Synthesis of α-Li FeO2/Graphene nanocomposite via layer by layer self-assembly strategy for lithium-ion batteries with excellent electrochemical performance
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第20期
论文作者：Youzuo Hu Hongyuan Zhao Ming Tan Jintao Liu Xiaohui Shu Meiling Zhang Shanshan Liu Qiwen Ran Hao Li Xingquan Liu
文章页码：173 - 181
摘 要：As a potential alternative cathode material,α-LiFeO2 suffers a realization handicap,mainly due to its poor electrical conductivity and low lithium ion diffusion rate.In this work,we have successfully synthesized α-LiFeO2/rGO nanocomposite through a layer by layer self-assembly modification process and annealing treatment.Due to the strong electrostatic attraction between opposite cha rged spices,α-LiFeO2 nanoparticles were homogeneously dispersed on the graphene sheet to form a typical interconnected conducting network which was bene ficial for electronic conductivity and ionic diffu sivity.In comparison to pristine α-LiFeO2,the α-LiFeO2/rGO displayed an excellent electrochemical perfo rmance with average discharge capacities of 238.9,187.2,178.4,121.8 and 99.5 mA hg-1 at 0.1,0.2,0.5,1 and 2 C,respectively.Besides,the specific capacity retained 164.9 mA h g-1 and 107.98 mA h g-1 after 50 cycles at 0.5 C and 1 C,respectively.The remarkable progress in rate capability and cycling ability of this new nanocomposite developed a new approach to improve the electrochemical performance of α-LiFeO2.
Youzuo Hu，Hongyuan Zhao，Ming Tan，Jintao Liu，Xiaohui Shu，Meiling Zhang，Shanshan Liu，Qiwen Ran，Hao Li，Xingquan Liu
R&D Center for New Energy Materials and Integrated Energy Devices, University of Electronic Science and Technology of China
摘 要：As a potential alternative cathode material,α-LiFeO2 suffers a realization handicap,mainly due to its poor electrical conductivity and low lithium ion diffusion rate.In this work,we have successfully synthesized α-LiFeO2/rGO nanocomposite through a layer by layer self-assembly modification process and annealing treatment.Due to the strong electrostatic attraction between opposite cha rged spices,α-LiFeO2 nanoparticles were homogeneously dispersed on the graphene sheet to form a typical interconnected conducting network which was bene ficial for electronic conductivity and ionic diffu sivity.In comparison to pristine α-LiFeO2,the α-LiFeO2/rGO displayed an excellent electrochemical perfo rmance with average discharge capacities of 238.9,187.2,178.4,121.8 and 99.5 mA hg-1 at 0.1,0.2,0.5,1 and 2 C,respectively.Besides,the specific capacity retained 164.9 mA h g-1 and 107.98 mA h g-1 after 50 cycles at 0.5 C and 1 C,respectively.The remarkable progress in rate capability and cycling ability of this new nanocomposite developed a new approach to improve the electrochemical performance of α-LiFeO2.
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