High purity alumina should significantly improve e-car batteries

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• “Massive increases in energy density and thus the range”

The German company Altech Advanced material works on a technology that should make electric car batteries more efficient and more durable: thanks to a nano coating of the battery anode with high–purity aluminum oxide, the initial load loss of approx. 8 percent avoided and the battery life is extended by up to 30 percent. However, these findings are still theoretical nature.

In order to bring the technology into production, the company has already received a cooperation agreement with the battery manufacturer SGL Carbon. Previously, however, another test facility must be built to gain further insights into the realizability of the project. For this, Altech Advanced Materials are currently collecting a capital increase on the stock market the financial resources – 6.5 million euros wants to redeem the company. Altech board Uwe Ahrens talked to the centralized magazine about the peculiarities of the technology and the other perspectives of his company.

The first results of a feasibility study to improve lithium-ion batteries over a coating of the anode material with high purity alumina, so-called HPA, had been “very promising”, says Ahrens. With the fresh capital wool altch soon starting to “produce first smaller quantities in a test system, provide the different battery manufacturers to test purposes and thus to use in batteries”. If the expected special features of the material are confirmed at a pre-industrial level, “we will then build a production work in a second step to supply the European market of battery manufacturers,” Announces Ahrens.

With the most exciting, the reduction of the essential cycle capacity loss would be due to relatively little effort, the capacity of a battery would increase by just over 8 percent. With a 60 kWh compactor with currently common technology, a good 5 kWh could be gained. Or otherwise expressed: the range of such an e-car would rise by a good 25 to 30 kilometers. “So there is more power available without making a serious and thus expensive change on the construction of a battery,” explains Ahrens’s advantages of the new technology. Make the coating “as so-called drop-in technology very interesting for the industry”.

Altech wants to have already developed a process and a procedure, “How to make an industrial level cheap and fast the sheath of the particles with HPA, from which the anode consists,”. Ahrens assumes that the first batches of the new anode material “produce quickly”. “Then we are not in bulk production, but a belonging step further”. The Altch board did not want to announce exact times.

“Massive increases in energy density and thus the range”

An anode nano coating with high–purity alumina would also be well with silicon, which could enable as an anode material “massive increases in energy density and thus the range”. “But silicon expands through the energy supply and the grid of the compounds becomes unstable,” as Ahrens describes one of the challenges of this technology. Here, “a coating of the composite material of graphite and silicon with HPA manifest a remedy,” says the Altech boss.

Ahrens expects future for the electromobile, “that E-cars have become significantly cheaper, have a range of well over 1000 km, which lies continuously with a few minutes and the risk of overheating of the batteries belonging to the past”. A share should also have the use of HPA.

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