Lithium-Sulfur Battery Binder Patent Landscape
Lithium-Sulfur Battery Binder Patent Landscape in 2026
The lithium-sulfur battery binder space is a small, highly concentrated field of 17 patent families, dominated by a tightly linked Zhejiang Juhua industrial cluster and a parallel Shengda (Soundon/Sander) energy group. Annual filing volume has eased from its 2018 peak, and China accounts for the large majority of filings, with only limited activity in Europe and the United States.
A compact, China-centric field led by two corporate clusters
The corpus comprises 17 patent families. The top four filers—Zhejiang Quzhou Jusu Chemical Industry Co., Ltd., Electrochem Plant of Zhejiang Juhua, Juhua Group Technology Center, and Soundon New Energy Technology Co., Ltd.—each hold 4 patent records, together accounting for the majority of output and reflecting tight intra-group coordination rather than broad market competition.
The top five filers hold 63% of the combined total among the hundred largest filers, a very high concentration ratio for a field this size. The gap between these leading entities and the single-record university filers is stark, indicating that industrial groups, not academia, are the primary patent producers despite the field’s relative immaturity.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. | 4 | |
| 2 | Electrochem Plant of Zhejiang Juhua Co., Ltd. | 4 | |
| 3 | Juhua Group Technology Center Co., Ltd. | 4 | |
| 4 | Soundon New Energy Technology Co., Ltd. | 4 | |
| 5 | Sander New Energy Technology Development Co., Ltd. | 4 | |
| 6 | Guoke Guanghua (Nanxiong) New Materials Research Institute Co., Ltd. | 1 | |
| 7 | Southern University of Science and Technology | 1 | |
| 8 | Hunan University | 1 | |
| 9 | Zhejiang Wanli University | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 10 | Hebei University of Technology | 1 | |
| 11 | Wuhan University of Technology | 1 | |
| 12 | Guangzhou Chemical Co., Ltd., Chinese Academy of Sciences | 1 | |
| 13 | Guoke Guanghua Shaoguan New Materials Research Institute | 1 | |
| 14 | Guoke Guanghua Fine Chemical Incubator (Nanxiong) Co., Ltd. | 1 | |
| 15 | Dalian University of Technology | 1 | |
| 16 | Suzhou Keruite Intellectual Property Agency Co., Ltd. | 1 | |
| 17 | Sichuan University | 1 |
The dominance of two corporate clusters—the Juhua fluoropolymer group and the Soundon/Sander energy group—implies that any entrant without fluoropolymer chemistry or cell-integration manufacturing capabilities will face both IP and know-how barriers in the leading technical routes.
Filings from the most recent 18–24 months are subject to publication lag and likely under-represent actual recent activity; the apparent low counts in 2024–2025 should not be treated as confirmed absence of new work. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Pulse filings since 2018, with polymer chemistry as the secondary technical layer
The annual trend and IPC composition together reveal a field that generated its first meaningful filings in 2018, produced a secondary cluster in 2021, and has since eased. The IPC mix shows that binder development straddles battery engineering and polymer chemistry.
Annual filing trend
Filing activity opened with a burst of 5 records in 2018, dropped to zero in 2020, recovered to 5 in 2021, then declined to low single digits. Given the typical 18–24 month publication lag, counts for 2024 and 2025 remain provisional and should not be read as a confirmed bottom.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) covers all 17 records, as expected for electrode binder patents. The secondary branches—C08F (addition polymers, 6 records), C08J (polymer processing, 5 records), C08L (polymer compositions, 3 records), and C09J (adhesives, 3 records)—confirm that fluoropolymer and water-borne polymer formulation chemistry is the dominant secondary technical axis.
↗ 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.
COPOLYMERISIERTES PVDF-HARZ FÜR LITHIUMBATTERIEBIN…
A copolymerized PVDF resin for a lithium battery binder and a preparation method therefor. The preparation method comprises the following steps: reacting 300-600 parts of deionized water,0.04-0.25 part of a pH buffer regulator, 85-99.5 parts of a vinylidene fluoride (VDF) monomer, 0.5-15 parts of a comonomer, 0.3-3 parts of a metallocene synergist, 0.2-1.0… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 一种锂硫电池粘结剂及其制备方法和应用 | 8 |
| 2 | 锂硫电池粘结剂及其制备、使用方法和锂硫电池 | 7 |
| 3 | 一种锂硫电池粘结剂及其制备方法与应用 | 6 |
| 4 | 锂硫电池粘结剂及其制备方法、正极浆料及其制备方法 | 6 |
| 5 | 一种具有自修复性能的锂硫电池粘结剂及其制备方法和应用 | 5 |
| 6 | 一种PVDF基聚电解质型锂硫电池粘结剂及其制备方法和应用 | 4 |
| 7 | 锂硫电池粘结剂及相应的锂硫电池正极材料、锂硫电池 | 4 |
| 8 | 水性聚氨酯树脂及利用其制备的卟啉基锂硫电池电极粘结剂 | 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.
