Oxygen vacancy boosted the electrochemistry performance of Ti4+ doped Nb2O5 toward lithium ion battery

被引：48

作者：

Zhai, Ximei ^{[1
]}

Liu, Jialin ^{[1
]}

Zhao, Yongjie ^{[1
]}

Chen, Chao ^{[2
]}

Zhao, Xiuchen ^{[1
]}

Li, Jingbo ^{[1
]}

Jin, Haibo ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Construct Tailorable Adv Funct Ma, Beijing 100081, Peoples R China

[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2020年 / 499卷

基金：

中国国家自然科学基金;

关键词：

T-Nb2O5; Oxygen vacancies; Intercalation; Lithium ion batteries; IMPROVED SOLAR ABSORPTION; HIGH-POWER ANODES; ENERGY-STORAGE; NANOSTRUCTURED NB2O5; ORTHORHOMBIC NB2O5; CARBON; GRAPHENE; MICROSPHERES; NANOFIBERS; CHALLENGES;

D O I：

10.1016/j.apsusc.2019.143905

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, oxygen-deficient orthorhombic niobium oxide (T-Nb2O5) has been synthesized via a facile solid-state reaction method. The strategies of Ti4+ doping and being annealed in the reducing atmosphere can introduce oxygen vacancies to Nb2O5 (denoted as NTAH). When being tested as lithium ion batteries' anode, the obtained NTAH electrode shows obvious improved electrochemical performances with high specific capacity and superior cycling stability. Specifically speaking, a high reversible capacity of above 178 mA h g(-1) has been retained after 500 cycles at the current density of 200 mA g(-1). In addition, NTAH electrode can maintain a specific capacity of 63 mA h g(-1) after 500 cycles at the current density of 2A g(-1). EIS and CV measurement reveal that the intentionally introduced oxygen vacancies into T-Nb2O5 can improve the conductivity of electrodes and increase the active sites for redox reaction. At the same time, the merit of intercalation reversible mechanism can ease the volume variation of T-Nb2O5 during cycling process and consequently an enhanced electrochemical performance can be expected.

引用

页数：7