Oxygen?Defect Enhanced Anion Adsorption Energy Toward Super?Rate and Durable Cathode for Ni–Zn Batteries

• 作者: Jia Yao Houzhao Wan Chi Chen Jie Ji Nengze Wang Zhaohan Zheng Jinxia Duan Xunying Wang Guokun Ma Li Tao Hanbin Wang Jun Zhang Hao Wang
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（11）
• 页码范围: 128-141
• 页数: 14页
• 语种: 英文

摘要

The alkaline zinc-based batteries with high energy density are becoming a research hotspot. However, the poor cycle stability and low-rate performance limit their wide application. Herein, ultra-thin -CoNiO2 nanosheet with rich oxygen defects anchored on the vertically arranged Ni nanotube arrays -(Od-CNO@Ni NTs) is used as a positive material for rechargeable alkaline Ni–Zn batteries. As the highly uniform Ni nanotube arrays provide a fast electron/ion transport path and abundant active sites, the -Od-CNO@Ni NTs electrode delivers excellent capacity (432.7 mAh -g?1) and rate capability (218.3 mAh -g?1 at 60 A -g?1). Moreover, our -Od-CNO@Ni NTs//Zn battery is capable of an ultra-long lifespan (93.0％ of initial capacity after 5000 cycles), extremely high energy density of 547.5 Wh -kg?1 and power density of 92.9 kW -kg?1 (based on the mass of cathode active substance). Meanwhile, the theoreti-cal calculations reveal that the oxygen defects can enhance the interaction between electrode surface and electrolyte ions, contributing to higher capacity. This work opens a reasonable idea for the development of ultra-durable, ultra-fast, and high-energy Ni–Zn battery.