每年锂电极片涂布那几个月，做粘结剂的厂就要开始头疼了。
场景是这样的：浆料刚调好，粘度看着对，上涂布机一刮，出来的膜厚薄不均；进烘箱一烘，看着还行；等辊压完一撕，活性物质成片成片往下掉。整卷极片判废，一车料几十万打了水漂。
老板把采购和工程师叫过来问：不是用的进口PVDF吗？怎么还这样？
采购翻进货记录：是进口PVDF，但这批粘度怎么跟上次不一样？
问题不复杂——你买的PVDF粘度牌号不对，或者干脆买错了料。PVDF做锂电粘结剂，分子量（对应粘度）是绕不开的关键，粘度一飘，浆料流变、涂布、粘结力全跟着飘。
今天这篇，把PVDF这个品类的全球格局、三家头部厂、副牌怎么用在电池粘结剂上，一次讲透。
PVDF是个什么料
PVDF是聚偏氟乙烯，偏氟乙烯单体聚合出来的。它跟PTFE同属氟家族，但PVDF没那么"高冷"——它能熔融加工，能注塑、能挤出、能做膜，加工性比PTFE好得多。
它的核心本事：耐化学、耐候、压电热电、还有跟电极材料亲和。做锂电粘结剂，图的就是它能耐电解液、能把活性物质粘在集流体上不掉。做光伏背板涂层、做防腐管道内衬、做压电传感器，PVDF也上。
但做锂电粘结剂，对PVDF的要求极苛刻。分子量要准，残氟离子要低，NMP里溶解性要好，跟正极材料的粘接强度要稳。差一点，极片就出问题。
全球做PVDF的，三家国外大厂把持高端
按产能口径，全球PVDF总产能约二十几万吨一年，锂电级高端市场被几家国外厂把持。下面三家是绕不开的主供。
第一家，阿科玛（Arkema）。 法国阿科玛是PVDF的老牌大厂，品牌叫Kynar。按2025年的数据，阿科玛在全球PVDF产能里占约一成八，是头号玩家。它的Kynar在锂电粘结剂里牌子响当当，Kynar Flex系列在头部电池体系里稳定供货，法国皮约、美国宾夕法尼亚、中国常熟都有基地。高端光伏和锂电应用，阿科玛是点名率高的那家。
第二家，吴羽（Kureha）。 日本吴羽化学的PVDF品牌叫KF Polymer。按2025年数据，吴羽在全球PVDF产能里占约一成七，紧追阿科玛。吴羽的特点是高纯锂电级做得极深，鹿岛基地的高纯PVDF专供日系和韩系电池厂，跟松下、三星SDI这一类客户绑定深。它在粘结剂电化学性能优化上的积累，是行业里公认的硬功夫。
第三家，索尔维（Solvay，特种聚合物业务现属Syensqo世索科）。 这里要交代清楚：原比利时索尔维的特种聚合物业务，后来分拆成了一家叫Syensqo（世索科）的公司独立运营，PVDF品牌叫Solef。按2025年数据，这家在全球PVDF产能里占约一成五。Solef在动力电池和高端光伏里占重要位置，耐化学和热稳定性口碑好。
再往后是大金（Daikin），它在氟聚合物全线上都有PVDF，但份额比前三家小一档。这三家加起来，把全球高端锂电级PVDF的大半占了。
副牌通识：PVDF副牌飘在哪
副牌的道理通用：同一厂家同一牌号，出厂检验个别指标没踩中正牌下沿，就是副牌。四大来源——开停车头尾料、牌号切换过渡料、正常生产中分子量/粘度/纯度小幅飘移的批次、副线尾料。它还是原厂原生树脂，分子链跟正牌同源。
PVDF做粘结剂，副牌飘的指标恰恰是尤其要命的那几项：一是分子量（对应NMP里的粘度），二是纯度和残氟离子，三是溶解性能。做粘结剂的件，对这三项零容忍。
但PVDF不只做粘结剂。做防腐涂料、做管道内衬、做光伏背板涂层，这些应用对粘度飘一点不敏感，副牌完全能上。
边界还是那条：正牌全达标、批次稳；副牌个别指标小幅飘、基材同源；回料是边角料再造粒；再生料是废旧回收。锂电级PVDF因为贵，市面上拿涂料级副牌冒充粘结剂级的事不少，务必分清应用等级。
阿科玛Kynar的副牌，涂料和内衬怎么用
阿科玛Kynar的副牌，主要飘在分子量和纯度上。
做建筑涂料、做防腐管道内衬，这些应用对粘度差一点不敏感，Kynar副牌很能打。做锂电粘结剂，对分子量和纯度要求苛刻，用正牌，别拿副牌省那点料钱。Kynar副牌大包装为主，进涂料厂和管材厂料仓。
吴羽KF Polymer的副牌，量小价高
吴羽KF Polymer本身产能不大，高纯锂电级占比高，副牌流出量有限。它的副牌多用于非粘结剂的涂层和内衬应用。遇到KF Polymer副牌，先确认是哪个等级，别拿涂层级去冲粘结剂。
索尔维Solef的副牌，备份料合适
Solef的副牌，多用于防腐和光伏涂层的备份供应。主供用正牌，辅线用副牌分流非粘结剂件。Solef副牌换上去不用大改配方，验一遍粘度就能上机。
副牌选购避坑：PVDF三件事
第一，分清应用等级。粘结剂级、涂料级、内衬级，对粘度和纯度要求差一个量级，别混用。
