J. Mater. Sci. Technol. ›› 2022, Vol. 97: 156-164.DOI: 10.1016/j.jmst.2021.04.045

• Research Article • Previous Articles     Next Articles

A novel Sn-based coordination polymer with high-efficiency and ultrafast lithium storage

Xinlu Zhanga, Lu Hana, Junfeng Lia, Ting Lua, Jinliang Lib,*(), Guang Zhuc, Likun Pana,*()   

  1. aShanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, P. R. China
    bSiyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China
    cKey Laboratory of SpinElectron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou 234000, China

Abstract:

Recently, Coordination Polymers (CPs) have been widely utilized as energy storage materials for reversible Lithium-Ion Batteries (LIBs) benefiting from their tunable building blocks and adjusted electrochemical properties. However, the unsatisfied electrochemical behavior of CPs with poor conductivity and sluggish ion transport kinetics is still a bottle-neck for their large-scale energy storage applications in LIBs. Herein, we display the rational fabrication of a conductive Sn-based coordination polymer (Sn-DHTPA) via judiciously choosing suitable building units. The Sn-DHTPA is employed as anode for LIBs, exhibiting superior reversible storage capacity of 1142.6 mA h g-1 at 0.1 A g-1 after 100 cycles and impressive rate storage capability of 287.7 mA h g-1 at 20 A g-1. More importantly, a robust cycling performance of 205.5 mA h g-1 at an extra-high current density of 20 A g-1 are observed without remarkable capacity-fading up to 1000 cycles. The behavior superiority of Sn-DHTPA is related to its advanced architecture with abundant lithium storage sites, high electrical conductivity and rapid lithium transport. A series of ex-situ characterizations reveal that the impressive lithium storage capacity is contributed by the redox active sites of both the aromatic linker and metal center related to in-situ generated metallic nanoparticles dispersed in the skeleton.

Key words: Sn-based coordination polymer, High electrical conductivity, Li-ion batteries, Anode, Lithium storage mechanism