Oxide and Polymer Solid Electrolytes Patents: Leaders & Trends 2026
- Filing peaked in 2025 at 59 families, after climbing from 5 in 2017 through a 2022 midpoint of 35 — growth that has since flattened rather than kept accelerating.
- China dominates the filing venue, with 224 of 335 families routed through its patent office, versus 39 in the US and 27 at the EPO.
- Several recent leaders show zero filings in the latest year, including LG Energy Solution and Samsung Electronics, both down -100% YoY — a caution against reading momentum from cumulative counts alone.
Filing growth compares 2021 (36 records) with 2024 (55) — 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 335 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 335 patent families filed between 2015 and mid-2026 that combine oxide or polymer solid electrolyte claims with process or performance language — grain boundary resistance, sintering, composite electrolyte, lithium symmetric cell, or electrochemical window — under battery, ceramics and polymer IPC classes. The scope deliberately excludes sulfide-only chemistries unless they appear alongside an oxide or polymer claim.
Because publication lags filing by roughly 18 months, the 2026 figure understates true filing activity for that year; treat the 2025 peak as the most reliable recent read on activity, and the 2026 partial-year figure as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 335 families: how filing volume has moved year over year, and how the underlying claims split across ceramics, polymer chemistry and battery IPC subclasses.
A decade of uneven growth
Filings rose from 5 in 2017 to a peak of 59 in 2025, passing through 35 at the 2022 midpoint. The shape is front-loaded growth followed by a plateau rather than a straight climb — treat any single-year dip, including the partial 2026 count of 8, as a publication-lag artefact rather than a real slowdown.
Where the claims sit
H01M (batteries and cells) anchors nearly the entire corpus at 328 of 335 records, confirming this is fundamentally a battery-materials landscape rather than a ceramics or polymer-chemistry one. C04B (ceramics) at 38 and the polymer classes C08G/C08L/C08F (26, 26, 25) show the oxide-sintering and polymer-electrolyte sub-literatures are present but comparatively thin, which is where narrower claim space is more likely to remain open.
Shares are the percentage of the 335 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Oxide and Polymer Solid Electrolytes with Eureka
This page is one run against one query. Ask Eureka your own question about oxide and polymer solid electrolytes and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
Composite electrolyte, lithium metal battery comprising the same, and method of preparing the composite electrolyte (US20200119395A1)
A composite electrolyte including a lithium salt; a solid electrolyte that is sulfide, oxide, or a combination thereof; and an ionic liquid, where the ionic liquid/lithium-salt mixture has a dielectric constant of about 4 to 12, and halogen-ion elution after 24-hour immersion is held below about 25 ppm by weight.Filed by Samsung Electronics, published 2020-04-16.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6096234A | Cross-linked polymer solid electrolyte, method of manufacturing cross-linked solid polymer electrolyte, compo… | 101 |
| 2 | US4957673A | Multilayer ceramic oxide solid electrolyte for fuel cells and electrolysis cells and method for fabrication t… | 99 |
| 3 | CN103117413A | 一种氧化物固体电解质材料及其制备方法与应用 | 84 |
| 4 | US5362493A | Preparation of redox polymer cathodes for thin film rechargeable batteries | 64 |
| 5 | US20150044575A1 | Solid electrolyte and all-solid state lithium ion secondary battery | 63 |
| 6 | CN107732295A | 一种基于卤化锂掺杂的氧化物固体电解质及其低温烧结方法 | 56 |
| 7 | US5057362A | Multilayer ceramic oxide solid electrolyte for fuel cells and electrolysis cells | 45 |
| 8 | US6316563B2 | Thermopolymerizable composition and use thereof | 43 |
| 9 | CN108598560A | 复合固体电解质及其制备方法和应用 | 38 |
| 10 | US6025437A | Block-graft copolymer, self-crosslinked polymer solid electrolyte and composite solid electrolyte manufacture… | 38 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this corpus; read them as markers of foundational influence, 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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Three patterns stand out once the raw counts are put side by side: where filing volume actually sits, which office controls access, and how citation age should be read.
China is the primary gatekeeper office
With 224 of 335 families routed through the China patent office against 39 in the US and 27 at the EPO, a freedom-to-operate check that skips Chinese filings misses the majority of the active claim space in this field.
This is a battery landscape, not a ceramics one
H01M coverage at 328 of 335 records dwarfs C04B ceramics (38) and the polymer classes (25-26 each), meaning most claims are anchored to cell architecture and performance rather than to standalone material synthesis.
Growth has flattened after a 2022-2025 run-up
Filings rose steadily from 5 in 2017 to 35 at the 2022 midpoint and on to a peak of 59 in 2025; the flat trajectory around the midpoint suggests the field is past its earliest land-grab phase, with the 2026 partial count still to be revised upward as publication catches up.
