We’ve just returned from PDAC and lithium is all the rage. The specialty chemical’s parabolic price spike has altered the landscape and as I predicted late last year, a crop of juniors has flocked to the space. While this is dangerous and may serve to confuse investors, it doesn’t negate the fact that the lithium demand story is real.

Given the supply tightness, elevated prices for lithium concentrate, lithium carbonate, and lithium hydroxide are going to remain a fact of life for perhaps the next 18 months. The recent binding off-take agreement Galaxy Resources (GXY:ASX) signed for 60,000 tonnes of lithium concentrate at US $600/t (FOB) with 50% of the total order value paid up front in cash ($18 million) is only the latest exciting example of a lithium market taking shape.

All of this brings us back, however, to a question we’ve discussed publicly: as the lithium mining space continues to evolve, how do you play lithium outside of investing in the miners? The difficulty arises from the fact that beyond Orocobre (ORE:ASX, ORL:TSX) there are essentially no lithium pure plays in production. Albemarle (ALB:NYSE), FMC (FMC:NYSE), and SQM (SQM:NYSE) produce a majority of the world’s lithium, but it only accounts for around 10% of their revenues. Purchasing shares in these companies and expecting a significant lift based on higher lithium prices is debatable, to say the least (though this could be argued with respect to SQM).

In recent years we have been advocates of examining entire supply chains as the sustainability of most mining assets appears set to remain questionable. We think that as deleveraging in the global economy continues and excess supplies of labor, capital, and raw materials are “soaked up”, opportunities for above average returns in the mining space will be scarce. A solution is to take a more holistic view and examine entire supply chains for later cycle opportunities where growth is supported by strong demand and margins.

One such opportunity we’re reviewing in the lithium ion battery sector is the separator business. The remainder of this note is a primer on this unique and critical piece of the lithium ion supply chain.

What is a separator?

A separator is essentially a piece of plastic, but that understates its crucial role in the functioning of a battery. The separator is a porous piece of material (typically either polyethylene or polypropylene) that allows for lithium ions to flow between the anode and cathode of the battery as well as preventing the short circuiting of the electrochemical process (separators are also used in lead acid batteries). The thickness of a separator is measured in microns. One micron is one millionth of a meter or .00004 inches. A human hair is roughly 75 microns across and the typical separator is 25 microns and below depending upon a host of factors.

Given that batteries can generate a great deal of heat during usage and charge cycles, the separator effectively “shuts down” the battery when the temperature reaches 130° C (266° F) by melting and closing the microscopic pores, blocking ion transfer in the electrolyte. Battery chemistry hinges on safety more than any other issue and so preventing the excessive heat, also known as thermal runaway is imperative. 

Source: Wikipedia

Shown below is a separator “sheet”.


The separator is also a high cost battery component, accounting for 15 to 20% of the cell cost despite being less than 5% of the cell content (when added with the electrolyte). This is in contrast to lithium chemicals only accounting for 2 to 3% of the overall battery cost, so you can see why understanding the separator business is crucial – lowering the overall separator cost can have a beneficial effect on the overall cost of the battery.

What are the two types of separators?

Separators are broken down into two types – wet and dry. A dry separator is manufactured by melting a polymer and stretching it in a single direction. This process is simpler and cheaper than that of a wet separator though dry separators are thicker due to a multi-layer structure done for safety purposes. A magnified view of a dry separator is shown below. While a cheaper solution, dry separators lack flexibility in design, limiting their use.

Source: Battery Univesrsity

When produced, wet separators are stretched in two directions and are coated in a material which is then cooled. Wet separators are higher cost, but are stronger and thinner than dry separators. This enables higher capacities and has made it the preferred separator for lithium ion batteries. Given the thinness of wet separators, the coating plays an important role and the main functions are heat resistance and adhesiveness between cathode and anode.

While we were unable to find a breakdown between wet versus dry separators in terms of market share, it is believed that the dry separators are the majority of the market owing to lower cost. However, wider adoption of electric vehicles and energy storage applications, coupled with safety advances in wet separators has this type gaining market share going forward. As is the case with other parts of the battery supply chain, scale coupled with technological advancement is key to market share.

What is the size of market and who are the main players?

The largest separator manufacturer in the world is Japan-based Asahi Kasei (3407:TYO). The company was a major global provider of wet separators and then, through its $2.2 billion purchase of Polypore in 2015 came to dominate the market for dry separators as well. 

