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Last year, the battery new company A123 system company (A123Systems) opened another company called 24M (24M), developing a new battery, wanting to make electric cars farther, lower cost. Now, a research papers published in "Advancenergy" (Advancenergy "(Advancenergy", disclosing the preliminary details, explaining how the battery works. It also overcomes the challenge of making the battery to the market.
There is a big problem, lithium-ion battery for electric vehicles and plug-in hybrid vehicles, only about 25% of the battery volume is placed in storage energy. The rest are composed of invalid materials such as packaging, conductive foils, and glue, which makes batteries, and accounts for considerable parts. 24M company intends to reduce the invalid material in the battery.
It is estimated that the battery in this new paper can achieve almost twice the energy density, which is more car battery pack today. The battery has a higher energy density, which will be smaller and cheaper, which means that electric and hybrid vehicles will be cheaper. This paper estimates that this battery cost may be less than 250 per kilowatt, lower than half of their current cost.
Traditional battery packs contain hundreds of batteries. Each battery contains many thin solid electrodes. These electrodes are equipped with a metal foil collector (CurrentCollectors), separated by plastic films.
To add energy storage, you will add more layers of electrode materials, which in turn requires more layers of metal foil and plastic film. The design of 24M company makes it possible to add energy storage, not additional metal foil and plastic film. The key difference is that the electrode is not a solid film stack in the battery, but the alkali slag material is stored in the container, one is a positive electrode material, and the other is a negative electrode.
This material is pumped into a small device from the container, and the channels they pass are engraved on the metal block. When this happens, the ion moves from one electrode to another, but also through the same diaphragm material, is the kind of for traditional batteries. Electronic will leave the material and enter the external circuit.
In this design, increasing energy storage is simple, like a new storage container, this device interacts the electrode, which can maintain the same size. This design is not connected to hundreds of batteries to get enough energy storage. This new battery is similar to one thing, called a flow battery (Flowbattery), two electrolytes are pumped, passing through each other.
However, traditional liquid flow batteries are about 10 times more than this new design because they use diluted energy storage solutions, which makes them do not actually use for automobiles. Among the researchers, the leaders were YET-MINGCHIANG. Under Professor MIT (MIT) Materials Science, the A123 system company and 24M company, researchers test various materials, for electrodes, including lithium LithiumCoBaltoxide, this is a common laptop battery.
They prove that such equipment can charge and discharge, speed in line with electric vehicles, Jiang Yeming said. In addition, how the researchers overcome the largest design challenge: Pull the charge from alkali slag. In a conventional lithium ion battery, electronically transmits the conductive particles to be skipped, in the solid electrode until they reach the current collector.
In new batteries, electrons do not flow over electrolyte. Therefore, Jiang Yingming and colleagues mixed nano-scale carbon particles, mixed into alkali; particles spontaneously formed an interconnected network, supplying pathways in fluid, allowing electron escape. The challenge still exists, it is like this before the battery is commercialized.
Electricalconducture is still about 100 times lower, this is a more practical system, Jiang Yeming said. He is still working hard to increase the concentration of active materials in alkali slag. Jeffdahn is a Professor of Physics and Chemistry, Dalhousieuniversity.
He pointed out that it is necessary to reach the power level required to drive the car. This electrochemical battery is still very large: diaphragm material ( SeparatorMaTerial) The area that must be covered by approximately 3 meters by 4 meters. It can cut into operable sheets, stacked, but this will make the system complex, that is, this kind of method, this battery may still be large, he said.
"We are improving this technology well," 24M President SroopWilder said. "I recognized this paper, I have certainly affirmed these basic principles and will promote our research and development. "24M has approximately 20 employees, has been raised about $ 16 million US dollars.
"This is a very intelligent device," Darn said. "I don't know, is this not only an idea in the paper, but Jiang Yeming has already surprised it before. ".
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