第二，分子量和粘度先验。做粘结剂的副牌进厂，NMP里溶解粘度必须留样测，别只看商家保证。
第三，包装分大小。PVDF副牌大包装小包装都有，小包装打样，大包装量产。
科隆仓库现货｜PVDF防盗
主推品牌：阿科玛Arkema（Kynar/Kynar Flex）、吴羽Kureha（KF Polymer）、世索科Syensqo（Solef）。
主要牌号：Kynar、KF Polymer、Solef系列。
包装规格：大包装、小包装都有，小包装试机打样，大包装、吨包料量产摊薄。
仓库现货：PVDF副牌仓库现货通常在5000吨左右，常年备货不断档。
其中小包副牌备货800-1000吨、箱装副牌备货300-500吨、大包料/吨包料备货3500-3900吨，按订单配比灵活出。
供应保障：先测后签，指标对上再放货。
选型口诀和一个真实案例
做PVDF副牌选型，记住这五条：一看件是粘结剂还是涂料，二认准Kynar/KF Polymer/Solef牌子，三验粘度和纯度，四按批量选大小包装，五留批次留样。
说个案例。大庆有家做锂电正极粘结剂的厂，给本地电池厂供PVDF浆料，之前一直用阿科玛Kynar正牌，一吨料十几万，浆料成本压不下来。换过一批便宜的PVDF上机，结果粘度不对，浆料一涂就流挂、烘干后粘结力掉档，一整卷极片当场判废，损失不小。后来我们给它配了阿科玛同牌号的副牌，但用在它的防腐涂料线，粘结剂线继续走正牌，涂料线用副牌分流。调整之后，涂料线材料成本降了一截，粘结剂线的极片良率稳在九成五以上，两条线互不干扰。
这就是PVDF副牌的用法——不是粘结剂线硬上副牌，是把对粘度不敏感的涂层件分流出去。宁波市科隆新材料有限公司做进口副牌多年，PVDF这类新能源料，类似的分流配比每年调不少，说白了就是帮你把粘结剂线的粘结力和成本，在量产之前锁死。
Every year during the few months when lithium electrode sheets are being coated, the manufacturers of binders start to get headaches.
The situation is like this: The slurry has just been prepared, the viscosity looks right, but when it is applied on the coater, the film thickness comes out uneven; after entering the oven for drying, it looks fine; but once it is rolled and peeled, the active material comes off in sheets. The entire roll of electrodes is judged as scrap, and tens of thousands of units of material from one batch are wasted.
The boss called over the purchasing staff and engineer and asked: 'Aren't we using imported PVDF? How come it's still like this?'
Purchase and incoming goods record: It is imported PVDF, but why is the viscosity of this batch different from the last time?
The problem is not complicated—you bought the wrong grade of PVDF viscosity, or you simply bought the wrong material. When making lithium battery binders with PVDF, the molecular weight (corresponding to viscosity) is an unavoidable key factor. If the viscosity fluctuates, the slurry rheology, coating, and adhesion will all fluctuate accordingly.
