Preparation of in-situ polymerized cross-linked porous polyimide composite materials research on electrochemical performance

doi:10.19936/j.cnki.2096-8000.20251128.005

Abstract

Abstract: In this paper, cross-linked porous polyimide composites with different MWCNTs contents were prepared by in-situ polymerization using multi-walled carbon nanotubes (MWCNTs) as additive (INCPI@MWCNTs). The group, pore structure and adsorption properties of the cross-linked porous polyimide composites (INCPI@MWCNTs) were studied. The feasibility of using the cross-linked porous polyimide composites as positive electrode materials for lithium-sulfur batteries was discussed. The results show that in-situ polymerization has no effect on the cross-linking reaction and the structure of porous polyimide. Under the condition of nitrogen isothermal adsorption test of different specifications INCPI@MWCNTs, the nitrogen adsorption capacity increased with the increase of relative pressure due to the presence of large pore structure in the material. The BET specific surface area and micropore specific surface area of INCPI@MWCNTs gradually decreased with the increase of the addition of MWCNTs. The volume of micropores increased with the addition of MWCNTs. Using INCPI@MWCNTs as the positive carrier, S/PPI@MWCNTs positive carrier composite material was obtained by diffusion loading with sulfur, and lithium-sulfur battery was assembled for electrochemical performance test. Under the condition of 0.2 C current density, two discharge platforms and one charging platform appear in the charge and discharge curves of three different S/INCPI@MWCNTs positive terminals. The specific initial discharge capacity of the battery corresponding to S/INCPI@MWCNTs-2 is 1 326 mAh·g^-1, and the retention capacity is 855 mAh·g^-1 after 100 cycles, capacity retention rate is 65%. Under the condition that the current density is 1 C, the specific capacity of the first discharge of S/INCPI@MWCNTs-2 battery is 1 035 mAh·g^-1, and after 400 cycles, the retention capacity is 662 mAh·g^-1, and the capacity retention rate is 65%. S/INCPI@MWCNTs-2 as the cathode material can make the battery have better discharge specific capacity, rate performance and cycle stability.

Key words: in-situ polymerization, porous polyimide, crosslinking, electrochemistry, lithium sulfur batteries, composites

CLC Number:

TB332

LUO Farong, ZHANG Zhiming, CHEN Jian. Preparation of in-situ polymerized cross-linked porous polyimide composite materials research on electrochemical performance[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(11): 40-47.

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