Fluorinated N,P co-doped biomass carbon with high-rate performance as cathode material for lithium/fluorinated carbon battery  

作　　者：Ke Yan Yan Zou Liang-Xue Bao Qi Xia Ling-Yi Meng Hai-Chen Lin Hui-Xin Chen Hong-Jun Yue 

机构地区：[1]College of Chemistry,Fuzhou University,Fuzhou,350108,China [2]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research On the Structure of Matter,Chinese Academy of Sciences,Fuzhou,350002,China [3]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen,361021,China [4]Sustainable Power and Energy Center,Nano Engineering Department,University of California San Diego,La Jolla,San Diego,CA,92093,USA

出　　处：《Rare Metals》2025年第1期110-120,共11页稀有金属(英文版)

基　　金：supported by Fujian Science and Technology Planning Projects of China(Nos.2022T3067 and 2023H0045);the Self-deployment Project Research Programs of Haixi Institutes,Chinese Academy of Sciences(No.CXZX-2022-JQ12);the Self-deployment project of XIREM(No.2023GG02).

摘　　要：Lithium/fluorinated carbon(Li/CF_(x))batteries are greatly limited in their applications mostly due to poor rate performances.In this study,N,P co-doped biomass carbon was synthesized using melamine and phytic acid as doping sources,and the resulting product was then utilized as a precursor for CF_(x).The resulting fluorinated biomass carbon has a high degree of fluorination,exceeding the specific capacity of commercial fluorinated graphite while also demonstrating exceptional performance at high discharge rates.During the fluorination process,N,P-containing functional groups were removed from the crystalline lattice in the basal plane.This facilitates the formation of a defect-rich carbon matrix,enhancing the F/C ratio by improving the fluorinated active sites and obtaining more highly active semi-ionic bonds.Additionally,the abundant defects and porous structure promote Li^(+)diffusion.Density functional theory calculations indicated that doping modification effectively reduces the energy barrier for Li+migration,enhancing Li+transport efficiency.The prepared CF_(x)delivers material with a maximum specific capacity of 919 mAh·g^(-1),while maintaining a specific capacity of 702 mAh·g^(-1)at a high discharge current density of 20C(with a capacity retention rate of 76.4%).In this study,fluorinated N,P co-doped biomass carbon,exhibiting ultrahigh capacity and high-rate performance,was prepared for the first time,which can potentially advance the commercialization of CF_(x).

关 键 词：Li/CF_(x)primary batteries Biomass carbon Heteroatom doping High performance 

分 类 号：TM9[电气工程—电力电子与电力传动]