Study on Synthesis and Storage Mechanism of Naphthalene Diamide-Based Organic Cathode Materials for Lithium-Ion Battery
Organic electrode materials have become increasingly important due to their high specific capacity,flexible structure and environmental friendliness.In this paper,a new type of multi-electron reaction organic electrode material NDI-N was synthesized by extending the pyrazine group at the nuclear site of naphthalimide(NDI),which exhibits good crystal structure and electrochemical stability.Electrochemical tests showed that the initial discharge specific capacity of NDI-N reached 155 mAh·g-1,and there was still a capacity retention rate of 97％after 500 cycles at a current density of 0.2 C.Through ex-situ 1H NMR tests and theoretical calculations,it was found that the reaction between NDI-N and lithium ions first occurs on the C=N double bond in pyrazine unit,followed by the C=O double bond in NDI structure.The elucidation of this mechanism provides a feasible solution for the study of core-expand NDI multi-electron organic electrode materials.
Lithium ion batteryNaphthalene diimideOrganic small moleculeCathode material
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