Source: Asahi Kasei Presentation

Asahi Kasei operates several business lines and the separator business is included in its “Electronics” line. In 2015, the company reported 2 Trillion Japanese yen in net sales ($17.6 billion), 182 billion yen ($1.6 billion) of which was generated in the Electronics business line. Various reports have the company as the dominant force in the separator business with a market share in excess of 30%. When Polypore was acquired, the company had revenues of US $442 million in its Energy Storage Unit in 2014.

Of note here, however, is the fact that despite the strong forecast growth in separator demand (shown in the chart above), Asahi Kasei only generates gross margins in its Electronics business of around 9% based on the above numbers. This is not unlike the difficulty faced when analyzing lithium producers who generate 10% to 12% of their revenues from lithium and the bulk from other chemical businesses – how do you gain direct exposure here?

Owing to the complexity of the battery supply chain, there are literally dozens of other separator manufacturers, both publicly listed and privately held, many of which are based in Asia catering to both the lithium ion and lead acid battery markets. Toray, Sumitomo Chemical, Entek, and SK Innovations are some of the names with significant market share and growth plans.


As is the case with much of the lithium ion battery supply chain, the separator business is not well understood. However, if the markets for electric vehicles and energy storage products are going to grow well above global GDP (and we believe they will), then other parts of the battery supply chain must grow along with it. Given the vital role the separator plays in making sure a battery operates safely and for a suitably long life, a clearer understanding of the challenges, growth dynamics, and players in this market is a must.


Chris Berry
President of House Mountain Partners LLC and Co-Editor of Disruptive Discoveries Journal

Chris Berry is a well-known writer, speaker, and analyst. He focuses much of his time on Energy Metals – those metals or minerals used in the generation or storage of energy. He is a student of the theory of Convergence emanating from the Emerging World and believes it will have profound effects across the globe in the coming years. Active on the speaking circuit throughout the world and frequently quoted in the press, Chris spent 15 years working across various roles in sales and brokerage on Wall Street before shifting focus and taking control of his financial destiny.He is also a Senior Editor at Investor Intel. He holds an MBA in Finance with an international focus from Fordham University, and a BA in International Studies from The Virginia Military Institute. Please visit and for more information and registration for free newsletter as well as his disclaimer.  

Our Thinking and What We Do

We are believers in the theory of Convergence. As the quality of life between East and West slowly merges due to advances in technology, continued urbanization, and    changing demographics, opportunities across numerous industries will arise which we can take advantage of. We aim to point out the strategic opportunities in the commodity space which arise from these themes. 

Throughout history, no society has sustained a higher quality of life without access to cheap commodities or materials. As global population increases, putting stresses on resource availability, efficiency and technology must come to the fore to continue to provide for a higher quality of life.  The looming convergence of lifestyles between the emerging world and the developed world is a fact we must all understand and accept in order to chart a sustainable path forward for humanity.

The material herein is for informational purposes only and is not intended to and does not constitute the rendering of investment advice or the solicitation of an offer to buy securities. The foregoing discussion contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 (The Act).  In particular when used in the preceding discussion the words “plan,” confident that, believe, scheduled, expect, or intend to, and similar conditional expressions are intended to identify forward-looking statements subject to the safe harbor created by the ACT.  Such statements are subject to certain risks and uncertainties and actual results could differ materially from those expressed in any of the forward looking statements.  Such risks and uncertainties include, but are not limited to future events and financial performance of the company which are inherently uncertain and actual events and / or results may differ materially.  In addition we may review investments that are not registered in the U.S. We cannot attest to nor certify the correctness of any information in this note. Please consult your financial advisor and perform your own due diligence before considering any companies mentioned in this informational bulletin. The information in this note is provided solely for users’ general knowledge and is provided “as is”. We at the Disruptive Discoveries Journal make no warranties, expressed or implied, and disclaim and negate all other warranties, including without limitation, implied warranties or conditions of merchantability, fitness for a particular purpose or non-infringement of intellectual property or other violation of rights. Further, we do not warrant or make any representations concerning the use, validity, accuracy, completeness, likely results or reliability of any claims, statements or information in this note or otherwise relating to such materials or on any websites linked to this note. I own no shares in any companies mentioned in this note and have no relationships with any other companies mentioned. The content in this note is not intended to be a comprehensive review of all matters and developments, and we assume no responsibility as to its completeness or accuracy. Furthermore, the information in no way should be construed or interpreted as – or as part of – an offering or solicitation of securities. No securities commission or other regulatory authority has in any way passed upon this information and no representation or warranty is made by us to that effect. For a more detailed disclaimer, please click here.

[Rockstone sourced cover picture here]

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