Lithium-Sulfur Battery Patent Landscape 2026
Lithium-Sulfur Battery Patent Landscape in 2026
The lithium-sulfur battery field is heavily concentrated, with the top five filers among the hundred largest applicants accounting for 52% of that group’s combined total, and LG Energy Solution and the CATL family holding the top two positions. The field is still expanding on a multi-year basis (15% recent growth), though annual volume has eased from its 2022 peak, consistent with a maturing but actively contested technology.
LG Energy Solution and CATL dominate a highly concentrated field
LG Energy Solution leads the
The top five filers hold 52% of the combined total among the hundred largest applicants, pointing to a pronounced two-tier structure: a dense cluster of Korean and Chinese battery majors at the top, then a sharp drop to a mid-tier of automotive OEMs, materials specialists, and university spin-outs.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | LG Energy Solution Ltd. | 2,522 | |
| 2 | Contemporary Amperex Technology (Hong Kong) Limited | 2,041 | |
| 3 | Samsung SDI Co., Ltd. | 778 | |
| 4 | Contemporary Amperex Technology Co., Ltd. (CATL) | 627 | |
| 5 | Honeycomb Battery Co. | 392 | |
| 6 | LG Chem Ltd. | 269 | |
| 7 | Samsung Electronics Co., Ltd. | 249 | |
| 8 | PolyPlus Battery Co. Inc. | 239 | |
| 9 | Robert Bosch GmbH | 226 | |
| 10 | GM Global Technology Operations LLC | 213 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | KOREA ADVANCED INST OF SCI & TECH | 149 | |
| 12 | Lyten Inc. | 129 | |
| 13 | Hyundai Motor Co., Ltd. | 122 | |
| 14 | Central South University | 121 | |
| 15 | Hanyang University Industry-University Cooperation Foundation | 120 | |
| 16 | Jiangsu Contemporary Amperex Technology Ltd. | 113 | |
| 17 | International Academy of Optoelectronics at Zhaoqing, South China Normal University | 110 | |
| 18 | Tsinghua University | 104 | |
| 19 | Asahi Kasei Battery Separator Corporation | 96 | |
| 20 | SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION | 96 |
The leaders’ positions reflect vertically integrated strategies — cell chemistry, electrode materials, and pack-level engineering all covered — which raises the barrier for pure-play entrants lacking cross-disciplinary portfolios.
Patent records from approximately the last 18–24 months are still working through publication pipelines, so the apparent dip in 2024–2026 data reflects that lag rather than any real slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filings peaked in 2022; battery-cell chemistry dominates the technology mix
Two charts frame the field’s trajectory and composition: annual filing volume from 2017 onward, and the distribution of activity across IPC technology classes.
Annual filing trend
Filings grew from 1,174 in 2017 to a peak of 1,929 in 2022, then eased to 1,887 in 2023. The figures for 2024 (1,306) and 2025 (856) are substantially understated due to normal publication lag and should not be read as a sustained decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) is overwhelmingly dominant. Adjacent classes — C01B (non-metallic elements and inorganic compounds), B82Y (nanotechnology applications), H01G (capacitors), and H02J (power supply and grid systems) — each hold comparatively small shares, signalling where activity is sparse relative to the core.
↗ 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.
Positive electrode for lithium sulfur battery and …
A positive electrode for a lithium sulfur battery and a lithium sulfur battery include a positive active material wiith a particle size D (v, 50%) of 10 mum or less, or has an average surface roughness Ra of 5 mum. The positive active material is selected from elemental sulfur (S8), a sulfur-based compound, and a mixture thereof. (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Protective coatings for negative electrodes | 756 |
| 2 | Liquid electrolyte lithium-sulfur batteries | 426 |
| 3 | Materials for solid state electrolytes and protect… | 398 |
| 4 | Plating metal negative electrodes under protective… | 396 |
| 5 | Rechargeable positive electrode | 379 |
| 6 | Graphene foam-protected anode active materials for… | 360 |
| 7 | Rechargeable positive electrodes | 345 |
| 8 | Layered arrangements of lithium electrodes | 339 |
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.
What the patent structure means for R&D investment decisions
Four structural readings — maturity, concentration, collaboration, and geography — translate the data into decision-relevant signals for teams evaluating where and how to enter or deepen investment.
