一种用于抑制枝晶锂金属电池的具有优异锂传输性能的自发空间网络结构金属-有机框架复合聚合物电解质

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Ziying Liu, Kai Liu, Kaixiang Zhi, Jin Luo, Zhenyuan Hu, Yunfeng Zhang
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引用次数: 0

摘要

固态聚合物电解质(spe)由于其高能量密度和总体安全性而被广泛应用于所有固态锂金属电池(asslmb)中。然而,离子传输通道的稀缺性和锂离子迁移的低效限制了spe在实际应用中的发展。本文将金属有机框架(mof)结构纳米颗粒(MOF-NP)与peo基spe结合,得到复合聚合物电解质(cpe)。具体来说,MOF-NP是由MIL-101(Cr)共价连接的聚合物聚乙二醇二甘油酯(PEGDE)链通过氨基组成。MOF-NP中的氨基与PEO链形成氢键,降低了聚合物基体的结晶度。结合PEGDE链形成的自发空间网络,为Li+提供了一个额外的连续运输通道。因此,制备的CPEs (CPEs- mnp)具有较高的Li+输运能力。结果表明,CPEs-MNP具有4倍高的离子电导率(60 ℃时为1.2 × 10-3 S·cm−1)和0.66的Li+转移数。此外,Li| cpe - mnp |组装电池在0.1 mA·cm−2和60 °C下,初始极化电压为30.7 mV,可稳定循环1200 h。同时,LiFePO4| cpe - mnp |锂电池表现出优异的循环稳定性,在2C和60 °C下的放电容量达到133.2 mAh·g−1。本文认为,已开发的CPEs在高性能asslmb的实际应用中具有更大的生命力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A spontaneous spatial network structural metal-organic framework composite polymer electrolytes with excellent lithium transport performance for dendrite-suppressing lithium metal batteries
The solid-state polymer electrolytes (SPEs) for use in all solid-state lithium-metal batteries (ASSLMBs) are promising due to the high energy density and total safety. However, the scarcity of ion transport channels and the inefficient lithium-ion migration of SPEs have limited the growth of SPEs in practical applications. Herein, metal–organic frameworks (MOFs) structured nanoparticles (MOF-NP) were incorporated with PEO-based SPEs to obtain the composite polymer electrolytes (CPEs). Specifically, the MOF-NP are composed of MIL-101(Cr) covalently linked polymeric poly(ethylene glycol) diglycidyl ether (PEGDE) chains via the amino group. The amino groups in the MOF-NP formed the hydrogen bonds with PEO chains that reduce the crystallinity of the polymer matrix. In combination with the spontaneous spatial network created from the PEGDE chains, an additional continuous transport channel for Li+ was provided. Therefore, the prepared CPEs (CPEs-MNP) show a high Li+ transport capacity. It is confirmed that CPEs-MNP possesses 4 times higher ionic conductivity (1.2 × 10-3 S·cm−1 at 60 °C) and a much higher Li+ transfer number of 0.66. Furthermore, the assembled cell of Li|CPEs-MNP|Li cycling stable for 1200 h at 0.1 mA·cm−2 and 60 °C with a small initial polarization voltage of 30.7 mV. Meanwhile, the LiFePO4|CPEs-MNP|Li cell exhibits outstanding cycling stability and the discharge capacity reaches 133.2 mAh·g−1 at 2C and 60 °C. It is believed that the as-developed CPEs have a greater vitality in the practical application of high-performance ASSLMBs.
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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