Electrolyte Additive Patents: Top Companies & Filing Trends 2026
- Concentrated at the top. Five companies hold 52.4% of all 531 records in scope, and ten hold 62.5% — a narrow group has occupied most of the core claim space.
- Filing has plateaued, not fallen. Filings grew only 4% from 2021 (51) to 2024 (53) — the last two years are still filling in due to publication lag, so read the recent dip with caution.
- Almost everything sits in one class. 96.4% of records carry an H01M battery classification, while adjacent classes like C07F organo-metallic compounds (7.5%) and H01G capacitors (6.0%) are comparatively thin.
Filing growth compares 2021 (51 records) with 2024 (53) — 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 531 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Electrolyte additives for solid electrolyte interphase (SEI) formation sit at the intersection of formulation chemistry and cell engineering: small-molecule or salt additives added to liquid electrolyte to control the passivation layer that forms on the anode during the first charge cycles. The 531 records in scope span formation protocols, additive consumption behaviour, gas generation during storage, high-temperature stability and additive-combination synergy — the practical failure modes that separate a lab formulation from one that survives years of cycling.
Filing activity climbed steadily from 2017, peaked in 2023 at 76 records, and has since narrowed to a small set of repeat filers who dominate the ranked total. Because publication lags filing by roughly 18 months, the most recent years in any trend chart will always look thinner than they eventually turn out to be.
Filing trend and technology composition
Two views of the same 531 records: filing activity by year, and the IPC subclasses those records carry. Because a single record can carry more than one class, the subclass shares add up to more than 100% of the record total.
Filing trend, 2017–2026
Filings rose from 14 in 2017 to a peak of 76 in 2023. Growth from 2021 (51) to 2024 (53) was +4% over the three-year span — modest expansion rather than a rush. Treat 2025 and 2026 as incomplete: publication lag means recent filings are still arriving.
Technology composition by IPC subclass
H01M (batteries, cells & fuel cells) covers 96.4% of the 531 records, confirming this is overwhelmingly a battery-cell problem rather than a general electrochemistry one. The next largest classes — C07F organo-metallic compounds at 7.5% and H01G capacitors at 6.0% — are both far smaller, and classes like G02F, C08J and H10K sit under 2% each, marking the edges of where additive chemistry is being claimed outside the core cell.
Shares are the percentage of the 531 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electrolyte Additives for SEI Formation with Eureka
This page is one run against one query. Ask Eureka your own question about electrolyte additives for sei formation and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
Film forming additive formulations of conductive polymers (US8183319B2)
An aqueous dispersion including a partially fluorinated dispersant, an electrically conductive polymer and a film forming additive. The film forming additive includes a boiling temperature greater than about 85°C. The concentration of the film forming additive is kept below its solubility limit in water, and the dispersion's dynamic surface tension is held below about 60 dynes/cm at 100 ms surface age.Filed by Samsung Electronics; granted 2012-05-22.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN103078141A | 锂离子二次电池及其电解液 | 96 |
| 2 | US20120141883A1 | Lithium-Ion Electrolytes With Improved Safety Tolerance To High Voltage Systems | 65 |
| 3 | US20190190070A1 | Silicon-based energy storage devices with carboxylic ether, carboxylic acid based salt, or acrylate electroly… | 59 |
| 4 | US4869977A | Electrolyte additive for lithium-sulfur dioxide electrochemical cell | 48 |
| 5 | US20100279155A1 | Lithium-ion battery with electrolyte additive | 47 |
| 6 | KR1020170110995A | Non-aqueous electrolyte solution and lithium secondary battery comprising the same | 46 |
| 7 | US20190181502A1 | Silicon-based energy storage devices with ether containing electrolyte additives | 42 |
| 8 | CN102386441A | 双功能型锂电池电解液添加剂及其制备方法 | 41 |
| 9 | CN109193029A | 一种高镍三元锂离子电池非水电解液及含该电解液的高镍三元锂离子电池 | 37 |
| 10 | US20160301104A1 | Electrolyte of High-Voltage Lithium-Ion Battery and High-Voltage Lithium-Ion Battery | 36 |
Citation counts inside a searched corpus favour older filings that have had more time to accumulate references — treat them as a measure of influence, not of current technical 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 ranking, trend and classification data are read together.
The field is a small-group contest, not an open race
Five assignees hold 278 of the 531 records in scope, and the leader alone accounts for 108. A new entrant is filing into space where a handful of established players already hold dense, overlapping claims around formation protocols and additive combinations.
Growth has slowed to a plateau
Filings grew from 51 in 2021 to 53 in 2024 — essentially flat once the peak year of 2023 (76) is set aside. Several of the largest historical filers show 0 filings in the latest year, though that reading should be treated cautiously given publication lag.
