Homovalent doping:An efficient strategy of the enhanced TiNb2O7 anode for lithium-ion batteries

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：The low energy density,unsatisfied cycling performance,potential safety issue and slow charging kinetics of the commercial lithium-ion batteries restrained their further application in the fields of fast charging and long-haul electric vehicles.Monoclinic TiNb2O7(TNO)with the theoretical capacity of 387 mAh g-1 has been proposed as a high-capacity anode materials to replace Li4Ti5O12.In this work,homovalent doping strategy was used to enhance the electrochemical performance of TiNb2O7(TNO)by employing Zr to partial substitute Ti through solvothermal method.The doping of Zr4+ions can enlarge the lattice structure without changing the chemical valence of the original elements,refine and homogenize the grains,improve the electrical conductivity,and accelerate the ion diffusion kinetics,and finally enhance the cycle and rate performance.Specifically,Z0.05-TNO shows initial discharge capacity of as high as 312.2 mAh g-1 at 1 C and 244.8 mAh g-1 at 10 C,and still maintains a high specific capacity of 171.3 mAh g-1 after 800 cycles at 10 C.This study provides a new strategy for high-performance fast-charging energy storage electrodes.

外文关键词：

Homovalent dopingZr4+TiNb2O7MicrosphereLithium-ion batteries

作者：

Xiaohe Jin、Yirui Deng、Han Tian、Miaomiao Zhou、Wenhao Tang、Huiyou Dong、Xinquan Zhang、Ruiping Liu

展开 >

作者单位：

Department of Materials Science and Engineering,China University of Mining&Technology(Beijing),Beijing,100083,China

基金：

国家自然科学基金北京市科技新星计划中央高校基本科研业务费专项Key Research and Development and transformation projects in Qinghai ProvinceHebei Province

项目编号：

52272258202204842142021JCCXJD012021-HZ-80821314401D

出版年：

2024

DOI：

10.1016/j.gee.2023.01.007

绿色能源与环境(英文)

CSTPCD

ISSN：

年,卷(期)：2024.9(8)