Rational construction of phosphate layer to optimize Cu-regulated Fe_(3)O_(4) as anode material with promoted energy storage performance for rechargeable Ni-Fe batteries  

作　　者：Shuhua Hao Yupeng Xing Peiyu Hou Gang Zhao Jinzhao Huang Shipeng Qiu Xijin Xu 

机构地区：[1]Laboratory of Functional Micro and Nano Materials and Devices,School of Physics and Technology,University of Jinan,Jinan 250024,China

出　　处：《Journal of Materials Science & Technology》2022年第13期133-141,共9页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51802177);Independent Cultivation Program of Innovation Team of Ji’nan City(Grant No.2019GXRC011)。

摘　　要：Flexible aqueous energy storage devices with high security and flexibility are crucial for the progress of wearable energy storage.Particularly,aqueous rechargeable Ni-Fe batteries owning a large theoretical capacity,low cost and outstanding safety characteristics have emerged as a promising candidate for flexible aqueous energy storage devices.Herein,Cu-doped Fe_(3)O_(4)(CFO)with 3D coral structure was prepared by doping Cu^(2+) based on Fe_(3)O_(4)nanosheets(FO).Furthermore,the Fe-based anode material(CFPO)grown on carbon fibers was obtained by reconstructing the surface of CFO to form a low-crystallization shell which can enhance the ion transport.Excitingly,the newly developed CFPO electrode as an innovative anode material further exhibited a high capacity of 117.5 mAh g^(-1)(or 423 F g^(-1))at 1 A g^(-1).Then,the assembled aqueous Ni-Fe batteries with a high cell-voltage output of 1.6 V deliver a high capacity of 49.02 mAh g^(-1) at 1 A g^(-1) and retention ratio of 96.8%for capacitance after 10000 continuous cycles.What’s more,the aqueous quasi-solid-state batteries present a remarkable maximal energy density of 45.6 Wh kg^(-1) and a power density of 12 kW kg^(-1).This work provides an innovative and feasible way and optimization idea for the design of high-performance Fe-based anodes,and may promote the development of a new generation of flexible aqueous Ni-Fe batteries.

关 键 词：Ni-Fe batteries High voltage window regulation High energy and power density Anode materials Amorphous phosphate layer 

分 类 号：TQ138.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TM91[电气工程—电力电子与电力传动]