The most-cited art predates the current filing wave
The highest-cited records in the corpus, including US6096234A and US4957673A, are decades old and accumulate citations simply by virtue of tenure; they mark foundational technique, not where current competitive activity is concentrated.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to oxide and polymer solid electrolytes, with the prior art for and against each one.
Who is filing, and where momentum has stalled
Cumulative filing counts and recent-year momentum tell different stories here: several assignees with strong historical totals show no filings in the latest tracked year, which changes how a competitive-watch list should be built.
Two large filers went to zero in the latest year
LG Energy Solution and Samsung Electronics both show 0 filings in the latest year with -100% YoY change, a sharp drop from their historical presence in this corpus that is worth checking against publication lag before assuming a real strategic pullback.
A tight rare-earth-materials cluster co-files repeatedly
Xiong'an Rare Earth Functional Materials Innovation Center and Grirem-affiliated entities appear together across the strongest co-assignee pairs (6 and 5 shared filings respectively), pointing to a coordinated materials-supply filing strategy rather than independent competitors.
Historical leaders are not the current active filers
Six of the assignees tracked for recent-year momentum, including Chongqing Taillion New Energy and Litian Muxi Battery Materials, show zero filings in the latest year, suggesting current competitive activity may be shifting toward assignees not yet visible in the historical leaderboard.
| Assignee | Recent year | YoY |
|---|---|---|
| LG Energy Solution | 0 | -100% |
| Paiotrek Co., Ltd. | 0 | — |
| Samsung Electronics Co., Ltd. (Korea) | 0 | -100% |
| Xiong'an Rare Earth Functional Materials Innovation Center Co., Ltd. | 0 | — |
| Chongqing Taillion New Energy Co., Ltd. | 0 | — |
| Liyang Tianmu Xiandao Battery Materials Technology Co., Ltd. | 0 | -100% |
| Grirem Advanced Materials Co., Ltd. | 0 | — |
| Resonac Holdings Corporation | 0 | — |
Where to take this analysis
The trend and assignee data point to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking, or identifying open claim space.
Check China filings first
With two-thirds of families filed in China, any clearance search that starts elsewhere is working from an incomplete picture of this field.
Explore China filings in EurekaVerify momentum drops against lag
Several large historical filers show zero recent-year activity; before reading that as a strategic exit, confirm it is not simply publication lag catching up.
Track assignee momentum in EurekaProbe the thinner IPC branches
Ceramics and polymer-chemistry classes carry far fewer filings than the battery core, which is where narrower, more defensible claims may still be available.
Search white space in EurekaCommon questions about this landscape
Oxide solid electrolyte patents, such as those built around garnet LLZO chemistry, typically claim ceramic compositions and sintering processes and fall under IPC classes like C04B alongside the core battery class H01M. Polymer solid electrolyte patents instead claim polymer compositions or condensation chemistries, landing in C08L, C08G or C08F. In this dataset both routes are frequently combined into composite-electrolyte claims that sit in H01M, which explains why H01M covers 328 of the 335 tracked families regardless of the underlying material family.
The ranking of assignees by cumulative filings is rendered in the players table on this page, but the more useful read is momentum, not just totals. Several assignees with strong historical filing counts, including LG Energy Solution and Samsung Electronics, show zero filings and -100% year-over-year change in the latest tracked year, so a leadership picture built purely on cumulative counts can understate who is actually active now.
Filings grew from 5 in 2017 to 35 at the 2022 midpoint and on to a peak of 59 in 2025, but the growth curve flattened around the middle of that period rather than accelerating continuously. This pattern is typical of a field moving past its earliest exploratory phase into consolidation, where fewer new entrants file foundational claims and more activity shifts to refinements. The apparent drop in 2026 should be read cautiously, since publication lag of roughly 18 months means the most recent year is always undercounted at the time of any snapshot.
The thinnest claim density relative to the core battery classes sits in the ceramics and polymer-chemistry subclasses: C04B ceramics carries only 38 of 335 records, and the polymer classes C08G, C08L and C08F each carry 25-26. Within those, narrower process claims such as low-temperature sintering aids for garnet LLZO, grain boundary engineering techniques, and composite oxide-polymer interphase design appear less crowded than broad composite-electrolyte claims filed under H01M. Any freedom-to-operate search should still check China filings first, since 224 of 335 families were filed there.
US20200119395A1, filed by Samsung Electronics and published in April 2020, claims a composite electrolyte combining a lithium salt, a sulfide and/or oxide solid electrolyte, and an ionic liquid with specified dielectric constant and halogen-ion elution limits. It matters because it sets numeric performance boundaries, particularly the sub-25 ppm halogen elution threshold, that any composite electrolyte claim in this space needs to design around or fall outside of. Because it names both sulfide and oxide solid electrolytes as alternatives, it also has broader reach than a purely oxide-specific claim would.
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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.