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ÏëÎÊһϣ¬Angew. Chem. Int. Ed. 2013, 52, 2 ¨C 18£¬Lithium¨CSulfur Batteries: Electrochemistry, Materials, and Prospects
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Upon discharging, S reacts with Li by a two-electron reduction
process to form polysulfide intermediates (Li 2 S x , x = 2¨C8), and
to generate Li sulfide (Li 2 S) at the end of discharge. This
process is accompanied by an increase in cathode electro-
chemical potential (Figure 1b) until the battery reaches the
terminal voltage (F, normally  1.5 V). The reverse reaction
occurs when an external electric field with a certain potential
difference is applied, leading to the decomposition of Li 2 S
back to Li and S. During this time, the cathode electro-
chemical potential gradually decreases till the battery voltage
returns to F oc (Figure 1c).

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