The template-free synthesis of hierarchically porous anatase TiO2 via acid-etching for enhancing the cycling stability and reversible capacity of lithium ion batteries
Although anatase TiO2 has good performances in many applications,it is very difficult to synthesize nanocrystalline anatase TiO2 with high specific surface areas.Herein,a two-dimensional hierarchically porous anatase TiO2 with specific surface areas of 486 m2 g-1 is fabricated through acetic acid etch and facilitate the crystal phase transition of amorphous TiO2.The ranges of pore size are 2～6 and 15～80 nm,the pore diameter centers are 3.5 and 45 nm,respectively.As the anode materials for lithium ion battery,the initial discharge capacity of hierarchically porous anatase TiO2 reaches to 449 mAh g-1 at a current rate of 0.1 A g-1 and retain 191 mAh g-1 after 60 cycles,especially the discharge capacity of 42 and 35 mA h g-1 can be resumed after 750 cycles at the current rate of 1 and 5 A g-1,exhibiting a high electrochemical stability and a high reversible capacity.The further research reveals that the fabrication of hierarchically porous anatase TiO2 depends on the adding amount of HAc and pH value in solution.
Xiaobing Wang Zhichao Jia Fuyuan Liu Huijun Liang Xinxin You Kui Wang Xiangdong Lou Wei Shuang Lichun Xiao Bibo Cai Lin Yang
国内会议
上海
英文
1-18
2016-11-04（万方平台首次上网日期，不代表论文的发表时间）