摘要
Lithium-selenium batteries,as an advanced rechargeable battery system,have attracted wide attention.However,its application is hurdled by the ambiguous underlying mechanism such as the unclear active phase and the key role of the host materials.Herein,a three-dimensional(3D) functional matrix derived from the Co/Znmetal organic framework is synthesized to unravel the questions raised.It reveals that the strong interaction and voids in the 3D matrix serve to anchor the amorphous Se with high electrochemical properties.The obtained 3DC/Se exhibits 544.2 and 273.2 mAh·g^(-1) t current densities of 0.1C and 2.0C,respectively,with a diffusion-controlled mechanism.The excessive amount of Se beyond the loading capacity of the matrix leads to the formation of trigonal phase Se,which shows an unsatisfying electrochemical property.
基金
financially supported by the National Natural Science Foundation of China (Nos.51901189 and 51802265)
Shaanxi Provincial Key R&D Program (No.2021KWZ17)
China Postdoctoral Science Foundation Grant (No. 2020M683552)
the Natural Science Foundation of Chongqing (No.cstc2020jcyj-msxmX0859)。