What the competitive structure means for R&D investment decisions
Four structural observations—lifecycle stage, concentration, collaboration patterns, and geographic spread—shape where entry or expansion is practical and where risk is elevated.
Declining phase from a modest 2018 peak
The lifecycle evidence places this field in decline: annual filings have eased back from the 2018 peak, and the recent-window growth rate stands at –62%. The field is technically still active but has not achieved the self-sustaining filing momentum seen in more mature battery chemistries. This suggests either that the core polymer binder solutions have been largely captured, or that the broader lithium-sulfur cell platform has not yet pulled through sufficient commercial demand to sustain sustained patent investment.
Lifecycle: DeclineTwo industrial clusters own the dominant positions
The top five filers hold 63% of the combined total among the hundred largest filers, and virtually all high-volume filers are members of either the Juhua fluoropolymer group or the Soundon/Sander energy group. The remaining 13 filers are universities or research institutes, each with a single patent record. This extreme concentration means the IP landscape around fluoropolymer-based binder routes is largely locked by two groups, while the academic fringe leaves many compositional approaches only partially claimed.
High concentrationIntra-group co-filing defines the collaboration structure
The most active co-filing relationships are entirely intra-group: Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. co-files with both Electrochem Plant of Zhejiang Juhua and Juhua Group Technology Center (4 co-filings each), and all three form a triangular cluster. Separately, Soundon New Energy Technology Co., Ltd. co-files with Sander Group Co., Ltd. (4 co-filings). There is no evidence of cross-cluster or industry-academia collaboration in the data, leaving open the question of whether university-originated polymer chemistries will be integrated into industrial development pipelines.
Intra-group clustersChina-dominant with thin international coverage
China is the lead jurisdiction with 13 patent records, while Europe (EPO) and the United States each account for 2 records. The thin international footprint means that outside of China, the IP landscape is largely open—providing both a lower freedom-to-operate risk for non-Chinese entrants and a lower barrier to filing original claims in EPO and USPTO jurisdictions. Any organization targeting non-Chinese markets can build IP positions with relatively little incumbent opposition.
China-centricGo 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 |
|---|---|---|
| Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. | Electrochem Plant of Zhejiang Juhua Co., Ltd. | 4 |
| Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. | Juhua Group Technology Center Co., Ltd. | 4 |
| Electrochem Plant of Zhejiang Juhua Co., Ltd. | Juhua Group Technology Center Co., Ltd. | 4 |
| Soundon New Energy Technology Co., Ltd. | Sander Group Co., Ltd. | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Juhua fluoropolymer cluster vs. Soundon energy group
The two leading clusters are technically differentiated: the Juhua entities focus on fluoropolymer (C08F/C08F214) binder chemistry, while the Soundon/Sander group concentrates on cell-level integration (H01M10, H01M4) with polymer processing (C08J3) as a secondary axis.
Zhejiang Quzhou Jusu Chemical Industry / Juhua Group
Zhejiang Quzhou Jusu Chemical Industry Co., Ltd., Electrochem Plant of Zhejiang Juhua, and Juhua Group Technology Center each hold 4 patent records and co-file as a single functional cluster, giving the group a combined dominant position. Their technical emphasis is squarely on addition polymerization chemistry (C08F2, C08F214) alongside battery cell classification (H01M10), reflecting their fluoropolymer manufacturing base. No momentum trend data is available for trajectory assessment.
patent records: 4 eachSoundon New Energy / Sander Group
Soundon New Energy Technology Co., Ltd. and Sander Group Co., Ltd. together form the second major cluster, each with 4 patent records and a co-filing relationship of 4 shared documents. Their technology focus is cell-integration-oriented (H01M10, H01M4) with polymer processing (C08J3) rather than raw polymer synthesis, suggesting they approach binder innovation from the electrode formulation and cell performance side rather than from polymer chemistry. No momentum trend data is available for trajectory assessment.
patent records: 4 eachUnder-served compositional and adhesive branches worth watching
Several IPC branches appear at low counts relative to the core H01M and C08F routes. These are observations of relative sparsity; technical and commercial value must be assessed case by case before treating them as investment targets.
