |
| 7 | CN108520947A | 改性磷酸铁锂材料、锂离子电池、动力电池组及其应用 | 28 |
| 8 | CN102544505A | 磷酸铁锂正极材料的表面改性方法 | 27 |
| 9 | CN113113583A | 一种纳米化碳包覆复合磷酸铁锂低温正极材料的制备方法 | 22 |
| 10 | US20210143440A1 | Lithium-ion secondary battery | 21 |
Citation counts favour older filings simply because they have had more time to be cited; read them as a signal of influence within this search corpus, 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.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers say about where this field stands
Four read-outs from the filing trend, venue split and citation pattern, translated into what they mean for a filing or freedom-to-operate decision.
Filing momentum
Peak year 2022: 59
families filed
Growth has already crested
The filing count rose steadily to a 2022 peak and has not exceeded it since. That flat-to-declining pattern after a clear peak usually means the core claim positions are staked and later filers are working narrower gaps, not opening new ground.
Based on 2017–2026 filing counts
Venue concentration
181 of 284 at CNIPA
China-filed share
Filing is concentrated in one jurisdiction
China accounts for close to two-thirds of all records, with the EPO and USPTO each holding 40. Durability claims that never leave China carry no enforcement weight in Europe or the US, which is exactly where a freedom-to-operate gap can open for filers who move quickly there.
Receiving office counts across 284 records
Chemistry vs. architecture
106 records in C01B
inorganic-compound overlap
Material formulation carries much of the durability claim load
More than a third of records also classify under C01B, the inorganic-compounds class, alongside the expected H01M battery classification. That overlap indicates durability gains are being claimed at the level of phosphate compound and dopant chemistry as often as at the cell or pack level.
IPC subclass counts across 284 records
Citation pattern
Top cite: 74
citations on the leading record
Influence skews toward earlier cathode-material filings
The most-cited records in this corpus are cathode active-material and composite-material filings rather than recent electrolyte or pack-level work. That is partly a citation-age effect — older filings simply accumulate more citations — but it also confirms cathode formulation as the historical anchor of this field.
Citation counts within this search corpus
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to lithium iron phosphate battery environmental durability, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gate sits
Recent-year momentum is thin across the board — most tracked assignees show only one filing in the latest year, and the strongest co-assignee links point to intra-group filing structures rather than external collaboration.
Momentum leader
1 filing, latest year
Contemporary Amperex Technology (CATL)
Flat momentum even at the top
CATL shows a single filing in the latest tracked year with 0% year-on-year change — consistent with the broader plateau rather than any renewed push into this specific durability niche.
Latest-year filing count
Group filing structure
6 co-assignee pairs
Foshan Dynanonic entities
Related-entity filing, not open collaboration
The strongest co-assignee link — 6 shared filings — runs between two entities of the same corporate group (Foshan Dynanonic and its Shenzhen counterpart), with a third group entity in Qujing also linked. This looks like internal group structuring rather than cross-company partnership.
Co-assignee pair strength, 4 pairs total
Declining incumbent
-100% YoY
BYD Co., Ltd
A major cell maker has stepped back from this niche
BYD shows zero filings in the latest tracked year against a prior filing, a full year-on-year drop. That does not mean BYD has exited LFP durability work broadly — it may simply have shifted claim language or filing venue outside this search string's scope.
Latest-year filing count
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | 1 | 0% |
| Hefei Guoxuan High-Tech Power Energy Co., Ltd. | 1 | — |
| SVOLT Energy Technology Co., Ltd. | 1 | -50% |
| Hubei EVE Power Co., Ltd. | 0 | — |
| BYD Co., Ltd. | 0 | -100% |
| Foshan Dynanonic Co., Ltd. | 0 | — |
| Shenzhen Dynanonic Co., Ltd. | 0 | -100% |
| Hubei Wanrun New Energy Technology Co., Ltd. | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's next
Where to take this
The filing trend and claim map point to specific next steps depending on whether you are scoping freedom-to-operate, choosing a filing venue, or looking for open claim space.
Check freedom-to-operate outside China
With 181 of 284 records filed at CNIPA and only 40 each at the EPO and USPTO, durability claims filed only in China may not block a Western launch — but that gap closes as PCT filings convert.
Run a freedom-to-operate check in EurekaProbe the electrolyte-additive branch
The representative 2025 filing from Guangzhou Tinci shows durability claims moving into electrolyte additive chemistry. This branch is thinner than cathode-material claims and may still have open claim space.
Explore electrolyte claims in EurekaWatch for group-entity filing patterns
The strongest co-assignee links in this corpus run within a single corporate group's related entities. Mapping those structures early avoids mistaking internal filing spread for independent competitive activity.
Map assignee networks in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about this landscape
This dataset identifies 284 published patent families combining lithium iron phosphate chemistry with explicit low-temperature, thermal cycling, calendar aging or humidity resistance claims within the core battery IPC classes. That is a narrow, deliberately scoped subset of the much larger overall LFP patent space, so it should not be read as the full LFP filing count. Families, rather than raw document counts, are the fairer unit here because they neutralise duplicate filings across jurisdictions for the same invention.
No — filings rose from 8 in 2017 to a peak of 59 in 2022 and have not exceeded that peak since, which indicates the field has moved past its fastest growth phase. Because publication lags filing by roughly 18 months, the most recent one to two years will always look lower than the true filing rate until the backlog clears. Even accounting for that lag, the flattening trend after a clear peak is a stronger signal than any single recent year.
China holds the large majority of filings in this corpus — 181 of 284 records were filed at CNIPA, against 40 each at the EPO and USPTO. That means a China-only freedom-to-operate check will miss the roughly one-third of records filed in Europe or the US, and vice versa a check limited to Western offices will miss the bulk of the documented claim activity. A thorough clearance needs both venues covered, particularly for any product headed for a global launch.
The IPC composition points toward material chemistry carrying a large share of the claim weight. Alongside the expected H01M battery classification present in all 284 records, 106 records also classify under C01B, the inorganic-compounds class covering phosphate and dopant formulation. That overlap suggests durability improvements are frequently being claimed at the level of the cathode material itself rather than through cell or pack architecture changes.
Branches such as humidity-resistant separator coatings, low-temperature electrolyte additive systems and in-situ calendar-aging state estimation show far fewer records than the dominant cathode-material claims, based on the IPC and citation distribution in this corpus. That does not guarantee those areas are unclaimed elsewhere, but within this dataset they carry noticeably less filing density. A targeted search within one of those branches is a reasonable starting point before committing to a filing strategy.
Answers are grounded in the same dataset. Derived from a Patsnap search on Lithium Iron Phosphate Battery Environmental Durability covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.