Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency  

作　　者：Jingke Ren Boyu Xing Wen Luo Binyang Luo Xinfei Wu Xin Yan Wencong Feng Feiyue Wang Chaojie Cheng Liqiang Mai 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [2]Department of Physics,School of Science,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Nano Research》2024年第6期5138-5147,共10页纳米研究（英文版）

基　　金：the financial support from the National Key Research and Development Program of China(Nos.2022YFB2404300 and 2023YFB3809303);the National Natural Science Foundation of China(Nos.51832004 and 52127816);State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(No.WUT:2022-KF-4).

摘　　要：Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically important.Herein,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon source.The high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full cells.This work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

关 键 词：graphite anode potassium-ion batteries high graphitization degree low-temperature pyrolysis initial Coulombic efficiency 

分 类 号：TB383[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]