Nearly all activity sits inside one IPC subclass
H01M dominates the dataset almost completely, while organo-metallic compound claims (C07F, 7.5%) and capacitor applications (H01G, 6.0%) represent the largest adjacent pools. Heterocyclic compound claims (C07D, 2.8%) and optical or polymer-processing crossover applications each stay under 3%.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electrolyte additives for sei formation, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Samsung SDI Co., Ltd. | Samsung Electronics Co., Ltd. (Korea) | 9 |
| Guangzhou Tinci Materials Technology Co., Ltd. | Jiujiang Tinci Materials Co., Ltd. | 4 |
| Soulbrain Co., Ltd. | Sanwa Paint Industry Co., Ltd. | 2 |
| LG Energy Solution, Ltd. | LG Chem, Ltd. | 1 |
| LG Chem, Ltd. | YU SUNGHOON | 1 |
| LG Chem, Ltd. | SON MIYOUNG | 1 |
| LG Chem, Ltd. | LEE HOCHUN | 1 |
| LG Chem, Ltd. | JEON JOOMI | 1 |
Only 10 co-assignee pairs appear across the dataset. The strongest pairing links two affiliated Samsung entities at 9 shared records; the next strongest pairings, each under 5 records, link affiliated subsidiaries of the same corporate group rather than cross-company alliances.
Who holds the claim space, and where it thins out
The ranking covers 100 companies counted by record. Filing sits heavily with a small set of battery cell and materials manufacturers; behind them is a long tail of single- or few-filing entrants.
One filer holds roughly a fifth of the dataset
The leading assignee's 108 records are more than double the fifth-place total of 19, underlining how top-heavy this field is even within the top five.
The gap narrows fast outside the leaders
Filing counts fall from 19 at fifth place to 6 at tenth, meaning the meaningful competitive set for freedom-to-operate review is smaller than the full 100-company ranking suggests.
Several leading filers show no recent activity
More than one of the largest historical assignees, including affiliated Samsung and LG entities and a major Chinese materials producer, recorded zero filings in the latest year with year-on-year drops reported at -100%. Given publication lag, this should be read as a data-recency gap rather than confirmed withdrawal.
| Assignee | Recent year | YoY |
|---|---|---|
| LG Energy Solution, Ltd. | 0 | -100% |
| Soulbrain Co., Ltd. | 0 | -100% |
| LG Chem, Ltd. | 0 | — |
| Enevate Corp | 0 | — |
| Samsung SDI Co., Ltd. | 0 | — |
| Guangzhou Tinci Materials Technology Co., Ltd. | 0 | -100% |
| DUKSAN ELECTERA CO LTD | 0 | -100% |
| Samsung Electronics Co., Ltd. (Korea) | 0 | — |
Where to take this analysis
The dataset points to a concentrated core and a thin periphery. Two follow-up steps make that actionable.
Map claims inside the top assignees' portfolios
With 62.5% of records held by ten companies, a freedom-to-operate review should start by pulling full claim sets from the ranked leaders rather than scanning the whole 531-record field at once.
Explore assignee portfolios in EurekaTest draft claims against the under-claimed branches
Capacitor-specific and organo-metallic additive chemistry show materially lower filing density than the core battery cluster, which is where a narrower, defensible first claim is more likely to clear prior art.
Run a claim novelty check in EurekaFrequently asked questions
Filing is concentrated among a small number of battery cell and materials manufacturers. The single largest assignee in this dataset holds 108 of the 531 records in scope, and the top five combined account for 52.4% of all records. Beyond the top ten, which together hold 62.5% of records, filing counts drop sharply into a long tail of single- and few-filing entrants, so most of the enforceable claim density sits with a handful of companies.
Growth has slowed to a plateau rather than continuing to climb. Filings rose from 14 in 2017 to a peak of 76 in 2023, but the three-year comparison from 2021 (51) to 2024 (53) shows only 4% growth. Because publication typically lags filing by around 18 months, 2025 and 2026 figures are still incomplete and should not be read as a decline.
The overwhelming majority, 96.4% of the 531 records, carry an H01M battery-cell classification, confirming this is primarily a battery engineering problem. Smaller pockets of activity extend into organo-metallic and non-carbon compound chemistry (C07F, 7.5%), capacitors (H01G, 6.0%), and heterocyclic compounds (C07D, 2.8%), with even smaller crossover into optical control, polymer processing and organic semiconductor applications, each under 1.5%.
The classification data points to capacitor-specific additive chemistry and organo-metallic non-carbon compound formulations as comparatively thin relative to the dominant H01M battery cluster. Heterocyclic additive combinations and high-temperature gas suppression mechanisms also carry lower filing density. These branches are worth checking against prior art before assuming the core battery-cell claim space is the only viable filing target.
Citation counts inside any searched patent corpus tend to favour older filings simply because they have had more years to accumulate references, so a highly cited record from a decade ago is not automatically more relevant than a recent one with fewer citations. In this dataset the most-cited records include filings from as early as 1989 alongside ones from 2019, reflecting that citation age gap directly. Use citation rank as a signal of historical influence and combine it with recency and assignee activity before deciding what to design around.
Research Electrolyte Additives for SEI Formation in depth with Eureka
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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.