Today's article will thoroughly explain the global landscape of the PVDF category, how three leading manufacturers and sub-brands are used in battery binders.
What kind of material is PVDF?
PVDF is polyvinylidene fluoride, polymerized from vinylidene fluoride monomers. It belongs to the same fluorine family as PTFE, but PVDF is not as "aloof"—it can be melt-processed, injection molded, extruded, and made into films, with much better processability than PTFE.
Its core capabilities: chemical resistance, weather resistance, piezoelectric and thermoelectric properties, and compatibility with electrode materials. When used as a lithium battery binder, the point is that it can withstand the electrolyte and stick the active material to the current collector without falling off. For photovoltaic backsheet coatings, corrosion-resistant pipeline linings, and piezoelectric sensors, PVDF is also used.
But making lithium battery binders requires very strict standards for PVDF. The molecular weight must be precise, the residual fluorine ions must be low, it must dissolve well in NMP, and the adhesion strength with the cathode material must be stable. If it's slightly off, the electrode sheet will have problems.
Globally, for PVDF production, three major foreign companies dominate the high-end market.
Based on production capacity, the global PVDF total capacity is about more than 200,000 tons per year, and the high-end lithium battery market is dominated by a few foreign manufacturers. The following three are the main suppliers that cannot be bypassed.
The first one, Arkema. France's Arkema is a long-established major manufacturer of PVDF, with the brand name Kynar. According to 2025 data, Arkema accounts for about 18% of global PVDF production capacity, making it the top player. Its Kynar brand is well-known in lithium battery binders, and the Kynar Flex series maintains stable supply in leading battery systems. Arkema has bases in Puyoo, France, Pennsylvania, USA, and Changshu, China. In high-end photovoltaic and lithium battery applications, Arkema is the highly frequently mentioned company.
The second company is Kureha. The PVDF brand of Japan's Kureha Chemical is called KF Polymer. According to 2025 data, Kureha accounts for about 17% of the global PVDF capacity, closely following Arkema. Kureha's characteristic is that it has developed extremely high-purity lithium battery-grade PVDF, with the high-purity PVDF from the Kashima plant exclusively supplied to Japanese and Korean battery manufacturers, deeply tied with customers like Panasonic and Samsung SDI. Its accumulated expertise in optimizing the electrochemical performance of binders is widely recognized as a substantial strength in the industry.
The third company, Solvay (its specialty polymers business is now Syensqo). It should be clarified here: Solvay's original specialty polymers business in Belgium was later spun off into an independent company called Syensqo, and the PVDF brand is called Solef. According to 2025 data, this company accounts for about 15% of global PVDF capacity. Solef plays an important role in power batteries and high-end photovoltaics, and has a good reputation for chemical resistance and thermal stability.
Next is Daikin, which has PVDF across its entire fluoropolymer lineup, but its market share is one level smaller than the top three. The top three together account for most of the global high-end lithium battery-grade PVDF.
Side Brand General Knowledge: Where Does the PVDF Side Brand Float
The principles of secondary-grade products are generally applicable: if the same manufacturer and the same grade have individual indicators that miss the lower limit of the standard product during factory inspection, it is considered secondary-grade. The four main sources are: leftover material from machine startup and shutdown, transition material from grade switching, batches with slight variations in molecular weight/viscosity/purity during normal production, and leftover material from secondary lines. It is still the original factory's native resin, with molecular chains originating from the same source as the standard product.
Using PVDF as a binder, the indicators where secondary brands fall short are precisely the ones that are particularly critical: first, molecular weight (corresponding to viscosity in NMP); second, purity and residual fluoride ions; third, solubility performance. For parts made with a binder, there is zero tolerance for these three items.
But PVDF is not only used as a binder. For applications like anti-corrosion coatings, pipe linings, and photovoltaic backsheet coatings, these uses are not sensitive to slight viscosity fluctuations, and secondary brands can fully be used.
The boundaries are still the same: the genuine brand fully meets standards and has stable batches; the secondary brand has minor fluctuations in some indicators but the base material is from the same source; reclaimed material is made from edge scraps re-granulated; recycled material is collected from waste. Since lithium battery grade PVDF is expensive, it is common in the market for the secondary grade of coating to be passed off as binder grade, so be sure to distinguish the application grades.
