In-situ construction of Li4Ti5O12/rutile TiO2 heterostructured nanorods for robust and high-power lithium storage  

作　　者：Yiguang Zhou Shuhao Xiao Jinxia Jiang Rui Wu Xiaobin Niu Jun Song Chen 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China [2]Chongqing Medical and Pharmaceutical College,Chongqing 401331,China [3]Institute for Advanced Study,Chengdu University,Chengdu 610106,China [4]Shenzhen Institute for Advanced Study,University of Electronic Science and Technology of China,Shenzhen 518110,China

出　　处：《Nano Research》2023年第1期1513-1521,共9页纳米研究（英文版）

基　　金：This work was financially supported by the National Key R&D Program of China(No.2021YFB2401900).

摘　　要：Li4Ti5O12 is considered as a safe and stable anode material for high-power lithium-ion batteries due to its“zero-strain”characteristic during the charge/discharge.However,the intrinsically low electronic conductivity leads to a deterioration in highrate performance,impeding its intensive application.Herein,the Li4Ti5O12/rutile TiO2(LTO/RT)heterostructured nanorods with tunable oxide phases have been in-situ fabricated by annealing the electrospun nanofiber precursor.By constructing such a heterostructured interface,the as-prepared sample delivers a high capacity of 160.3 mAh·g–1 at 1 C after 200 cycles,125.5 mAh·g–1 at 10 C after 500 cycles and a superior capacity retention of 90.3%after 1,000 cycles at 30 C,outperforming the heterostructure-free counterparts of pure LTO,RT and the commercial LTO product.Density Functional Theory calculation suggests a possible synergistic effect of the LTO/RT interface that would improve the electronic conductivity and Li-ion diffusion.

关 键 词：HETEROSTRUCTURE Li4Ti5O12/rutile TiO2 NANORODS density functional theory lithium storage 

分 类 号：TM912[电气工程—电力电子与电力传动]