Improvement on electrochemical performances of nanoporous titania as anode of lithium-ion batteries through annealing of pure titanium foils

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（1）
• 页码范围: 250-263
• 页数: 14页
• 语种: 英文

摘要

The effect of annealing of Ti foils before anodization on the morphology and electrochemical performance of resultant nanoporous anatase TiO2 (np-TiO2) as anode in rechargeable lithium-ion batteries (LIBs) was investigated.The np-TiO2 anode fabricated from annealed Ti foils exhibited higher specific surface area and reduced pore diameter compared to np-TiO2 electrode fabricated from as-received Ti foils.The highly porous np-TiO2 anode fabricated from annealed Ti foils exhibited 1st discharge capacity of 453.25 mAh/g and reduced to 172.70 mAh/g at 1 C current rate after 300cycles;whilst the np-TiO2 electrode fabricated from the as-received Ti foils exhibited 1st discharge capacity of 213.30 mAh/g and reduced to 160.0 mAh/g at 1 C current rate after 300 cycles.Even after 400 cycles,such np-TiO2 electrode exhibited a reversible capacity of 125.0 mAh/g at 2.5 C current rate.Compared to the untreated Ti foils,the enhanced electrochemical performance of np-TiO2 anode fabricated from annealed Ti foils was ascribed to the annealinginduced removal of residual stress among the Ti atoms.The benefit of annealing process can reduce pore size of as-fabricated np-TiO2.