Tuning the electrochemical behaviors of N-doped LiMn_(x)Fe_(1–x)PO_(4)/C via cation engineering with metal-organic framework-templated strategy  

作　　者：Yilin Li Zhaohui Xu Xinyu Zhang Zhenyu Wu Jian-En Zhou Jinjiang Zhang Xiaoming Lin 

机构地区：[1]Guangzhou Key Laboratory of Materials for Energy Conversion and Storage,Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong,China [2]National Engineering Research Center for Carbohydrate Synthesis,Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang 330022,Jiangxi,China [3]Jiangmen Kanhoo Industry Co.,LTD,Jiangmen 529040,Guangdong,China

出　　处：《Journal of Energy Chemistry》2023年第10期239-253,I0008,共16页能源化学（英文版）

基　　金：the financial support from the Research and Development Plan Project in Key Fields of Guangdong Province(2020B0101030005);Applied Special Project of Guangdong Provincial Science and Technology Plan(2017B090917002);Basic and Applied Basic Research Fund of Guangdong Province(2019B1515120027);Key R&D projects in Guangdong Province(2020B0101030005)。

摘　　要：LiFePO_(4),as a prevailing cathode material for lithium-ion batteries(LIBs),still encounters issues such as intrinsic poor electronic conductivity,inferior Li-ion diffusion kinetic,and two-phase transformation mechanism involving substantial structural rearrangements,resulting in unsatisfactory rate performance.Carbon coating,cation doping,and morphological control have been widely employed to reconcile these issues.Inspired by these,we propose a synthetic route with metal–organic frameworks(MOFs)as self-sacrificial templates to simultaneously realize shape modulation,Mn doping,and N-doped carbon coating for enhanced electrochemical performances.The as-synthesized Li MnxFe1–xPO4/C(x=0,0.25,and0.5)deliver tunable electrochemical behaviors induced by the MOF templates,among which LiMn_(0.25)Fe_(0.75)PO_(4)/C outperforms its counterparts in cyclability(164.7 mA h g^(-1)after 200 cycles at 0.5 C)and rate capability(116.3 mA h g^(-1)at 10 C).Meanwhile,the ex-situ XRD reveals a dominant single-phase solid solution mechanism of LiMn_(0.25)Fe_(0.75)PO_(4)/C during delithiation,contrary to the pristine LiFePO_(4),without major structural reconstruction,which helps to explain the superior rate performance.Furthermore,the density functional theory(DFT)calculations verify the effects of Mn doping and embody the superiority of LiMn_(0.25)Fe_(0.75)PO_(4)/C as a LIB cathode,which well supports the experimental observations.This work provides insightful guidance for the design of tunable MOF-derived mixed transitionmetal systems for advanced LIBs.

关 键 词：LiMn_(x)Fe_(1–x)PO_(4)/C Mn doping Metal-organic framework Cathode 

分 类 号：TB34[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]