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

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外文摘要：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(Nb2O5)anode and lithium iron phosphate(LiFePO4)cathode materials were chosen as the model materials and demon-strate that these three parameters can be simultaneously modulated by incorporation of micro-carbon fibers(MCF)and carbon nanotubes(CNT)with both Nb2O5 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 cm2 s-1 in the half-cell configura-tion.The assembled MNC-20||MLC-20 full cell LIB delivers maximum energy and power densities of 244.04 W h kg-1 and 108.86 W kg-1,respectively.The excellent electrochemical properties of the as-prepared thick electrodes can be attributed to the highly conductive,mechanical compactness and mul-tidimensional mutual effects of the MCF,CNT and active materials that facilitates rapid Li-ion diffusion kinetics.Furthermore,electrochemical impedance spectroscopy(E1S),symmetric cells analysis,and in-situ Raman techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture.

外文关键词：

Thick electrodesCarbon nanotubesLi-ion diffusion co-efficientVacuum filtration techniqueHigh areal capacityLithium-ion batteries

作者：

Jieqiong Li、Ting Ouyang、Lu Liu、Shu Jiang、Yongchao Huang、M.-Sadeeq Balogun

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作者单位：

College of Materials Science and Engineering,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan University,Changsha 410082,Hunan,China

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

基金：

Science and Technology Innovation Program of Hunan ProvinceHunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyNatural Science Foundation of Guangzhou

项目编号：

2022WZ10122020CB1007202201020147

出版年：

2024

DOI：

10.1016/j.jechem.2024.01.052

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.93(6)

参考文献量66