C08B · Polysaccharides and derivatives
Only 1 patent record covers polysaccharide-derived binders (C08B), representing 3% of the IPC branch distribution. Natural polymer binders such as carboxymethyl cellulose and xanthan gum are widely studied in lithium-ion electrode literature as low-cost, water-processable, and mechanically adaptive alternatives to fluoropolymers. The near-absence of formal patent claims in this branch for lithium-sulfur applications means the prior-art barrier is low, and an entrant with formulation know-how in cellulose or gum chemistry could establish IP positions with limited incumbent opposition. Entry path: apply existing bio-polymer processing expertise to sulfur-cathode slurry formulations.
Search this in Eureka →C08G · Condensation polymers
Condensation polymer binders (C08G) appear in only 1 patent record at 3% share, leaving polyurethane, polyimide, and polyamide binder routes essentially unclaimed in this corpus. The single most-cited patent referencing aqueous polyurethane with porphyrin-based electrode binders confirms that this chemistry class has recognized technical value—polyurethanes offer tunable mechanical compliance and potential polysulfide-trapping functionality—but has not attracted systematic IP development. The evidence-backed inference is that condensation polymer binder routes represent a plausible entry point for organizations with polymer synthesis capabilities targeting cycle-life improvement.
Search this in Eureka →How the Juhua cluster and Soundon group differ by technical route
Strength of each leader across the main technology routes.
| Player | H01M 10 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | C08J 3 · Polymer processing & solutions | C08F 2 · Addition polymers (vinyl etc.) | C08F 214 · Addition polymers (vinyl etc.) |
|---|---|---|---|---|---|
| Juhua Group Technology Center Co., Ltd. | Strong · 4 | Moderate · 2 | Moderate · 2 | Strong · 4 | Strong · 4 |
| Electrochem Plant of Zhejiang Juhua Co., Ltd. | Strong · 4 | Moderate · 2 | Moderate · 2 | Strong · 4 | Strong · 4 |
| Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. | Strong · 4 | Moderate · 2 | Moderate · 2 | Strong · 4 | Strong · 4 |
| Sander Group Co., Ltd. | Strong · 4 | Strong · 4 | Moderate · 2 | Absent | Absent |
| Soundon New Energy Technology Co., Ltd. | Strong · 4 | Strong · 4 | Moderate · 2 | Absent | Absent |
| Guangzhou Chemical Co., Ltd., Chinese Academy of Sciences | Strong · 1 | Strong · 1 | Absent | Absent | Absent |
| Southern University of Science and Technology | Strong · 1 | Strong · 1 | Absent | Absent | Absent |
Frequently asked questions
The corpus in scope contains 17 patent families. This is a compact field compared with other battery component categories, which reflects both the early commercial stage of lithium-sulfur technology and the relatively narrow focus on binder formulations specifically.
Zhejiang Quzhou Jusu Chemical Industry Co., Ltd., Electrochem Plant of Zhejiang Juhua, Juhua Group Technology Center, and Soundon New Energy Technology Co., Ltd. each hold 4 patent records and are the top-ranked filers. The first three form a single intra-group cluster within the Juhua fluoropolymer group.
The evidence places the field in a decline stage. Annual filings peaked in 2018, recovered briefly in 2021, and have since eased back. The recent-window growth rate is –62%. Publication lag means the 2024–2025 counts are provisional, but the overall trend is downward from the peak.
China is the dominant jurisdiction with 13 patent records. Europe (EPO) and the United States each account for 2 patent records. Outside China, the IP landscape is sparse, which reduces freedom-to-operate risk for non-Chinese applicants and lowers the barrier to establishing original patent positions in those jurisdictions.
Yes. Polysaccharide-derived binders (C08B) and condensation polymer binders (C08G) each appear in only 1 patent record, representing 3% of the IPC branch distribution. Natural polymer routes such as cellulose derivatives and synthetic routes such as polyurethane or polyimide binders are sparsely covered relative to their recognized technical relevance in the broader battery binder literature.
Collaboration is entirely intra-group. Zhejiang Quzhou Jusu Chemical Industry Co., Ltd. co-files with both Electrochem Plant of Zhejiang Juhua and Juhua Group Technology Center, with 4 shared filings in each pairing. Soundon New Energy Technology Co., Ltd. co-files with Sander Group Co., Ltd. with 4 shared filings. There is no evidence of cross-cluster or industry-academia collaboration in the data.
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