How to use Arkema Kynar's sub-brands, coatings, and linings
Akoma's sub-brand of Kynar mainly differs in molecular weight and purity.
For architectural coatings and corrosion-resistant pipe linings, these applications are not very sensitive to slight differences in viscosity, so Kynar secondary brand works well. For lithium battery binders, the requirements for molecular weight and purity are strict, so use the main brand, and don't use the secondary brand just to save a little money. Kynar secondary brand is mainly available in large packages and is supplied to the storage bins of coating and pipe manufacturers.
Wu Yu KF Polymer's sub-brand, small quantity and high price
Wu Yu KF Polymer itself does not have a large production capacity, and the proportion of high-purity lithium battery grade is high, with limited output of secondary brands. Its secondary brands are mostly used for coatings and liner applications without binders. When encountering KF Polymer secondary brands, first confirm which grade it is; do not use the coating grade for binders.
The sub-brand of Solvay Solef, suitable for backup material
Solef's secondary brand is mainly used as a backup supply for anti-corrosion and photovoltaic coatings. The main production uses the primary brand, while the secondary line uses the secondary brand to divert non-adhesive components. Switching to the Solef secondary brand doesn't require major changes to the formula; you just need to check the viscosity once before running it on the machine.
Choosing Secondary Cards to Avoid Pitfalls: Three Things About PVDF
First, distinguish the application grades. Adhesive grade, coating grade, and lining grade have an order of magnitude difference in viscosity and purity requirements, so do not mix them.
Second, priors on molecular weight and viscosity. When a secondary brand of binder enters the factory, the viscosity in NMP must be sampled and measured, not just relied on the supplier's guarantee.
Third, packaging comes in different sizes. PVDF sub-brands have both large and small packaging; small packaging is for sampling, while large packaging is for mass production.
Cologne Warehouse Spot｜PVDF Anti-theft
Main promoted brands: Arkema (Kynar/Kynar Flex), Kureha (KF Polymer), Syensqo (Solef).
Main grades: Kynar, KF Polymer, Solef series.
Packaging specifications: Both large and small packages are available. Small packages are for trial runs and sampling, while large packages and ton bags are for mass production dilution.
Warehouse stock: PVDF secondary brand warehouse stock is usually around 5,000 tons, with continuous inventory throughout the year.
Among them, 800-1000 tons of small-package secondary brand stock, 300-500 tons of boxed secondary brand stock, and 3500-3900 tons of large-package/material-by-ton stock are prepared, and they are flexibly dispatched according to the order ratio.
Supply Guarantee: Test first, sign later; release goods only after the indicators match.
Selection mnemonic and a real case
When choosing a PVDF secondary brand, remember these five points: first, check whether the material is a binder or a coating; second, recognize the brands Kynar/KF Polymer/Solef; third, check viscosity and purity; fourth, choose the packaging size according to batch size; fifth, keep samples from each batch.
I'll give an example. There is a factory in Daqing that produces lithium battery cathode binders, supplying PVDF slurry to local battery factories. They had been using genuine Arkema Kynar, costing over a hundred thousand yuan per ton, and couldn't reduce the slurry cost. They tried a batch of cheaper PVDF on the production line, but the viscosity was off, the slurry would sag immediately after coating, and the adhesive strength dropped after drying. An entire roll of cathode sheets was scrapped on the spot, causing a considerable loss. Later, we provided them with a secondary brand of the same Arkema grade for their anti-corrosion coating line, while the binder line continued using the original brand. The coating line used the secondary brand for diversion. After the adjustment, material costs for the coating line dropped significantly, the cathode yield of the binder line remained above 95%, and the two lines did not interfere with each other.
This is how secondary grades of PVDF are used—not forcing the binder line to use the secondary brand, but diverting components that are not sensitive to viscosity. Ningbo Kelong New Materials Co., Ltd. has been producing imported secondary brands for many years. For new energy materials like PVDF, the diversion ratios are adjusted frequently every year. Simply put, it helps you lock in the adhesive strength and cost of the binder line before mass production.
