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The lithium–sulfur battery (Li–S battery) is a type of rechargeable battery, notable for its high specific energy.[1] The low atomic weight of lithium and moderate weight of sulfur means that Li–S batteries are relatively light (about the density of water). They were used on the longest and highest-altitude solar-powered aeroplane flight in August 2008.[2]

Lithium–sulfur batteries may succeed lithium-ion cells because of their higher energy density and reduced cost from the use of sulfur.[3] Currently the best Li–S batteries offer specific energies on the order of 500 W·h/kg, significantly better than most lithium-ion batteries, which are in the range of 150 to 250 W·h/kg. Li–S batteries with up to 1,500 charge and discharge cycles have been demonstrated.[4] As of early 2014, none were commercially available.[5] The key issue of Li–S battery is low electrical conductivity of sulfur cathode needing an extra mass for a conducting agent and the current research focus is to find highly conductive cathodes.[6]

The main challenges of Li-S batteries is the low conductivity of sulfur and its massive volume change upon discharging and finding a suitable cathode is the first step

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