Field is at a mature, plateau stage
Annual filings plateaued near the 2022 peak and have not resumed growth. The field still shows positive growth over the recent multi-year window (+15%), but the plateau signals that foundational cell-chemistry patents are largely staked out. R&D differentiation now requires targeting adjacent materials or system-integration angles rather than core cell architecture.
Lifecycle: MaturityTwo-tier structure with a wide gap below the top five
The top five filers hold 52% of the combined total among the hundred largest applicants. Samsung SDI (778 patent families) sits in a solid third position, but the gap to CATL (627) and Honeycomb Battery (392) below it is already meaningful. Entrants without large-scale filing programmes face significant prior-art density in the core H01M space.
High concentrationSamsung SDI–Samsung Electronics leads co-filing; LG group clusters with Korean universities
The most active co-filing pair is Samsung SDI and Samsung Electronics (108 joint patent families), reflecting intra-group integration. LG Energy Solution co-files extensively with Seoul National University R&DB Foundation (70 families) and Korea Advanced Institute of Science and Technology (50 families), while LG Chem links to KAIST (52) and Ulsan National Institute of Science and Technology (20). Robert Bosch and the Chinese Academy of Sciences Institute of Chemistry are also notable cross-sector collaborators (16 families).
Ecosystem co-filingUS and China nearly tied as primary filing offices; Europe a strong third
The United States (4,594 records) and China (4,550 records) are effectively tied as the largest filing offices, with Europe (EPO, 3,419) close behind. South Korea (1,014) and WIPO PCT (961) round out the top five jurisdictions. This broad multi-jurisdiction filing pattern among the leaders signals global commercialisation intent and means freedom-to-operate analysis must span at least three major jurisdictions.
Tri-polar geographyGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Samsung SDI Co., Ltd. | Samsung Electronics Co., Ltd. | 108 |
| LG Energy Solution Ltd. | Seoul National University R&DB Foundation | 70 |
| LG Chem Ltd. | Korea Advanced Institute of Science and Technology (KAIST) | 52 |
| LG Energy Solution Ltd. | Korea Advanced Institute of Science and Technology (KAIST) | 50 |
| LG Chem Ltd. | Ulsan National Institute of Science and Technology (UNIST) | 20 |
| LG Chem Ltd. | SOGANG UNIV RES FOUND | 18 |
| Contemporary Amperex Technology Co., Ltd. (CATL) | Jiangsu Contemporary Amperex Technology Ltd. | 16 |
| Robert Bosch GmbH | Institute of Chemistry, Chinese Academy of Sciences | 16 |
| LG Energy Solution Ltd. | LG Electronics Inc. | 14 |
| Contemporary Amperex Technology Co., Ltd. (CATL) | Shenzhen CATL Future Energy Technology Co., Ltd. | 12 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
LG Energy Solution and CATL lead; momentum diverges sharply across the tier
The top two players are differentiated by trajectory as much as by portfolio size: LG Energy Solution is consolidating a broad cell-chemistry position, while the CATL family shows accelerating recent momentum.
LG Energy Solution
LG Energy Solution holds 2,522 patent families — the largest position in the corpus — concentrated across battery cell systems (H01M 10), electrode materials (H01M 4), and battery structural components (H01M 50). Recent filing momentum is up 37% versus the prior three-year period, indicating active portfolio reinforcement rather than harvest mode.
families: 2,522Contemporary Amperex Technology (Hong Kong)
Contemporary Amperex Technology (Hong Kong) Limited ranks second with 2,041 patent families, focused on cell systems (H01M 10) and structural components (H01M 50). Its recent filing trend is 3.7× versus the prior three-year period, the strongest acceleration among the top-tier players and a signal of aggressive portfolio-building. The broader CATL group — including Contemporary Amperex Technology Co Ltd (627 families) and Jiangsu Contemporary Amperex Tech Ltd — amplifies this footprint further.
families: 2,041| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | 1,305 | ▲ +164% |
| LG Energy Solution Ltd. | 808 | ▲ +37% |
| LG Chem Ltd. | 5 | ▼ -98% |
| Samsung SDI Co., Ltd. | 110 | ▬ 0% |
| Contemporary Amperex Technology (Hong Kong) Limited | 460 | ▲ 3.7× vs prior 3-yr |
| Samsung Electronics Co., Ltd. | 13 | ▼ -78% |
| PolyPlus Battery Co. Inc. | 11 | ▼ -31% |
| GM Global Technology Operations LLC | 17 | ▼ -66% |
Under-served adjacent branches worth monitoring
Several IPC classes adjacent to the dominant H01M core show relatively sparse coverage. These observations reflect lower filing density compared to the core; technical value and entry feasibility vary and should be validated before treating any branch as a confirmed opportunity.
