VRFB Electrolyte Recycling Patent Snapshot 2026
LG Chem dominates a highly concentrated, nascent patent space covering vanadium redox flow battery electrolyte recycling, holding the largest share of a corpus that spans only 16 patent families globally. Filing activity has been episodic rather than continuous, with several new entrants appearing in recent windows alongside the dominant incumbent.
LG Chem leads a tightly concentrated, early-stage field
LG Chem holds 9 patent families, the largest position in a corpus of 16 patent families in scope — a commanding lead that places it well ahead of all other filers. VRB Energy ranks second with 3 patent families, and every remaining named applicant holds a single family.
The top five filers account for 94% of the combined output of the ranked applicants visible in this query, indicating an extremely tight concentration with no meaningful second tier. The gap between LG Chem and VRB Energy is substantial, and the remaining applicants are essentially single-patent entrants.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | LG Chem Ltd | 9 | |
| 2 | VRB Energy Inc | 3 | |
| 3 | Tunghsu Technology Group Co Ltd | 1 | |
| 4 | Dalian Rongke Energy Storage Group Co Ltd | 1 | |
| 5 | Korea Institute of Geoscience and Mineral Resources | 1 | |
| 6 | Shanghai Electric (Anhui) Energy Storage Technology Co Ltd | 1 |
LG Chem’s position implies that any competitor entering this space must either design around its filings — which are concentrated in battery-system and flow-measurement branches — or pursue adjacent chemistry routes where coverage is sparse.
The most recent 18–24 months are likely under-represented due to standard patent publication lag; zero filings recorded for 2025–2026 should not be interpreted as inactivity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Episodic filing history with a recent uptick; battery-system IP dominates the technology mix
The annual trend and technology composition charts together reveal a field that emerged with a burst of activity in 2017, went largely quiet, and has recently shown signs of renewed interest. The technology mix is heavily skewed toward battery and fuel-cell system patents, with only minimal coverage in upstream chemistry branches.
Annual filing trend
A pronounced spike of 9 families in 2017 gave way to near-silence through 2021, followed by a modest 2022 revival and a 4-family uptick in 2024. The 2025–2026 zeroes reflect publication lag and should not be read as stagnation. The overall pattern is episodic rather than steadily growing.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) accounts for all 16 families, confirming that patents are framed as battery-system inventions. G01F (flow, level, and volume measuring) appears in 3 families — consistent with electrolyte monitoring sub-systems. C01G (compounds of other metals, i.e. vanadium chemistry) covers 2 families, while C22B (metal extraction and refining) and C25B (electrolytic production) each hold just 1 family, marking the chemistry-intensive branches as sparse.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Electrolyte storage unit for redox flow battery an…
The present invention relates to an electrolyte storage unit applicable to redox flow batteries and a vanadium redox flow battery including the same. The electrolyte storage unit for redox flow batteries of the present invention can be useful in minimizing a contact area of an electrolyte with the air to improve a self-discharge phenomenon of a battery and… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Electrolyte storage unit for redox flow battery an… | 6 |
| 2 | 一种具有在线电解液再生功能的液流电池系统 | 5 |
| 3 | Method for recovering capacity of vanadium redox f… | 1 |
| 4 | Method for preparing high purity vanadium solution… | 1 |
| 5 | 一种钒液流电池电解液的回收再利用装置 | 1 |
| 6 | Electrolyte storage unit for redox flow battery an… | 1 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
LG Chem
LG Chem holds 9 patent families, covering both H01M battery-system architectures and G01F flow-measurement sub-systems — indicating an integrated approach to electrolyte management rather than a narrow recycling focus. No momentum data from a prior window is available for comparison, so trajectory cannot be quantified, but the breadth of its IPC coverage signals sustained investment across multiple functional layers of the VRFB stack.
families: 9VRB Energy
VRB Energy holds 3 patent families, all classified under H01M battery-system codes. Its momentum is flagged as a new entrant, indicating that its filings have appeared in the recent window without a prior-period baseline — consistent with a company ramping into IP protection as it commercialises VRFB systems. Its Beijing-registered affiliate (VRB Energy Operations (Beijing) Co Ltd) is also recorded as a new entrant with 1 recent family, suggesting geographically distributed filing activity.
families: 3Frequently asked questions
The current landscape covers 16 patent families in scope globally, making it a small and nascent niche within the broader vanadium redox flow battery space.
LG Chem holds 9 patent families, the largest position in this landscape. VRB Energy ranks second with 3 families; all remaining named applicants hold a single family each.
China and Europe (EPO) are tied as the lead filing offices, each with 4 patent records. The United States follows with 3. South Korea, Japan, Canada, Austria, and WIPO each account for 1 record.
H01M (batteries, cells, and fuel cells) covers all 16 families, confirming that patents are primarily framed as battery-system inventions. G01F (flow and volume measuring) appears in 3 families, while C01G, C22B, and C25B each account for 2 or fewer records.
No co-applicant or joint-filing relationships are detected in the current dataset. All filers appear to be pursuing independent, proprietary research programs.
C22B (metal extraction and refining) and C25B (electrolytic production of compounds) each hold only 1 patent record, representing 4% of classified records each. These branches — covering hydrometallurgical vanadium recovery and electrochemical electrolyte regeneration — have sparse coverage relative to their technical relevance to closed-loop VRFB recycling.
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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.
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