PTCDI//δ-MnO_(2)水系铵离子电池性能研究

Performance of PTCDI//δ-MnO_(2) aqueous ammonium-ion battery

以铵根离子为载流子的可充电水系铵离子电池具有诸多本征优势,然而对于其全电池的研究与探索仍然处于起步阶段。本文首次报道了PTCDI//δ-MnO_(2)铵离子电池体系。该电池采用0.5 mol/L NH_(4)Ac作为电解液,以层状δ-MnO_(2)作为正极材料,3,4,9,10-四甲酰二亚胺(PTCDI)作为有机负极,可以在0~1.5 V电压窗口内稳定工作。本文中的层状δ-MnO_(2)正极材料采用简单的KMnO_(4)热分解法制备,并通过XRD、SEM、TEM、XPS、FTIR、拉曼光谱等手段对δ-MnO_(2)纳米片正极进行了表征。实验研究结果表明,通过合理搭配PTCDI纳米粒子负极,该全电池在0.5 A/g的电流密度下循环500圈后,容量保持率仍为初始容量的92%,库仑效率接近100%,具有优异的循环稳定性。同时系统地研究了δ-MnO_(2)纳米片正极的储能机理以及PTCDI有机负极的储铵动力学特性。非原位XPS光谱结果表明NH^(4+)可以在正极材料中实现可逆地脱嵌。该全电池具有较高的电压窗口,可以较为轻松地向风扇及LED灯等常见小型电器供电,具有良好的发展前景。综上所述,新材料的开发对构建新一代安全环保的水系铵离子电池具有重要意义。

Rechargeable aqueous ammonium-ion batteries using ammonium ions as carriers have many inherent advantages;however,research and exploration of full batteries are still in their infancy.Herein,we developed a 3,4,9,10-perylenetetracarboxylic diimide(PTCDI)//δ-MnO_(2) ammonium-ion battery system.The battery uses 0.5 mol/L NH_(4)Ac as the electrolyte,layeredδ-MnO_(2) as the cathode material,and PTCDI as the organic anode material,and it can work stably in the voltage range of 0-1.5 V.The layeredδ-MnO_(2) cathode material was prepared through simple thermal decomposition of KMnO_(4) and was characterized by XRD,SEM,TEM,XPS,FTIR,and Raman spectroscopy.Through a proper combination of the PTCDI nanoparticle anode,the capacity retention rate of the full battery remained 92%of the initial capacity after 500 cycles at a current density of 0.5 A/g,and the coulombic efficiency was close to 100%,indicating excellent cycle stability.In addition,the energy storage mechanism of theδ-MnO_(2) nanosheet cathode and the ammonium-ion storage dynamics kinetics of the PTCDI organic anode were systematically studied.Ex situ XPS revealed that NH^(4+)can be reversibly intercalated/deintercalated in the cathode material.The full battery has a relatively high voltage window;thus,it can easily supply power to common electrical appliances,such as small fans and LEDs,and has a good development prospects.In summary,developing novel materials is of great significance to the construction of a new generation of safe and environmentally friendly aqueous ammonium-ion batteries.