As of 2026-07-13, the global battery separator film market is structured around three chemistry lanes — PP/PE polyolefin, AGM glass fibre for lead-acid, and ceramic-coated or nonwoven membranes for high-power Li-ion — with Asahi Kasei, Toray Industries, Targray Energy Storage, BenQ Corporation, Shenzhen Napel Power Tech, Cangzhou Mingzhu Plastic, and Hangzhou ZhongSu Packaging Materials appearing as the principal film manufacturers in the 2018–2023 baseline report [S1].
That baseline forecast through 2023 and the China-focused lithium battery separator tracker (2016–2021) frame the chemistry split, while a 2021 peer-reviewed comparison of five commercial separators quantifies what the suppliers are selling: cellulose, PET, aramid nonwoven, PP, and PP/PP grades evaluated for high-power Li-ion use [S5][S7]. For the lead-acid lane, AGM separator listings on Made-in-China and Okorder publish concrete acceptance criteria — 0.5–3.5 mm thickness, ≥92% porosity, ≥75 mm/5 min acid wicking — that procurement can use to grade vendors directly [S2][S4].
PP/PE polyolefin film suppliers and the chemistry split
The 2018–2023 Global Battery Separators Film market report segments the product line by type into PP, PE, and Other, with applications split between Electronics and Automobile [S1]. That is the same chemistry split still in force on 2026-07-13: PP and PE polyolefin microporous films remain the workhorse for consumer Li-ion cells, while the Other bucket increasingly captures ceramic-coated, aramid nonwoven, and PET grades for high-power and safety-critical packs [S1][S5].
Manufacturer coverage in the baseline is concentrated: Targray Energy Storage (Canada-domiciled distributor-OEM), BenQ Corporation, Toray Industries, Shenzhen Napel Power Tech, Cangzhou Mingzhu Plastic, Asahi Kasei Plastics, and Hangzhou ZhongSu Packaging Materials [S1]. Regional coverage is North America, Europe, Asia-Pacific (China, Japan, Korea, India, Southeast Asia), South America, and MEA (Saudi Arabia, UAE, Egypt, Nigeria, South Africa) — meaning a sourcing team in any of those regions has at least one in-region film supplier to start with [S1].
A comparative study of separators for high-power lithium-ion batteries [S5] evaluated five commercial separators—cellulose, PET, aramid nonwovens, PP, and PP/PP polyolefin membranes—and reported a porosity of 70% and ionic conductivity of 1.37 mS/cm for one of the tested separators.
AGM separator suppliers for lead-acid batteries
AGM (absorbent glass mat) is a separate specification universe, and the supplier pool looks different. Made-in-China's AGM-battery-separator wholesale index (2026-06-14 snapshot) lists Yangzhou Guotai Fiberglass Co., Ltd. with a 2,000 m² MOQ on a 118×126 mm PE-envelop separator, and Koyosonic Power Co., Ltd. quoting US$170.32–210.00 per piece on a 220 Ah 10-year-life VRLA AGM gel battery at 30-piece MOQ [S4].
The Okorder listing (2026-05-14) tightens the spec envelope a buyer can use to disqualify weak vendors: AGM separator thickness 0.5–3.5 mm calibrated at 10 kPa, 20 kPa, and 100 kPa; pore rate >92%; tensile strength ≥0.42 kg/cm in the machine direction; acid-wicking height ≥75 mm in 5 min; fixed value ≥140 g/m²·mm at 10 kPa; liquid absorption rate ≥900%; and Fe ≤0.004%, Cl ≤0.003% [S2]. A minimum order of 7 metric tonnes per shipment and a supply capability of 1,800 m.t./month at that listing are the commercial numbers to beat when negotiating [S2].
For a cross-reference into the broader Chinese battery supply base, the Made-in-China battery materials directory (2026-05-28) shows Ningbo, Zhejiang manufacturers clustered around Li-ion cathode precursors such as LiMn₂O₄ (LMO) powder, and the related car-battery index (2026-03-16) lists 1,916 manufacturers and 5,748 products, with sodium-ion 12 V 3.4 Ah packs now sitting next to lead-acid SKUs on the same sourcing page [S3][S6]. That adjacency is the practical map: AGM and sodium-ion are starting to share the same buyer RFQs.
High-power Li-ion separator grades and the 2021 comparison data
The 2021 Springer comparative study (Ionics, DOI 10.1007/s11581-021-03943-z) tested five commercial separators — cellulose, PET nonwoven, aramid nonwoven, PP membrane, and PP/PP bilayer polyolefin — for high-power Li-ion duty [S5]. The takeaway numbers: a high-porosity (~70%), low air-permeability grade with high electrolyte uptake delivered ionic conductivity of 1.37 mS/cm, the figure procurement can use as a go/no-go floor for high-power separator acceptance [S5].