C01B · Non-metallic elements & inorganic compounds
With 1,356 records against a much larger H01M corpus, sulfur precursor chemistry and inorganic sulfide host materials remain comparatively sparse. Advances in elemental sulfur synthesis and sulfur-carbon composite precursors sit in this class and are directly relevant to cathode energy density — a realistic angle for materials-focused entrants or academic spin-outs with inorganic chemistry depth.
Search this in Eureka →B82Y · Nanotechnology applications
Only 797 records fall under B82Y, despite nanotechnology being a recognised route to managing polysulfide shuttle and improving electrode conductivity. Nano-structured sulfur hosts and carbon nanotube current collectors are active research areas but appear sparsely patented relative to the broader field, suggesting room for differentiated filings — particularly for groups with nano-material fabrication capabilities.
Search this in Eureka →How the leading filers differ across technology routes
Strength of each leader across the main technology routes.
| Player | H01M 10 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | H01M 50 · Batteries, cells & fuel cells | H01M 2 · Batteries, cells & fuel cells | C01B 32 · Non-metallic elements & inorganic compounds |
|---|---|---|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | Strong · 1,746 | Moderate · 412 | Strong · 988 | Absent | Absent |
| LG Energy Solution Ltd. | Strong · 1,418 | Strong · 1,287 | Emerging · 168 | Absent | Emerging · 134 |
| LG Chem Ltd. | Strong · 1,125 | Strong · 908 | Emerging · 215 | Emerging · 158 | Emerging · 106 |
| Samsung SDI Co., Ltd. | Strong · 696 | Strong · 599 | Emerging · 53 | Emerging · 65 | Absent |
| Contemporary Amperex Technology (Hong Kong) Limited | Strong · 644 | Moderate · 149 | Strong · 375 | Absent | Absent |
| Nanotek Instruments Inc. | Strong · 291 | Strong · 291 | Absent | Emerging · 30 | Emerging · 13 |
| PolyPlus Battery Co. Inc. | Strong · 225 | Strong · 185 | Moderate · 85 | Strong · 114 | Absent |
Frequently asked questions
The corpus covers 13,262 patent families in scope globally, representing R&D activity filed across all major patent offices.
LG Energy Solution leads with 2,522 patent families, followed by Contemporary Amperex Technology (Hong Kong) Limited with 2,041 patent families. Together they hold the top two positions by a significant margin over the third-ranked Samsung SDI at 778 patent families.
The United States (4,594 records) and China (4,550 records) are nearly tied as the largest filing offices, with Europe via the EPO (3,419 records) a strong third. South Korea (1,014) and WIPO PCT (961) complete the top five, reflecting the global commercialisation ambitions of the major filers.
The field shows 15% growth over the recent multi-year window, but annual volume has eased from its 2022 peak of 1,929 records, consistent with a mature, plateau-stage field. The apparent dip in 2024–2025 data is substantially a publication-lag artefact and should not be treated as a real decline.
Samsung SDI and Samsung Electronics are the most active co-filing pair with 108 joint patent families. LG Energy Solution co-files with Seoul National University R&DB Foundation (70 families) and KAIST (50 families). LG Chem also partners actively with KAIST (52 families) and Ulsan National Institute of Science and Technology (20 families).
Relative to the dominant H01M battery-cell core, the C01B class (non-metallic elements and inorganic compounds, 1,356 records) and B82Y (nanotechnology applications, 797 records) are comparatively sparse. These adjacent branches cover sulfur precursor chemistry and nano-structured host materials — areas with direct relevance to improving energy density and managing polysulfide shuttle.
Ready to map your own lithium-sulfur battery landscape?
Join 18,000+ innovators using PatSnap Eureka to map any technology landscape: search 2B+ patents and papers, surface key assignees, and generate a report like this in minutes.
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.