关键词: 共轭羰基, 金属有机材料, 负极, 锂离子电池

Abstract: Conjugated carbonyl compounds have become the one of the most widely studied class of organic electrode materials due to its good ion and electron transport properties and high reversibility. The sodium salt of 3, 4, 9, 10-perylenetetracarboxylic acid (Na₄C₂₄H₈O₈, Na-PTCA) was synthesized by the reaction between 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) precursor with NaOH solution. Na-PTCA exhibits a stable cycling performance, which discharge specific capacity remains 468 mA·h·g^-1 after 100 cycles at a current density of 50 mA·g^-1 in the voltage range of 0.01~2 V vs. Li⁺/Li. Meanwhile, the redox sites of carboxylate groups (C=O) showing discharge/charge plateaus at about 1.10/1.38 V deliver a high cyclic reversibility and reveal a reversible capacity of 148 mA·h·g^-1 after 100 cycles. These results provide a design strategy for expanding the families of anode electrode materials for lithium ion batteries.

Key words: conjugated carbonyl groups, metal-organic materials, anode, lithium ion batteries