New Sulfur Material Enables Stable, High-Performance Lithium Batteries
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Researchers developed a stable sulfur iodide (S9.3I) material for lithium-sulfur solid-state batteries. It has superior conductivity and interfaces compared to elemental sulfur.
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S9.3I cathode delivers a high capacity of 1160 mAh g-1 and shows excellent cycling stability over 200 cycles at 100°C. It also has good rate performance.
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They attribute the good performance to the uniform distribution of polysulfides enabled by the liquid state of S9.3I during cycling and conductive matrix.
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S9.3I cathode exhibits a different reaction mechanism compared to sulfur, involving the formation of soluble polysulfide species instead of insoluble Li2S.
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The self-healing ability of the S9.3I cathode interface during cycling is a key factor enabling the high performance, by periodically melting the cathode.