There are currently over 40 million cars on Germany's roads. Only a fraction of them, around 6,400 vehicles, are powered by electric energy, according to the Federal Ministry of Transport, Building and Urban Development. The comparatively short range of electric cars doesn't help their popularity, with drivers often having to start the search for a charging station after a mere 100 kilometers, not to mention the high price of the batteries, which cost several thousand euros. Remedying this situation has researchers looking at new options in developing more efficient technologies. An extremely promising avenue of research is the lithium-sulfur battery, which is significantly more powerful and less expensive than the better-known carbon zinc batteries. Although their short lifespan has made them unsuitable for use in cars before now, this may be about to change in the foreseeable future.
Scientists at the Fraunhofer Institute for Material and Beam Technology IWS in Dresden have developed a new design that increases the charge cycles of lithium-sulfur batteries by a factor of seven. "During previous tests, the batteries scarcely crossed the 200-cycle mark. By means of a special combination of anode and cathode material, we have now managed to extend the lifespan of lithium-sulfur button cells to 1,400 cycles," says Dr. Holger Althues, head of the Chemical Surface Technology group at IWS, who is delighted with his team's breakthrough.
The anode of the team's prototype is not made from the usual metallic lithium, but from a silicon-carbon compound instead. This compound is significantly more stable, as it changes less during each charging process than metallic lithium. The more the structure of the anode changes, the more it interacts with the liquid electrolyte, which is situated between the anode and the cathode and carries the lithium-ions. This process causes the liquid to break down into gas and solids and the alkaline battery to dry out. "In extreme cases, the anode "grows" to reach the cathode, creating a short circuit and causing the battery to stop working altogether," explains Althues.
www.battery-products.com, specialized in dry cell battery manufacturing, Chung Pak was found in 1980. Its head office is based in Hongkong, with one battery products manufacturing factory located in Shunde, Guangdong, Mainland China, employing a total of approximately 1,800 professionals of battery products. Started as being a battery manufacturer, Chung Pak has now developed to have diversified of paper separator, zinc products, metal plastic parts and tools manufacturing in addition to the core battery products manufacturing business.
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