Free-standing hybrid films comprising of ultra-dispersed titania nanocrystals and hierarchical conductive network for excellent high rate performance of lithium storage  

作　　者：Kunlei Zhu Chenyu Li Yushuang Jiao Jiawen Zhu Hongtao Ren Yufeng Luo Shoushan Fan Kai Liu 

机构地区：[1]College of Chemistry and Chemical Engineering,Qufu Normal University,Jingxuan West Road NO.57,Qufu 273165,China [2]State Key Laboratory of New Ceramics and Fine Processing,and Key Laboratory of Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]School of Materials Science and Engineering,Liaocheng University,Hunan Road No.1,Liaocheng 252000,China [4]Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2021年第7期2301-2308,共8页纳米研究（英文版）

基　　金：The authors acknowledge the financial support from the National Key R&D Program of China(No.2018YFA0208401);Basic Science Center Project of NSFC under grant No.51788104;Scientific Research Foundation of Qufu Normal University(No.613701);Fund of Key Laboratory of Advanced Materials of Ministry of Education(No.2020AML04).

摘　　要：The construction of advanced electrode materials is key to the field of energy storage.Herein,a free-standing anatase titania(TiO_(2))nanocrystal/carbon nanotube(CNT)film is reported using a simple and scalable sol-gel method,followed by calcination.This unique free-standing film comprises ultra-small TiO_(2) nanocrystals(~5.9 nm)and super-aligned CNTs,with ultra-dispersed TiO_(2) nanocrystals on the surfaces of the CNTs.On the one hand,these TiO_(2) nanocrystals can significantly decrease the diffusion distance of the charges and on the other hand,the cross-linked CNTs can act as a three-dimensional(3D)conductive network,allowing the fast transport of electrons.In addition,the film is free-standing,without requiring electrode fabrication and additional conductive agents and binders.Owing to these above synergistic effects,the film is directly used as an anode in Li-ion batteries,and delivers a high discharge capacity of~105 mAh·g^(−1) at high rate of 60 C(1 C=170 mA·g^(−1))and excellent cycling performance over 2,500 cycles at 30 C.These results indicate that the free-standing anatase TiO_(2) nanocrystal/CNT film affords a superior performance among the various TiO_(2) materials and can be a promising anode material for fast-charging Li-ion batteries.Moreover,the TiO_(2)/CNT film exhibits an areal capacity of up to 2.4 mAh·cm^(−2),confirming the possibility of its practical use.

关 键 词：carbon nanotubes FREE-STANDING high rate Li-ion batteries TiO_(2) ultra-small 

分 类 号：TB33[一般工业技术—材料科学与工程]