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Lithium–sulfur batteries ready to go the distance | Chemistry World

Lithium–sulfur batteries might soon be able to take an electric car more than 300 miles on a single charge © Shutterstock
A non-stop trip from London to Paris in an eco-friendly car could soon be possible, if powered by the latest lithium–sulfur battery created by scientists in the US. The new batteries hold more than double the energy of ordinary lithium-ion batteries weight-for-weight and see little drop off in performance even after being recharged 1500 times.
Lithium-ion batteries dominate the market for electric vehicles, but aren’t able to meet consumer demand for car that can travel more than 300 miles on a single charge. Lithium–sulfur cells provide apromising alternative to conventional lithium batteries, but haven’t made it into electric cars because of the rapid deterioration of the battery.

Elton Cairns’, and colleagues at the Lawrence Berkeley National Laboratory in California, US, new battery may be the answer to the range anxiety problem that still dog electric cars. His lithium–sulfur graphene oxide cell should hold enough power for electric cars to break the 300 mile mark in a single charge. ‘The main advantages of these cells are very high specific energy, estimated to be more than 400W·h/kg versus 200W·h/kg for lithium-ion cells, high rate capability, better safety and lower cost than lithium-ion cells,’ Cairns says.

Previously, scientists have had trouble with lithium–sulfur holding less and less energy each time they’re recharged. ‘The capacity degradation is largely the result of the solubility of the intermediate reaction products, lithium polysulfides, in the electrolyte,’ Cairns explains.

More http://www.rsc.org/chemistryworld/2013/12/lithium-sulfur-batteries-ready-go-distance

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