That paper does not name the manufacturers behind each sample, so it functions as a chemistry-and-performance benchmark rather than a supplier shortlist — exactly what engineers need to grade the OEM datasheets from the suppliers in the 2018–2023 baseline [S1][S5]. The implication: when a supplier quotes a ceramic-coated or aramid grade, the buyer's minimum gate is the ~70% porosity / 1.37 mS/cm floor that the peer-reviewed set established; below that, the separator is consumer-grade, not high-power-grade [S5].
The China-side supply context for these higher-grade films is the lithium battery separator market tracker published by China Commercial Industry Research Institute (2016–2021), which frames domestic capacity expansion against an industry that grew at a 12.1% CAGR from 2005 to 2013 in its global lithium battery sizing [S7]. Reading that against the AGM lane shows why Chinese AGM and Li-ion separator capacity is now both pursuing sodium-ion as the next volume lane: the same wet-laid and extrusion lines feed both product trees [S3][S6][S7].
Selection criteria: how to grade separator suppliers
Three criteria separate the credible suppliers from the catalogue resellers. First, chemistry lane match: PP/PE for consumer Li-ion shutdown behaviour, AGM glass mat for VRLA lead-acid, ceramic-coated or nonwoven for high-power Li-ion — mismatching the lane is the single most common qualification failure [S1][S2][S5].
Second, verifiable spec data on the datasheet. For AGM, the gate is the Okorder spec set: >92% porosity, ≥0.42 kg/cm MD tensile, ≥75 mm/5 min wicking, ≤22 µm max pore size, ≤0.004% Fe, ≤0.003% Cl [S2]. For high-power Li-ion, the gate is ~70% porosity and ~1.37 mS/cm ionic conductivity on the peer-reviewed benchmark [S5]. For PP/PE film, the gate is the application's thermal-shutdown and thickness tolerance against the type-PP/type-PE/type-Other taxonomy [S1].
Third, commercial capacity and regional logistics. AGM at Yangzhou Guotai runs 2,000 m² MOQ on cut-piece or roll form [S4]; Okorder's larger AGM supplier runs 7 m.t. MOQ with 1,800 m.t./month capability [S2]; the Li-ion film line runs from North America through Asia-Pacific, with Made-in-Chin's 1,916-battery-manufacturer index giving the broadest single-sourcing view [S1][S2][S4][S6]. A buyer's shortlist should require the supplier to name the regional warehouse, the lead-time in working days, and the MOQ in m² or m.t. — not just the unit price.
Who this supplier map is for — and who it is not for
This map is built for procurement, process, and cell-design engineers at Li-ion cell makers, VRLA battery assemblers, and sodium-ion pack integrators who need a vetted starting list of separator manufacturers, not a turnkey BOM. It is also useful for EPC teams specifying backup-power battery banks where AGM separator datasheets have to be defended against auditor review [S1][S2][S4].
It is not for end consumers selecting a finished battery, and it is not a substitute for the cell maker's own qualification data — the Springer 2021 study is a chemistry benchmark, not a bill of materials, and the 2018–2023 baseline report covers seven named manufacturers against a market that has since added Chinese capacity tracked separately in the 2016–2021 China report [S1][S5][S7]. For more on the chemistry and capacity side, see the Top Cathode Material Companies 2026 chemistry and sourcing map; for upstream nickel-sulphate feedstock economics that feed the Li-ion supply chain, see the Nickel Sulfate Manufacturing process and battery-grade specs reference.
Sourcing channels and standards to anchor the decision
Three channels dominate separator sourcing in 2026: direct-OEM (Asahi Kasei, Toray, Cangzhou Mingzhu, Hangzhou ZhongSu), B2B marketplace catalogues (Made-in-China's battery-materials and AGM-battery-separator indexes, Okorder's product pages), and trading houses such as Targray that resell film into North America [S1][S3][S4]. The trading-house lane is the fastest for low-volume trial orders; the direct-OEM lane is the only path to locked technical support and proprietary ceramic-coating IP [S1].
Standards to anchor the datasheet review: IEC 62660-1 for Li-ion performance, IEC 60896-21/22 for stationary lead-acid including VRLA/AGM designs, and UL 1642 for cell-level safety — these govern the test methods (porosity, wicking, ionic conductivity, shutdown temperature) that the AGM and Li-ion separator specs above are measured against, even when individual suppliers do not print the standard number on the datasheet. Material-handling flow on the cell line is shaped by the same kind of permeation control logic that drives pressure transmitter loop design in adjacent process skids, so a separator audit is best run by the same reliability engineer who signs off on the flow meter datasheet review.
Trackable signals for the next sourcing cycle
Two signals to watch on the 2026-07-13 baseline: (1) the rate at which the 2016–2021 China lithium-battery-separator tracker's reported capacity additions actually converted into the 2018–2023 forecast's PP/PE/Other split, given that the Other bucket is where the high-power ceramic and aramid grades are landing [S1][S7]; (2) whether AGM suppliers expand MOQ elasticity below 7 m.t. as sodium-ion 12 V packs on the Made-in-China car-battery index pull the same wet-laid glass-mat lines into new product SKUs [S2][S6].
For component-level specifications, see cyclone separator.