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Figure 1.Schematic illustration for the fabrication ofthe 3Dsandwich-structured V2O5@graphene@V2O5cathode.

Ϊ½â¾öÉÏÊöÎÊÌ⣬ÖпÆÔº·ÂÉú¹¦ÄܲÄÁÏÓë´«¸ÐÆ÷¼þÑо¿ÖÐÐÄ¡¢ÒÁÀûŵÒÁ´óѧÏãéÄ·ÖУºÍ±öÖÝÖÝÁ¢´óѧµÄÑо¿ÈËÔ±ºÏ×÷Ìá³öÁËÒ»ÖÖÓÉ»îÐÔÎïÖÊÓëʯīϩ¹¹³ÉµÄ½é¿×ÈýÃ÷Öνṹ£¬¸Ã·½·¨Í¨¹ýӲģ°åµÄ·½Ê½»¯Ñ§ÆøÏà³Á»ý£¨CVD£©Éú³¤Ò»²ãʯīϩ£¬²¢Í¨¹ýÁ½´ÎÈܼÁÈÈÔÚʯīϩµÄÁ½²àԭλ¸´ºÏV2O5×÷Ϊ»îÐÔÎïÖÊ£¬´Ó¶øµÃµ½V2O5@graphene@V2O5ÈýÃ÷Öνé¿×ÍøÂç½á¹¹¡£

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Figure 2. a) SEM image of the electrodeposited Niinverse opal after PS opal template removal. b) SEM image of the graphene-coatedNi inverse opal. Inset in (b) is a high-magnification image. c) Cross-sectionalview SEM image of the graphene@V2O5after Ni scaffoldetching. d) Low- and e) high-magnification cross-sectional view SEM images ofthe V2O5@graphene@V2O5after thesecond V2O5solvothermal growth and subsequent heattreatment. Inset in (d) is illustration of the sandwich structure.The colorizedright half in (e) highlights the sandwich structure (first-growth V2O5(brown),second-growth V2O5after Ni etching (green), and theintermediate graphene layer (dark gap)). f) Raman spectrum of theV2O5@graphene@V2O5structure.

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Figure 3. a) Galvanostatic charge¨Cdischarge curves oftheV2O5@graphene@V2O5cathodes at 5C. b) Cycling capacity and Coulombic efficiency over 2000 cycles. Allcapacities are on a full electrode basis. c) Capacity and Coulombic efficiencyat varying C-rates. The electrode waspre-cycled 20 times at 1 C before startingthe measurements. d) CV curve of the V2O5@graphene@V2O5cathodeover the potential range of 2¨C4 V versus Li/Li+at a scan rate of 0.1 mV s¨C1.e) The 1st, 2nd, 10th,100th, and 1000th discharge¨Ccharge curves (at a rate of 5 C) of a 100 ¦Ìm thick V2O5@graphene@V2O5cathodefabricated using a commercial Ni scaffold as sacrificial template. The inset in(e) shows the cross-sectional SEM image of the thick V2O5@graphene@V2O5cathode.

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