原位聚合交联多孔聚酰亚胺复合材料的制备及电化学性能研究

doi:10.19936/j.cnki.2096-8000.20251128.005

复合材料科学与工程 ›› 2025, Vol. 0 ›› Issue (11): 40-47.DOI: 10.19936/j.cnki.2096-8000.20251128.005

原位聚合交联多孔聚酰亚胺复合材料的制备及电化学性能研究

罗法荣¹, 张志明², 陈健³

1.广西机电职业技术学院,广西 530000;
2.中南大学化学化工学院,湖南 410083;
3.广州鹏辉能源科技股份有限公司,广东 510000

收稿日期:2024-08-08 出版日期:2025-11-28 发布日期:2025-12-24
通讯作者: 张志明(1993—),男,硕士研究生,讲师,研究方向为化学工程与电化学,ckdfkc@163.com。
作者简介:罗法荣(1983—),男,学士,讲师,研究方向为新能源汽车技术与新能源电池技术。
基金资助:
湖南省自然科学基金项目(2022JJ40630)

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

LUO Farong¹, ZHANG Zhiming², CHEN Jian³

1. Guangxi Mechanical and Electrical Vocational Technical College, Guangxi 530000, China;
2. School of Chemistry and Chemical Engineering, Central South University, Hunan 410083, China;
3. Guangzhou Great Power Energy & Technology Co., Ltd., Guangdong 510000, China

Received:2024-08-08 Online:2025-11-28 Published:2025-12-24

摘要/Abstract

摘要： 本文以多壁碳纳米管(MWCNTs)为添加剂,采用原位聚合方法制备了不同MWCNTs含量的交联多孔聚酰亚胺复合材料(INCPI@MWCNTs),对其基团、孔结构以及吸附性能进行了研究,重点探讨了其作为锂硫电池正极材料使用的可行性。结果表明:原位聚合工艺不会影响体系内的交联反应,对多孔聚酰亚胺的结构无较大影响;不同规格的INCPI@MWCNTs在氮气等温吸附测试条件下,由于材料内部大孔结构的存在而导致氮气吸附量随着相对压力的增加而增大,INCPI@MWCNTs材料的BET比表面积和微孔比表面积随着MWCNTs添加量的增加而逐渐减小,微孔体积随着MWCNTs添加量的增加而增大。以INCPI@MWCNTs为正极载体,与硫扩散负载得到S/PPI@MWCNTs正极载体复合材料,并组装锂硫电池进行电化学性能测试。在0.2 C的电流密度条件下,三种不同的S/INCPI@MWCNTs正极的充放电曲线均出现两个放电平台和一个充电平台,S/INCPI@MWCNTs-2对应的电池首次放电比容量为1 326 mAh·g^-1,循环100次后,保留容量为855 mAh·g^-1,容量保持率为65%;在电流密度为1 C时,S/INCPI@MWCNTs-2电池的首次放电比容量为1 035 mAh·g^-1,循环400次后,保留容量为662 mAh·g^-1,容量保持率为65%,S/INCPI@MWCNTs-2作为正极材料可使电池具有更佳的放电比容量、倍率性能和循环稳定性。

关键词: 原位聚合, 多孔聚酰亚胺, 交联, 电化学, 锂硫电池, 复合材料

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

中图分类号:

TB332

罗法荣, 张志明, 陈健. 原位聚合交联多孔聚酰亚胺复合材料的制备及电化学性能研究[J]. 复合材料科学与工程, 2025, 0(11): 40-47.

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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原位聚合交联多孔聚酰亚胺复合材料的制备及电化学性能研究

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

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