A high Li-ion diffusion kinetics in multidimensional and compact-structured electrodes via vacuum filtration casting  

作　　者：Jieqiong Li Ting Ouyang Lu Liu Shu Jiang Yongchao Huang M.-Sadeeq Balogun 

机构地区：[1]College of Materials Science and Engineering,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan University,Changsha 410082,Hunan,China [2]Institute of Environmental Research at Greater Bay,Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Guangzhou University,Guangzhou 510006,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第6期368-376,I0010,共10页能源化学（英文版）

基　　金：supported by the Science and Technology Innovation Program of Hunan Province(2022WZ1012);the Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy(2020CB1007);the Natural Science Foundation of Guangzhou(202201020147)。

摘　　要：Manufacturing process,diffusion co-efficient and areal capacity are the three main criteria for regulating thick electrodes for lithium-ion batteries(LIBs).However,simultaneously regulating these criteria for LIBs is desirable but remains a significant challenge.In this work,niobium pentoxide(Nb_(2)O_(5))anode and lithium iron phosphate(LiFePO_(4))cathode materials were chosen as the model materials and demonstrate that these three parameters can be simultaneously modulated by incorporation of micro-carbon fibers(MCF)and carbon nanotubes(CNT)with both Nb_(2)O_(5) and LFP via vacuum filtration approach.Both as-prepared MNC-20 anode and MLC-20 cathode achieves high reversible areal capacity of≈5.4 m A h cm^(-2)@0.1 C and outstanding Li-ion diffusion coefficients of≈10~(-8)cm~2 s~(-1)in the half-cell configuration.The assembled MNC-20‖MLC-20 full cell LIB delivers maximum energy and power densities of244.04 W h kg^(-1)and 108.86 W kg^(-1),respectively.The excellent electrochemical properties of the asprepared thick electrodes can be attributed to the highly conductive,mechanical compactness and multidimensional mutual effects of the MCF,CNT and active materials that facilitates rapid Li-ion diffusion kinetics.Furthermore,electrochemical impedance spectroscopy(EIS),symmetric cells analysis,and insitu Raman techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture.

关 键 词：Thick electrodes Carbon nanotubes Li-ion diffusion co-efficient Vacuum filtration technique High areal capacity Lithium-ion batteries 

分 类 号：O646.54[理学—物理化学] TM912[理学—化学]