Cation-Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery
Lilin Zhang , Yining Chen , Zongyuan Jiang , Jingwei Chen , Cong Wei , Wenzhuo Wu , Shaohui Li , Qun Xu
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (1) : 12507
Cation-Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery
Organic redox compounds are attractive cathode materials in aqueous zinc-ion batteries owing to their low cost, environmental friendliness, multiple-electron-transfer reactions, and resource sustainability. However, the realized energy density is constrained by the limited capacity and low voltage. Herein, copper-tetracyanoquinodimethane (CuTCNQ), an organic charge-transfer complex is evaluated as a zinc-ion battery cathode owing to the good electron acceptation ability in the cyano groups that improves the voltage output. Through electrochemical activation, electrolyte optimization, and adoption of graphene-based separator, CuTCNQ-based aqueous zinc-ion batteries deliver much improved rate performance and cycling stability with anti-self-discharge properties. The structural evolution of CuTCNQ during discharge/charge are investigated by ex situ Fourier transform infra-red (FT-IR) spectra, ex situ X-ray photoelectron spectroscopy (XPS), and in situ ultraviolet visible spectroscopy (UV-vis), revealing reversible redox reactions in both cuprous cations (Cu+) and organic anions (TCNQx-1), thus delivering a high voltage output of 1.0 V and excellent discharge capacity of 158 mAh g-1. The remarkable electrochemical performance in Zn//CuTCNQ is ascribed to the strong inductive effect of cyano groups in CuTCNQ that elevated the voltage output and the graphene-modified separator that inhibited CuTCNQ dissolution and shuttle effect in aqueous electrolytes.
cathode materials / cyano groups / electrochemical activation / organic charge-transfer complex / zinc-ion battery
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2022 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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