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DuPont Introduces New Separators for Li-ion Batteries

3 August 2010

DuPont has introduced a nanofiber-based polymeric battery separator that boosts the performance and safety of lithium-ion batteries. DuPont Energain battery separators can increase power 15 to 30%, increase battery life by up to 20% and improve battery safety by providing stability at high temperatures, according to DuPont.

The company has begun construction on a facility in Chesterfield County, Va., to manufacture product for development and commercial sale.

While the initial uses for the separator are in hybrid and electric vehicle batteries, the technology also will be targeted for batteries in renewable energy, grid applications, specialty consumer applications, including laptops, cell phones and power tools, among others. Other products made using DuPont’s proprietary nanofiber technology will target a broad range of liquid filtration applications for the biopharmaceutical, microelectronics, food and beverage industries, offering superior retention, filter life and flow resistance.

DuPont Energain battery separators are produced into a web using a proprietary spinning process that creates continuous filaments with diameters between 200 and 1,000 nanometers. The separators exhibit stability and low shrinkage in high temperatures and are highly saturable in electrolyte liquids. The result is more efficient operation, longer battery life and improved safety, according to DuPont.

Batteries containing Energain separators can be quickly recharged, deliver improved performance and reduce the number of batteries needed by up to one-third for hybrid vehicles.

DuPont is working with a majority of the battery, equipment suppliers and automotive companies globally. The company has manufactured initial quantities of the separator material at sites in Wilmington, Del., and Seoul, South Korea. The new facility in Chesterfield County, Va., is expected to start up in the first quarter of 2011 and will initially be able to provide enough material to supply up to 20% of today’s hybrid and electric vehicle needs.

August 3, 2010 in Batteries | Permalink | Comments (24) | TrackBack (0)

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This is another step towards improved performances for rechargeable batteries. With a potential 30% battery weight reduction (for comparable energy storage), PHEVs and BEVs would certainly become one step closer to reality. Electrodes will also improve year after year. Lower cost, very rugged, Solid State batteries may also become a reality by 2015.

An interesting decade ahead.

We hear about how they will all build new factories. There are so many factories shut down from U.S. automakers, you would think they could have their pick.

Is it much cheaper to recycle a non-efficient 50-year old factory than to built a new energy efficient more fire proof one?

Despite the constant cries of the left-wing Know Nothings, technological progress continues, one little step at a time...

Gee thanks Stan, that sub prime melt down is just what we needed.

Stan Peterson

California left-wing has led the innovation for the rest of the world, so you should keep your stinky words for yourself. Texan-man is very famous for the sophistication of its brain right? but also for the refinement of his lifestyle, right? and has produced many wonders that the world can now enjoy,right ? personally asides of corrupted politicians I don't see anything that Texas should be proud of.

Harvey, I think the separator increases the power density but not the energy density, at least in this case. But still, that would mean it could charge or discharge 15-30% faster. That is great because it means it could reduce rapid charge times down even more. So that 20 minute rapid-recharge time would be down to more like 13 minutes. And the power from a 24kWh pack like the Leaf just gets that much more intresting if you want performance.
And it also increases battery life which is clearly a good thing for the warranty so therefore the overall cost of the battery...because they certainly have to account for that in the price!
But I think there are also lots of good advances on energy density as well with coated silicon wires, etc.

I think by 2015 we'll see a true next generation set of batteries where at least 150 mile range will be the low end rather than today's 100miles.

Stan...do you have some kind of imbalance that causes you to start fights for no reason? Is it some kind of "argument turette's syndrome"?

What does left vs. right wing have to do with good news on the battery front?

This is a good advance and Dave's analysis is accurate. I guess some would say that we do not need U.S. battery programs, that companies like DuPont will just do what needs to be done whenever they get around to doing it, if ever.

DaveD...Thank you for the correction. I had misread power for energy density. However, other improvements will double energy density of PHEVs and BEVs battery packs from 150 Kwh/Kg to 300 Kwh/Kg before 2020. The technologies required are being tested and may be mass produced by 2015/2020.

The next step will be to double energy density one more time to 500/600 Kwh/Kg. More R&D is required but it is coming. It is essential for practical highway EVs.

Harvey was right, this could be an interesting decade. It has been said that we can do amazing things if we put out minds to it. We are about to see if that is true.

SJC: I'm not religious but I have faith in USA's ability to reverse the current downward trend, if certain essential corrections are made in a timely manner. Ways must be and will be found to reduce the enormous resources being siphoned (not to say stolen) by greedy operators. Many may not like it but more financial regulations may be required to fix it up. What we eat, drink and breath must be looked at. Many unhealthy products should be modified or taken out of the market. Otherwise, treatments will become very costly and productivity will go down.

