摘要
采用固相法制备钛酸锂(Li_(4)Ti_(5)O_(12))/乙炔黑(AB)/多壁碳纳米管(MWCNT)复合材料,并通过高能球磨对复合材料进行改性。随着球磨转速的增加,复合材料所产生的剪切力和垂直力不断增强,使AB、MWCNT与Li_(4)Ti_(5)O_(12)的接触更充分,为Li+和电子传输提供更多的位点,提高了Li_(4)Ti_(5)O_(12)粒子界面电子传输能力;200~400 nm粒度的粉体粒子在Li_(4)Ti_(5)O_(12)中的含量由球磨前的32%增加到500 r/min球磨后的82%。以500 r/min球磨的复合材料,以10.0 C在1.0~2.5 V充放电,比容量从球磨前的112 mAh/g提升到130 mAh/g,经过500次循环,容量只损失0.9%。
Lithium titanate(Li_(4)Ti_(5)O_(12))/acetylene black(AB)/multiwall carbon nanotube(MWCNT)composite was prepared through solid-state method,the composite materials was modified by high-energy ball-milling.With the increase of the ball-milling rate,the sheer force and vertical force of composite materials were enhanced,the contact of AB,MWCNT and Li_(4)Ti_(5)O_(12) was more sufficient,more sites for Li+and electron transport were provided,the electron transport capacity of interface between Li_(4)Ti_(5)O_(12) particles was improved.The proportion of particles with size of 200~400 nm in Li_(4)Ti_(5)O_(12) powder increased from 32%(before ball-milling)to 82%(after ball-milling at 500 r/min).The specific capacity of the composite after ball-milling at 500 r/min was increased from 112 mAh/g to 130 mAh/g under 10.0 C at 1.0-2.5 V,the capacity loss was only 0.9%after 500 cycles.
作者
方巍
董恩杰
梅泽民
尹鸽平
FANG Wei;DONG En-jie;MEI Ze-min;YIN Ge-ping(School of Chemistry,Baicheng Normal University,Baicheng,Jilin 137000,China;School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150001,China)
出处
《电池》
CAS
北大核心
2021年第4期329-333,共5页
Battery Bimonthly
基金
国家自然科学基金项目(21773049)
吉林省教育厅项目(JJKH20190619KJ)。
