Sulfide Solid Electrolyte Patents: Who Leads, Where the Gaps Are 2026
Sulfide Solid Electrolyte Materials Patents: Filing Trends and Leaders
45.0% of all 4,209 records sit with just five assignees, so freedom-to-operate work should start with their claim scopes, not a broad novelty search. Annual filings rose from 140 in 2017 to a peak of 572 in 2021, then eased to 527 by 2024 – an 8% pullback over that three-year span rather than a sustained decline. 2025 and 2026 figures (down to 59 in the partial latest year) understate real activity because publication typically lags filing by around 18 months.
- 1PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD20.1%
- 2TOYOTA JIDOSHA KK10.8%
- 3IDEMITSU KOSAN CO LTD5.8%
- 4SAMSUNG SDI CO LTD4.4%
- 5GS YUASA INT LTD3.9%
See the full sulfide solid electrolyte materials analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about sulfide solid electrolyte patents
Why do sulfide solid electrolytes generate hydrogen sulfide, and how do patents address it?
Sulfide-based electrolytes react with ambient moisture to release hydrogen sulfide gas, a byproduct that is both toxic and a sign of electrolyte degradation. Patent filings address this in two main ways: composition claims that add moisture-resistant or gas-suppressing additives, such as red phosphorus in a recent Idemitsu filing, and process claims covering dry-room handling and packaging. Because this is a safety-critical property for commercial cells, expect continued filing activity in additive chemistry even as core conductivity claims mature.
Which companies hold the most sulfide solid electrolyte patents?
The assignee ranking in this dataset covers 100 companies, with the leader holding 846 records and a steep drop to 165 at fifth place and 73 at tenth. The top five assignees together account for 45.0% of all 4,209 records in scope, and the top ten reach 58.0%. That concentration means a small number of portfolios cover a large share of the field, though a long tail of smaller filers remains active in specific niches.
Is sulfide solid electrolyte patent filing still growing in 2026?
Filing volume peaked in 2021 at 572 records and had eased to 527 by 2024, an 8% decline over that three-year span – a plateau rather than a sharp drop-off. Figures for 2025 and 2026 look much lower, but that reflects the roughly 18-month lag between filing and publication rather than an actual collapse in activity. Treat 2024 as the last year with a reasonably complete picture.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Sulfide Solid Electrolyte Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.