Good luck America.

You don't have to have religion to have faith, but the last 8 years have tested mine to the breaking point. One more group of con artists and liars will break it.

Yes, unregulated free enterprises (Corporate America) may continue to sink the country and what it has stood for.

It may not be to late to stop the slide, but it is time to wake up. Inaction will bring much of the same. With powerful lobbies and almost unlimited resources, those in the profit chairs will do their best to stop the essential changes to be passed into law.

Many Billionaires want to return some (50%) of their huge accumulated profits. How many will effectively do it and how? Would building 5000+ new schools, 1000+ well equipped new hospitals, 1000+ R&D programs etc be a good way?

Harvey D,

I haven't see regulated, Governmental organizations produce a damn thing. Cars? no. Chips? No. Planes No. Computers? No. Drugs? No. Communications? No.

Chernobyl nuclear power plant designs, are an triumphal example of regulated, governmental, non-Corporate R&D. What other "successes" can you name?

Private sector has its place, but don't wait for them to do what the country needs, it is what their company needs. It is always company before country, yet we blindly wait for them to make all the moves.

SJC-

I think you misspoke. I think you meant to say "The government has it's place, but don't wait for it to do what the coutnry needs, it is what their special interests need." Take a look at who makes up our government.. wings of the same bird.

To take a step back and look at what our goals are for batteries we need to understand that the biggest hurdle to commercialization is R&D. Some firm (existing or future) will commercialize viable technology. Unethical firms do exist, but that's really the individual not the system. The best thing the government can do, which it has done since 2005 across two presidents, is to provide resources to universities and private labs in order to make these sorts of advances that we've been seeing.

No, the private sector has its place. This is a government by the people and for the people. Corporations need to pay their fair share and behave themselves.

The government is beholden to the people. Their fair share? That's not easily defined. Some might argue that a head tax would be the 'fairest' way to distribute the costs of the government's services.

I'm not suggesting that corporations should be allowed to conduct themselves unethically, but that isn't anywhere close to where our government operates. Too many markets are socialism-capitalism hybrids. Nobel Laureate Fredrich Hayek argues in 'The Road to Serfdom' that those markets are in-fact the most prone to become monopoly and oligoloply markets. I would argue the reason we're seeing so many large banks influencing markets are government policies that promote consolidation, although that's a separate issue.

The point of my previous statement is that the government is woefully inadequate when it comes to innovation and pareto efficiency.

A check and balance system is a must. Non-regulated wild free enterprise is very close to a Monopoly game. The final goal is to have one (or a few) BIG winners, to take all, regardless of who gets hurt. Look what happened in the real estate and prime markets two years ago.

Government regulations are a must and are there to stop abuses. Unfortunately, too many people accept $$ and favors to bypass or soften up regulations. Eyes wide shut is the norm in too many places.

Basically, it is in the wild unregulated free enterprise interest to make us sick so they can sell us more pills and win the Monopoly game.

The ups and downs in the Stock Market is another tool to rob many people of their savings.

Wild unregulated free enterprise and corruption could eventually sent USA on a very deep downward spin, if it hasn't already done part of it.

WE decide what fair share and good behavior are. They do business here with OUR permission.

We (the people?) may think that we decide what we do, see, hear, drive, ride, eat, drink, breathe etc but the really is often very far from that. Most important decisions are taken by very few. The rest follow. Leaders (less than 1%) change but followers (99+%) rarely do of their own doing.

Look at what teenagers are waring and eating. Do that really have the choice.

How many soldiers choose to fight in Vietnam, Irak and Agfanistan etc?

Did we really choose to fly/drive versus using ultra fast e-trains?

Dis we really choose to drive 3 to 4-ton 4x4 down town or to take the child to school?

The list could go on for pages.

i'd like to know more details about this separator. This separator should be more expensive than current PE, PP separator, which is one of critical issues for EV commercilization.
Meanhwile, i do not hink it can increase power 15~30% only by separator change, even the porosity is higher than 70%.

Along with a certificate signed links of london by the scrolling on the links of london sweetie bracelet long-sleeved two-piece suit ($55)has fashioned sequence-transmit rings as well as cuff links, a copy of course, the inevitable T-shirts with a griffin links of london sale logo. Not for links of londonbut for jogging, the shell in the exhibition Links Bracelets .

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