Enhanced electrochemical performance of Li–Co-BTC ternary metal–organic frameworks as cathode materials for lithium-ion batteries. Issue 6 (22nd January 2019)

• Record Type: Journal Article
• Authors: Du, Zhen-Qiang; Li, Yong-Peng; Wang, Xing-Xia; Wang, Juan; Zhai, Quan-Guo
• Is Part Of: Dalton transactions. Volume 48:Issue 6(2019)
• Page Start: 2013
• Page End: 2018
• Publication Date: 2019-01-22
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04863k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A design of ternary Li–Co-benzenetricarboxylate metal–organic frameworks exhibiting top-level electrochemical performance as cathode materials for lithium-ion batteries is presented. Abstract : Metal–organic frameworks (MOFs) with diverse structures have been projected as futuristic electrode materials for lithium-ion batteries (LIBs). In this work, two ternary Li–Co-MOFs of three-dimensional (3D) porous structures were synthesized, inspired by LiCoO2 inorganic metal salts, through a simple solvothermal method and further applied as active cathode materials for the first time in lithium-ion batteries. In these MOF structures, the lithium atoms are located at the same (SNNU-73) or different (SNNU-76) sites as cobalt atoms, and the four-coordinated tetrahedron mode is used to coordinate with the oxygen atoms. The 3D porous frameworks provide a good channel for the embedding and de-embedding of lithium ions. The experimental results suggest that porous Li–Co-MOF ternary composites show excellent cycling stability. Particularly, the discharge capacity and average coulombic efficiency of SNNU-73 reach 155.6 mA h g −1 and nearly 100% for 50 cycles at a rate of 50 mA g −1 . This synergistic effect of mixed Li and Co sites demonstrates great potential of MOFs as advanced electrode materials, and provides a promising route to designing porous materials for lithium-ion batteries in the future.