摘要
The zero-strain spinel Li_(4)Ti_(5)O_(12)stands out as a promising anode material for lithium-ion batteries due to its outstanding cycling stability.However,the limited theoretic specific capacity,low Li^(+) diffusion coefficient and electronic conductivity severely hinder its practical application.In this study,we demonstrate a strategy of introducing abundant oxygen vacancies not only on the surface and but also inside the bulk of Li_(4)Ti_(5)O_(12)particles via reductive thermal sintering.The oxygen vacancies can significantly enhance the electronic conductivity and lithium-ion diffusion coefficient of Li_(4)Ti_(5)O_(12),leading to a remarkable improvement in rate performance and a reduction in polarization.Moreover,additional lithium-ion accommodation sites can be created at the defective surface,contributing to a high specific capacity of over 200 mAh g^(-1).
基金
supported by the National Natural Science Foundation of China(No.52102200)
the Major Science and Technology Infrastructure Project of Material Genome Big-science Facilities Platform supported by Municipal Development and Reform Commission of Shenzhen,Basic and Applied Basic Research Foundation of Guangdong Province(No.2021B1515130002)
International Joint Research Center for Electric Vehicle Power Battery and Materials(No.2015B01015)
Guangdong Key Laboratory of Design and Calculation of New Energy Materials(No.2017B030301013).
