高性能Sb_(2)O_(4)@C/CC锂离子电池复合电极

High-performance Sb_(2)O_(4)@C/CC lithium-ion battery composite electrode

设计了以碳布(CC)为衬底,在其上生长金属有机框架的衍生物碳骨架(C),然后碳骨架内布局Sb_(2)O_(4)纳米棒,即Sb_(2)O_(4)@C/CC复合电极。Sb_(2)O_(4)@C/CC复合电极具有优异的电化学性能,在0.1 A/g的电流密度下,其初始比容量高达1616.1 mA·h/g,在100次循环后依然可逆,容量保持在1161.5 mA·h/g,接近Sb_(2)O_(4)的理论比容量(1227 mA·h/g),优于已报道的Sb_(2)O_(4)基复合材料。在1 A/g电流密度下,Sb_(2)O_(4)@C/CC电极的放电比容量高达837.2 mA·h/g,经过300次循环后,其容量仍保持在495.5 mA·h/g,接近初始容量的71.5%。在3 A/g的大电流密度下,Sb_(2)O_(4)@C/CC的可逆容量依然保持在311.3 mA·h/g。

Herein,we report on designing derivative carbon skeleton(C)of metal organic framework grown on carbon cloth(CC)substrate and Sb_(2)O_(4)nanorods inhabit C,Sb_(2)O_(4)@C/CC composite electrode.The Sb_(2)O_(4)@C/CC composite electrode exhibits excellent electrochemical performance,with an initial specific capacity of 1616.1 mA·h/g at a current density of 0.1 A/g.The reversible capacity can still be maintained at 1161.5 mA·h/g after 100 cycles,which is close to the theoretical specific capacity of Sb_(2)O_(4)(1227 mA·h/g)and superior to reported Sb_(2)O_(4)based composite material.At a current density of 1 A/g,the specific discharge capacity of Sb_(2)O_(4)@C/CC electrode is as high as 837.2 mA·h/g,and after 300 cycles,its capacity remains at 495.5 mA·h/g,which is close to 71.5%of the initial capacity.Even at a high current density of 3 A/g,the reversible capacity of the Sb_(2)O_(4)@C/CC electrode still remains at 311.3 mA·h/g.