Organic polysulfides are linear sulfur chains (R–S–R, n ≥ 2) capped with organic moieties, and are appealing cathode materials in lithium batteries. The theoretical capacity of polysulfides essentially relies on the length of the sulfur chains; long-chain polysulfides could store more charges than short-chain polysulfides. Herein, we report the successful synthesis of a long-chain solid organic polysulfide (SOPS) by a radical coupling method and disclose its functions as high capacity cathode materials for secondary lithium batteries. The capped, long-chain polysulfide offers the fast charge transfer and thereby enabling the better performance than the pure sulfur. The SOPS cathode reaches an initial capacity of 1166 mA h g at 750 mA g, and maintains a high capacity of 674 mA h g at 3000 mA g.
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