钒酸锌/多孔石墨烯的制备及储锂性能研究

Synthesis and Lithium Storage Properties of Zn_(3)V_(3)O_(8)/Porous Graphene

利用一种简易的模板法制成多孔石墨烯框架(pG),将石榴状的钒酸锌(Zn_(3)V_(3)O_(8))纳米球包覆在多孔石墨烯纳米片里,形成独特结构的钒酸锌/多孔石墨烯(Zn_(3)V_(3)O_(8)/p G)纳米复合材料.作为一种锂离子电池负极材料,Zn_(3)V_(3)O_(8)/p G表现出良好的储锂性能,在1000 mA g^(-1)的电流密度下经过200次循环后达到586 mAh g^(-1)的可逆容量.Zn_(3)V_(3)O_(8)/p G良好的电化学性能主要归因于其独特的多孔网状碳结构为钒酸锌纳米球在充放电循环过程中的体积变化提供缓冲空间,以及石榴状的钒酸锌纳米球与多孔石墨烯之间形成的良好协同效应.

A simple template method was used to fabricate porous graphene framework(pG),and a pomegranate-like zinc vanadate(Zn3V3O8)nanospheres were coated in the porous graphene nanosheets to form the unique structure of zinc vanadate/porous graphene(Zn_(3)V_(3)O_(8)/pG)nanocomposites.As an anode material for lithium ion batteries(LIBs),the Zn_(3)V_(3)O_(8)//pG show good lithium storage performance and deliver a reversible capacity of 586 mAh g^(_1) at 1000 mA g^(_1) after 200 cycles.The superior electrochemical performance of Zn_(3)V_(3)O_(8)//pG nanocomposites can be attributed to the unique porous network carbon structure,which provides buffer space for the volume change of Zn3V3O8 nanospheres during charge and discharge cycles,and the synergistic effects between pomegranate-like Zn3V3O8 nanospheres and porous graphene network.