Micro-structured lepidocrocite-type H_(1.07)Ti_(1.73)O_(4)as anode for lithium-ion batteries with an ultrahigh rate and long-term cycling performance  

作　　者：Li-Juan Hou Rui-Chao Liu Hui-Yu Yuan De-Zhi Kong Wei-Xia Shen Jin-Hao Zang Juan Guo Shu-Ge Dai Ming-Lang Wang Ting-Ting Xu Xin-Jian Li Ye Wang 

机构地区：[1]Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450052,China [3]Key Laboratory of Henan Province for High Temperature Functional Materials,Zhengzhou 450000,China [4]Shandong Key Laboratory of Medical Physics and Image Processing&Shandong Provincial Engineering and Technical Center of Light Manipulations,School of Physics and Electronics,Shandong Normal University,Jinan 250358,China

出　　处：《Rare Metals》2021年第6期1391-1401,共11页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U1804132,51802288 and 11504331);Academic Improvement Program of Physics of Zhengzhou University(No.2018WLTJ02);Zhengzhou University Youth Talent Start-up Grant,Zhongyuan Youth Talent Support Program of Henan Province(No.ZYQR201912152)。

摘　　要：The lepidocrocite-type H_(1.07)Ti_(1.73)O_(4) microsized structures with a tap density of 0.88 g·cm^(-3) were prepared through the ion exchange method with K_(0.8)Li_(0.27)Ti_(1.73)O_(4) powder as the precursor,and they exhibited good rate performance and outstanding cycle stability as an anode material for lithium ion batteries(LIB).The ion exchange method provides favorable conditions for H_(1.07)Ti_(1.73)O_(4) as an anode electrode material for LIBs.X-ray photoelectron spectroscopy(XPS)result demonstrates the existence of defects in the nonstoichiometric H1.07Ti1.73O4,which have a beneficial effect on the LIB performance.The electrochemical performance test proves that the half-cell with microsized H_(1.07)Ti_(1.73)O_(4)as the anode electrode can maintain a specific capacity of 129.5 mAh·g^(-1) after 1100 cycles and 101 mAh·g^(-1)after 3000 long cycles at high current densities of 2.0 and 5.0 A·g^(-1),respectively.In addition,the small volume change rate of 3.6%in H_(1.07)Ti_(1.73)O_(4)during Li ion insertion was confirmed by real-time in situ transmission electron microscopy(TEM).The LiFePO_(4)||H_(1.07)Ti_(1.73)O_(4)full battery exhibits a longterm cycling stability with a specific capacity of73.8 mAh·g^(-1) at a current density of 500 mA·g^(-1) after 200 cycles.

关 键 词：Lepidocrocite-type H_(1.07)Ti_(1.73)O_(4) Anode material of lithium ion batteries Long cycle stability 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]