【摘 要】
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Conversion-type reaction anode materials with high specific capacity are attractive candidates to improve lithium ion batteries(LIBs),yet the rapid capacity fading and poor rate capability caused by drastic vol-ume change and low electronic conductivity g
【机 构】
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Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005
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Conversion-type reaction anode materials with high specific capacity are attractive candidates to improve lithium ion batteries(LIBs),yet the rapid capacity fading and poor rate capability caused by drastic vol-ume change and low electronic conductivity greatly hinder their practical applications.To circumvent these issues,the successful design of yolk@shell Fe2O3@C hybrid composed of a columnar-like Fe2O3 core within a hollow cavity completely surrounded by a thin,self-supported carbon(C)shell is presented as an anode for high-performance LIBs.This yolk@shell structure allows each Fe2O3 core to swell upon lithia-tion without deforming the carbon shell.This preserves the structural and electrical integrity against pul-verization,as revealed by in situ transmission electron microscopy(TEM)measurement.Benefiting from these structural advantages,the resulting electrode exhibits a high reversible capacity(1013 mAhg-1 after 80 cycles at 0.2 A g-1),outstanding rate capability(710 mAh g-1 at 8 A g-1)and superior cycling stability(800 mAh g-1 after 300 cycles at 4 A g-1).A Li-ion full cell using prelithiated yolk@shell Fe2O3@C hy-brid as the anode and commercial LiCoO2(LCO)as the cathode demonstrates impressive cycling stability with a capacity retention of 84.5％after 100 cycles at 1 C rate,holding great promise for future practical applications.
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