物理化学学报 >> 2025, Vol. 41 >> Issue (7): 100082.doi: 10.1016/j.actphy.2025.100082

论文 上一篇    

PEG-VN改性PP隔膜用于高稳定性高效率锂硫电池

石英彤1,†, 徐国桐2,†, 梁贵增1, 兰笛3, 张思远4, 王彦儒1,*(), 李道浩1,*(), 吴广磊1,*()   

  1. 1 青岛大学材料科学与工程学院, 生物纤维与生态纺织国家重点实验室, 山东 青岛 266071
    2 青岛滨海学院新型金属功能材料青岛工程研究中心, 山东省高校先进金属功能材料及其加工特色实验室, 山东 青岛 266555
    3 湖北汽车工业学院汽车材料学院, 湖北 十堰 442002
    4 西北工业大学化学与化工学院, 陕西 西安 710072
  • 收稿日期:2025-01-17 修回日期:2025-03-14 录用日期:2025-03-18 发布日期:2025-05-22
  • 通讯作者: Email: yrwang1996@163.com (王彦儒)lidaohao@qdu.edu.cn (李道浩)wuguanglei@mail.xjtu.edu.cn (吴广磊)
  • 作者简介:

    †These authors contributed equally to this work.

  • 基金资助:
    国家自然科学基金(52302272); 国家自然科学基金(52377026); 山东省泰山学者青年专家计划(tsqn202211124); 山东省泰山学者青年专家计划(tsqn202103057); 山东省自然科学基金(ZR2022QB023); 山东省自然科学基金(ZR2024ME046); 山东省高等学校青创人才引育计划“海洋多糖纤维基能源材料研究创新团队”及青岛大学生物纤维与生态纺织品国家重点实验室(ZKT10); 山东省高等学校青创人才引育计划“海洋多糖纤维基能源材料研究创新团队”及青岛大学生物纤维与生态纺织品国家重点实验室(GZRC202006)

PEG-VN modified PP separator for high-stability and high-efficiency lithium-sulfur batteries

Yingtong Shi1, Guotong Xu2, Guizeng Liang1, Di Lan3, Siyuan Zhang4, Yanru Wang1,*(), Daohao Li1,*(), Guanglei Wu1,*()   

  1. 1 State Key Laboratory of Bio-fibers and Eco-textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, Shandong Province, China
    2 Qingdao Engineering Research Center for New Metallic Functional Materials, Characteristic Laboratory of Advanced Metal Functional Materials and Processing in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, Shandong Province, China
    3 School of Automotive Materials, Hubei University of Automotive Technology, Shiyan 442002, Hubei Province, China
    4 School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi Province, China
  • Received:2025-01-17 Revised:2025-03-14 Accepted:2025-03-18 Published:2025-05-22
  • Contact: Email: yrwang1996@163.com (Yanru Wang)lidaohao@qdu.edu.cn (Daohao Li)wuguanglei@mail.xjtu.edu.cn (Guanglei Wu)
  • Supported by:
    the National Natural Science Foundation of China(52302272); the National Natural Science Foundation of China(52377026); Taishan Scholars and Young Experts Program of Shandong Province(tsqn202211124); Taishan Scholars and Young Experts Program of Shandong Province(tsqn202103057); the Natural Science Foundation of Shandong Province(ZR2022QB023); the Natural Science Foundation of Shandong Province(ZR2024ME046); the Qingchuang Talents Induction Program of Shandong Higher Education Institution (Research and Innovation Team of Marine Polysaccharides Fibers-based Energy Materials), the State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University(ZKT10); Qingchuang Talents Induction Program of Shandong Higher Education Institution (Research and Innovation Team of Marine Polysaccharides Fibers-based Energy Materials), the State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University(GZRC202006)

摘要:

锂硫(Li-S)电池因其高理论能量密度被视为下一代能源存储系统中最有前景的候选者之一。然而,Li-S电池的实际应用受到锂离子(Li+)传输效率低和由于穿梭效应引起的快速容量衰减的限制。在此,我们报道了一种复合材料,由聚乙二醇(PEG)和氮化钒(VN)纳米片涂覆在商业聚丙烯(PP)隔膜上,称为PEG-VN@PP隔膜。VN纳米片所表现出的超催化效应和吸附特性显著增强了多硫化物的转化,从而提高了Li-S电池的容量和稳定性。由于PEG的涂层,Li+被极性官能团吸引,实现了选择性传输,改善了Li+的传输效率和Li-S电池的倍率性能。使用硫质量负载为1.2 mg·cm−2的碳纳米管/硫阴极组装的Li-S电池,展现出高达782.0 mAh·g−1的比容量,并在1C (1675 mA·g−1)条件下经过700个循环后平均容量衰减为0.048%。

关键词: 氮化钒, 聚乙二醇, 隔膜修饰, 穿梭效应, 锂硫电池

Abstract:

Lithium-sulfur (Li-S) batteries are regarded as one of the most promising candidates for next generation energy storage systems due to their high theoretical energy density. However, the practical application of Li-S batteries is limited by the low lithium ion (Li+) transport efficiency and the rapid capacity decay caused by the shuttle effect. Herein, we report a composite comprising Polyethylene glycol (PEG) and vanadium nitride (VN) nanosheets coated onto a commercial polypropylene (PP) separator, called PEG-VN@PP separator. The supercatalytic effect and adsorption properties exhibited by the VN nanosheets significantly enhance the conversion of polysulfides, thereby improving both the capacity and stability of Li-S batteries. Due to the coating of PEG, lithium ions are attracted to the polar functional groups, enabling selective transport, which improves the transport efficiency of Li+ and the rate capability of Li-S batteries. The Li-S battery assembled with PEG-VN@PP exhibits a high specific capacity of 782.0 mAh·g−1 and an average capacity decay of 0.048% per cycle at 1C (1675 mA·g−1) for 700 cycles, using the carbon nanotubes/sulfur cathode with a sulfur mass loading of 1.2 mg·cm−2.

Key words: Vanadium nitride, Polyethylene glycol, Separator modification, Shuttle effect, Lithium-sulfur batteries