使用纤维素纳米晶-MXene 和聚四亚甲基乙二醇水性聚氨酯及 PEO 制成的模量与温度无关的单离子导电聚合物电解质

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES Polymer Composites Pub Date : 2024-09-03 DOI:10.1002/pc.28980
Mohammad Nourany, Sasan Rostami, Farough Talebi
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引用次数: 0

摘要

随着电动汽车的快速发展,人们对高能量密度阳极的关注度大幅提高。金属锂(Li)的能量密度高达 3800 mAh/g。然而,液态电解质存在安全问题,因此必须使用更安全的替代品,如固态聚合物电解质(SPE)。在这方面,聚环氧乙烷(PEO)作为最主要的固态聚合物电解质,尽管面临着在 60°C 左右失去热机械稳定性和锂离子(Li+)转移数低()等挑战,但在聚合物中显示出最高的离子电导率(σ)。在此,我们设计了由聚醚砜、聚(四甘醇)基水性聚氨酯(WPU)、纤维素纳米晶(CNC)和 MXene 组成的 SPE。WPU 的存在对提高()非常有效。CNC 的高负载量()使弹性模量()与温度无关,终端(),同时改善了σ和()。这些成果归功于 CNC 与 PEO 的氧原子竞争并形成了强大的 CNC 网络。这种固相萃取剂具有很高的电化学稳定性。亮点 纤维素纳米晶体(CNC)增加了离子传导性,CNC 抑制了 PEO 球形颗粒的尺寸,并提高了热力学稳定性;MXene 破坏了 PEO 晶体生长,为传导提供了新途径。
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Single‐ion conducting polymer electrolytes with temperature‐independent modulus using cellulose nanocrystal‐MXene and Poly(tetramethylene glycol)‐based waterborne polyurethane and PEO
With the rapid progress of electric vehicles, the focus on high‐energy‐density anodes has increased substantially. Lithium metal (Li) possesses a high energy density of 3800 mAh/g. However, it poses safety issues for liquid electrolytes, mandating the use of safer replacements like solid polymer electrolytes (SPEs). In this regard, polyethylene oxide (PEO), as the most prominent SPE, shows the highest ionic conductivity (σ) among polymers despite facing challenges including loss of thermomechanical stability around 60°C and low lithium‐ion (Li+) transference number (). Here, we designed SPEs consisting of PEO, poly (tetramethylene glycol)‐based waterborne polyurethane (WPU), cellulose nanocrystal (CNC), and MXene. The presence of WPU was quite effective at increasing (). High CNC loading () made elastic modulus () independent of temperature with terminal , while improving σ and . These achievements were attributed to CNCs competing with over oxygen atoms of PEO and the formation of a strong CNC network. was able to increase σ from attributed to intercalation of PEO into its interlayer spaces while also increasing to 0.897. The SPEs showed a high electrochemical stability window. The optimal electrolyte showed high Coulombic efficiency and stable cycling performance.Highlights Ionomeric units resulted in a high lithium‐ion transference number () Hydrogen bonding was partially responsible for increased Cellulose nanocrystals (CNCs) increased ionic conductivity and CNCs suppressed PEO spherulites' size and increased thermomechanical stability MXene disrupts PEO crystal growth and provides a new route for conduction
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来源期刊
Polymer Composites
Polymer Composites 工程技术-材料科学:复合
CiteScore
7.50
自引率
32.70%
发文量
673
审稿时长
3.1 months
期刊介绍: Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research, production, processing, and applications. PC brings you the details of developments in this rapidly expanding area of technology long before they are commercial realities.
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