Carbon Supercapacitor 'Sponge' Better than Batteries?
Researchers at the University of Texas in Austin have created a three-dimensional carbon ‘sponge’ that acts as a supercapacitor, holding a charge similar to batteries. The carbon sponge performs significantly better than traditional supercapacitors and could offer competition to lithium-ion batteries as the 21st century’s electric renaissance sees more electric vehicles on the roads and smarter, distributed energy grids being developed.
Supercapacitors operate similar to batteries, but instead of relying on a chemical reaction to store and generate electricity, they hold energy more similar to static electricity. They are capable of delivering energy at a faster rate and more efficiently than batteries. While traditional supercapacitors have been limited in the amount of energy they can store, the new carbon ‘sponge’ created by University of Texas researcher Rodney Ruoff and his team may offer increased storage potential.
The carbon ‘sponge’ supercapacitor currently has a storage capacity similar to lead-acid batteries, while retaining the higher power density and speed of delivery characterized by supercapacitors.
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The carbon sponge when viewed under a microscope looks similar to a brain, with layers of densely packed wrinkles. Therefore, the structure itself has a very large—albeit condensed—surface area. “We synthesized a new sponge-like carbon that has a surface area of up to 3,100 square meters per gram (two grams has a surface area roughly equivalent to that of a football field). It also has much higher electrical conductivity and, when further optimized, will be superb for thermal management as well,” says Ruoff.
To create the carbon material, the research team used microwaves to exfoliate graphite oxide, which was then treated with potassium hydroxide. This created a porous carbon structure, full of microscopic holes. When combined with an electrolyte, the carbon structure can hold an enormous charge. The structure’s shape was confirmed by viewing it through some of the highest resolution microscopes in the world at the U.S. Department of Energy’s Brookhaven National Laboratory. The curved, single-atom-thick walls reveal a brain-like crystalline carbon structure that may hold untold potential as the next phase in energy storage.
Itronics successfully tests manganese recovery process
Itronics - a Nevada-based emerging cleantech materials growth company that manufacturers fertilisers and produces silver - has successfully tested two proprietary processes that recover manganese, with one process recovering manganese, potassium and zinc from paste produced by processing non-rechargeable alkaline batteries. The second recovers manganese via the company’s Rock Kleen Technology.
Manganese, one of the four most important industrial metals and widely used by the steel industry, has been designated by the US Federal Government as a "critical mineral." It is a major component of non-rechargeable alkaline batteries, one of the largest battery categories sold globally.
The use of manganese in EV batteries is increasing as EV battery technology is shifting to use of more nickel and manganese in battery formulations. But according to the US Department of Interior, there is no mine production of manganese in the United States. As such, Itronics is using its Rock Kleen Technology to test metal recoverability from mine tailings obtained from a former silver mine in western Nevada that has a high manganese content.
In a statement, Itronics says that its Rock Kleen process recovers silver, manganese, zinc, copper, lead and nickel. The company says that it has calculated – based on laboratory test results – that if a Rock Kleen tailings process is put into commercial production, the former mine site would become the only primary manganese producer in the United States.
Itronics adds that it has also tested non-rechargeable alkaline battery paste recovered by a large domestic battery recycling company to determine if it could use one of its hydrometallurgical processes to solubilize the manganese, potassium, and zinc contained in the paste. This testing was successful, and Itronics was able to produce material useable in two of its fertilisers, it says.
"We believe that the chemistry of the two recovery processes would lend itself to electrochemical recovery of the manganese, zinc, and other metals. At this time electrochemical recovery has been tested for zinc and copper,” says Dr John Whitney, Itronics president.
“Itronics has been reviewing procedures for electrochemical recovery of manganese and plans to move this technology forward when it is appropriate to do so and has acquired electro-winning equipment needed to do that.
"Because of the two described proprietary technologies, Itronics is positioned to become a domestic manganese producer on a large scale to satisfy domestic demand. The actual manganese products have not yet been defined, except for use in the Company's GOLD'n GRO Multi-Nutrient Fertilisers. However, the Company believes that it will be able to produce chemical manganese products as well as electrochemical products," he adds.
Itronics’ research and development plant is located in Reno, about 40 miles west of the Tesla giga-factory. Its planned cleantech materials campus, which will be located approximately 40 miles south of the Tesla factory, would be the location where the manganese products would be produced.
Panasonic is operating one of the world's largest EV battery factories at the Tesla location. However, Tesla and other companies have announced that EV battery technology is shifting to use of nickel-manganese batteries. Itronics is positioned and located to become a Nevada-0based supplier of manganese products for battery manufacturing as its manganese recovery technologies are advanced, the company states.
A long-term objective for Itronics is to become a leading producer of high purity metals, including the U.S. critical metals manganese and tin, using the Company's breakthrough hydrometallurgy, pyrometallurgy, and electrochemical technologies. ‘Additionally, Itronics is strategically positioned with its portfolio of "Zero Waste Energy Saving Technologies" to help solve the recently declared emergency need for domestic production of Critical Minerals from materials located at mine sites,’ the statement continues.
The Company's growth forecast centers upon its 10-year business plan designed to integrate its Zero Waste Energy Saving Technologies and to grow annual sales from $2 million in 2019, to $113 million in 2025.