Micro-structured lepidocrocite-type H1.07Ti1.73O4 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
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: MICRO/NANOSTRUCTURED ELECTRODE MATERIALS FOR ELECTROCATALYSIS AND BATTERY
• 页码范围: 1391-1401
• 页数: 11页
• 语种: 英文

摘要

The lepidocrocite-type H 1.07Ti1.73O4 microsized structures with a tap density of 0.88 g·cm-3 were prepared through the ion exchange method with K0.8Li0.27Ti1.73O4 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 1.07Ti1.73O4 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 electro-chemical performance test proves that the half-cell with microsized H1.07Ti1.73O4 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 H1.07Ti1.73O4 during Li ion insertion was confirmed by real-time in situ transmission electron microscopy (TEM).The LiFePO4ⅡH1.07Ti1.73O4 full battery exhibits a long-term cycling stability with a specific capacity of 73.8 mAh·g-1 at a current density of 500 mA·g-1 after 200 cycles.