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Self-supported VO2 on polydopamine-derived pyroprotein-based fibers for ultrastable and flexible aqueous zinc-ion batteries
Carbon Energy ( IF 20.5 ) Pub Date : 2024-02-08 , DOI: 10.1002/cey2.469 Jeong Seok Yeon 1 , Sul Ki Park 2 , Shinik Kim 3, 4 , Santosh V. Mohite 3 , Won Il Kim 1 , Gun Jang 1 , Hyun‐Seok Jang 5, 6, 7 , Jiyoung Bae 3 , Sang Moon Lee 8 , Won G. Hong 8 , Byung Hoon Kim 5, 6, 7 , Yeonho Kim 3 , Ho Seok Park 1
Carbon Energy ( IF 20.5 ) Pub Date : 2024-02-08 , DOI: 10.1002/cey2.469 Jeong Seok Yeon 1 , Sul Ki Park 2 , Shinik Kim 3, 4 , Santosh V. Mohite 3 , Won Il Kim 1 , Gun Jang 1 , Hyun‐Seok Jang 5, 6, 7 , Jiyoung Bae 3 , Sang Moon Lee 8 , Won G. Hong 8 , Byung Hoon Kim 5, 6, 7 , Yeonho Kim 3 , Ho Seok Park 1
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A conventional electrode composite for rechargeable zinc-ion batteries (ZIBs) includes a binder for strong adhesion between the electrode material and the current collector. However, the introduction of a binder leads to electrochemical inactivity and low electrical conductivity, resulting in the decay of the capacity and a low rate capability. We present a binder- and conducting agent-free VO2 composite electrode using in situ polymerization of dopamine on a flexible current collector of pyroprotein-based fibers. The as-fabricated composite electrode was used as a substrate for the direct growth of VO2 as a self-supported form on polydopamine-derived pyroprotein-based fibers (pp-fibers@VO2(B)). It has a high conductivity and flexible nature as a current collector and moderate binding without conventional binders and conducting agents for the VO2(B) cathode. In addition, their electrochemical mechanism was elucidated. Their energy storage is induced by Zn2+/H+ coinsertion during discharging, which can be confirmed by the lattice expansion, the formation of by-products including Znx(OTf)y(OH)2x−y·nH2O, and the reduction of V4+ to V3+. Furthermore, the assembled Zn//pp-fibers@VO2(B) pouch cells have excellent flexibility and stable electrochemical performance under various bending states, showing application possibilities for portable and wearable power sources.
更新日期：2024-02-10
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