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A Novel Cross-conjugated Polycatechol Organic Cathode for Aqueous Zinc-ion Storage.

The rapid development of aqueous zinc-ion batteries poses a challenge to the exploration of cathode materials with high capacity and long-cycle life. The organic materials are considered to be the proper choice due to their structural flexibility and tunable surface chemistry. However, most of the organic cathode materials still have some shortcomings of low electrical conductivity, high cost and limited cycling durability. Here, we reported a facile synthesis of the novel organic composite cathode of cross-conjugated polycatechol (PC) combined with graphene (PC/G) for aqueous zinc-ion storage, in which plenty of hydroxyl groups in PC/G composite cathode can be converted to the redox-active carbonyl groups at the initial discharge/charge. Such a composite cathode can deliver a high specific capacity of 355 mAh g -1 at 0.1 C and a specific capacity of 171 mAh g -1 at 10 C. Moreover, the composite cathode can remain 74.4% of initial capacity after 3000 discharge/charge cycles at 2 C. This coordination way to zinc-ion within the PC/G composite cathode can avoid the structural destruction of cathode material during discharge/charge. Such an organic cathode shows great promise for reversible zinc-ion storage, which brings the aqueous zinc-ion batteries a step closer to their future practical applications.