Lv Rongguang, Chen Zhuo, Zhou Weihua, Zhang Lun, Sheng Lin, Yao Pengfei, Wang Feng Ryan, Hao Zhangxiang, Feng Junrun
School of Science, School of Chip Industry, Hubei University of Technology, Wuhan, Hubei, 430068, China.
Materials and Catalysis Laboratory, Department of Chemical Engineering, University College London, London, WC1E 7JE, UK.
Small. 2024 Dec;20(50):e2406635. doi: 10.1002/smll.202406635. Epub 2024 Sep 28.
Aqueous zinc ion batteries (AZIBs) stand out from the crowd of energy storage equipment for their superior energy density, enhanced safety features, and affordability. However, the notorious side reaction in the zinc anode and the dissolution of the cathode materials led to poor cycling stability has hindered their further development. Herein, ammonium salicylate (AS) is a bidirectional electrolyte additive to promote prolonged stable cycles in AZIBs. NH and CHOHCOO collaboratively stabilize the pH at the interface of the electrolyte/electrode and guide the homogeneous deposition of Zn at the zinc anode. The higher adsorption energy of NH compared to HO on the Zn (002) crystal plane mitigates the side reactions on the anode surface. Moreover, NH is similarly adsorbed on the cathode surface, maintaining the stability of the electrode. CHOHCOO and Zn are co-intercalation/deintercalation during the cycling process, contributing to the higher electrochemical performance of the full cell. As a result, with the presence of AS additive, the Zn//Zn symmetric cells achieved 700 h of highly reversible cycling at 5 mA cm. In addition, the assembled NHVO(NVO)//Zn coin and pouch batteries achieved higher capacity and higher cycle lifetime, demonstrating the practicality of the AS electrolyte additive.
水系锌离子电池（AZIBs）因其卓越的能量密度、增强的安全特性和可承受性，在储能设备领域脱颖而出。然而，锌负极中臭名昭著的副反应以及阴极材料的溶解导致循环稳定性差，阻碍了它们的进一步发展。在此，水杨酸铵（AS）是一种双向电解质添加剂，可促进AZIBs中实现更长时间的稳定循环。NH₄⁺和CH₃COO⁻协同稳定电解质/电极界面处的pH值，并引导锌在锌负极上均匀沉积。与H₂O相比，NH₄⁺在Zn(002)晶面上具有更高的吸附能，减轻了阳极表面的副反应。此外，NH₄⁺同样吸附在阴极表面，维持了电极的稳定性。CH₃COO⁻和Zn在循环过程中共同嵌入/脱嵌，有助于全电池具有更高的电化学性能。因此，在AS添加剂的存在下，Zn//Zn对称电池在5 mA cm⁻²下实现了700小时的高度可逆循环。此外，组装的NH₄V₃O₈(NVO)//Zn硬币电池和软包电池实现了更高的容量和更长的循环寿命，证明了AS电解质添加剂的实用性。
