Algae-Based, Non-Metallic Batteries Could Revolutionize Energy Storage Industry
A group of researchers at Uppsala University in Sweden have discovered that a particular type of algae — with a bad reputation for causing damaging algal blooms in oceans throughout the world — produces a substance that can be used to make inexpensive, non-toxic, simple-to-build, flexible, thin and durable batteries that, after optimization, are expected to perform on par with today’s most advanced lithium-ion batteries.
The key to the discovery lies in the way in which the algae, Cladophora, produce a unique type of cellulose with a very large surface area (approximately 80 square meters of surface area per gram of material).
By coating this algal cellulose material with a thin layer of a well-known, conductive polymer, called polypyrrole (PPy), the team has “succeeded in producing a battery that weighs almost nothing and that has set new charge-time and capacity records for polymer-cellulose-based [non-metallic] batteries,” according to Gustav Nyström, a doctoral student in nanotechnology and one of the main researchers.
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The battery they created during the course of their experiment was completely unoptimized, yet even so they managed to obtain storage capacities of approximately 25 Wh/kilogram of battery material by weight, or 40 Wh/Liter of battery material by volume. To get an idea of what that means, lithium-ion batteries (which have been being optimized for a long time now) have a range of 100-160 Wh/kg or 250-360 Wh/Liter. After optimization, the research team expects the PPy-Cellulose batteries to have roughly the same energy storage characteristics as lithium-ion.
Up until now, no one has been able to make an organic-based battery perform anywhere close to what you expect from the best lithium-ion inorganic batteries. What’s the big deal with having an organic-based battery you ask? From ease of manufacture, to the low degree of toxicity, to the flexible nature of the material, organic-based batteries have several key advantages over inorganic ones such as lithium-ion.
According to an email from Professor Maria Strömme, one of Gustav Nyström’s advisors and another author on the paper, the battery would be very easy and cheap to make because it “mainly consists of paper and salt water and can theoretically be made in your own kitchen (if you have a strong mixer) without the major energy input needed to create today’s batteries.” In a separate email, Mr. Nyström also added that the manufacture of the battery is “based on an easy, all-chemical batch wise fabrication process using inexpensive and abundant materials.”
Although the battery can be made with ease and is quite non-toxic, it has some impressive characteristics relating to charge times and durability. Again, keeping in mind that their experimental battery was completely unoptimized, it already shows an impressive ability to be quickly charged and discharged at high Amperages over and over without losing much of its storage capacity.
The research team is not focusing directly on car applications as of yet, choosing instead to direct their energies on taking advantage of the battery’s unique properties of flexibility and low toxicity.
“We anticipate that the new batteries may open up entirely new possibilities when it comes to battery applications,” said Professor Strömme in an email. “Because of the potential cost efficiency and light weight, the batteries can be used in smart textiles (clothes, e.g. for sensors that monitors pollutants or UV irradiation or alternatively monitors our sweat for diagnostic purposes) in packaging, in diagnostic devices in developing countries, etc.. Another benefit is that the batteries can be manufactured without advanced equipment making it possible to build the batteries on site in developing countries.”
However, because the batteries are expected to perform on par with lithium-ion, and may potentially be much cheaper and less-toxic, there is no reason that they couldn’t outright replace lithium-ion as the battery of choice for all applications, including electric and extended-range vehicles.
Sources: EurekAlert, personal communication with authors, Journal article published in Nano Letters (DOI: 10.1021/nl901852h)
Image Credit: Adapted from Nano Letters journal article
Could you explain why a tenth the capacity compared to Lithium-Ion is so exciting? What reason do they have to believe it will be so much better when “optimized”?
MB,
Charge capacity is really only one part of the story here, but in answer to your question: Since when is 25/100-160 equal to 1/10? The numbers I was provided and posted above clearly show that it’s more like 1/4-1/6 the capacity of li-ion in its unoptimized state.
In order to get at what the differences between an unoptimized experimental battery and an optimized commercial battery are, all I can really do is cite their paper:
“On the basis of the results from the TGA measurements and the CHN analysis, showing that about two thirds of the composite consists of PPy, we obtain charge capacities between approximately 38 and 50 mAh per gram when only considering the electroactive material. These values may be compared with the capacity of a Li+ battery composed of a lithiated graphite (LiC6) anode and a LiCoO2 cathode of approximately 140 mAh g-1 (ref 29) as well as that of 110 mAh per gram reported by Pushparaj et al.30 for a hybrid Li+ ion/carbon nanotube-impregnated paper battery. Since the present system has not yet been fully optimized, it is reasonable to assume that this all polymer-based system may be competitive even when comparing with Li+ ion systems particularly as the present type of batteries can be used in a very wide range of applications for which Li-ion batteries clearly not will be applicable.”
However, like I said, the charge capacity is really only part of the story here. The major discovery is that a completely organic battery has been shown to have a storage capacity that is likely in the same realm as Li-ion, but can be made from readily available materials that don’t need to be mined, is far cheaper to produce, can be charged extremely quickly with little degradation, is flexible enough it could be worn in clothing or embedded in books, can be made in your “backyard,” and has very low toxicity (it’s mostly made of salt water).
YES THAT IS THE WAY TO GO! ELECTRIC RULES !
I need more universities to check their results before I comment but this is exactly where we should be spending our research money. organic nontoxic and any company can easily manufacture it without polluting. If this pans out then I’ll hug the next Swedish person i see!
A lot of investment has taken place in Lithium mining and production, I wonder what impact this will have on the market place. What conditions besides the natural ocean environment are needed to mass produce this algae? Whichever countries/organizations get the mass production running first will have an advantage.
This seems like something that falls under “Too good to be true”. And the perplexing math seems to make me doubt it more. Hopefully this is true and we get something nice out of this.
Sweet. This seems like a good replacement for Li-poly’s in RC applications.
exciting stuff. but really would like to see these batteries in the market. and then only it will be really exciting.
go switzerland - with all the banks of importance their. they have made something useful afterall. or rather discovered.
I find this one of the most exciting discoverys of all time. I want on the list as first in line to buy some stock in this company. Hoping one of the stock brokers will contact me very soon.
Could some functionality comparisons be drawn between these findings and the “algae-as-fuel” developements?