A biodegradable nano-composite membrane for high-safety and durable lithium-ion batteries

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Micro & Nano Letters Pub Date : 2023-05-22 DOI:10.1049/mna2.12168

Ting Wang, Na Liu, Hui Zhou, Ming-Jun Chen

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Abstract

As a key component of lithium-ion batteries (LIBs), separator plays a crucial role in the performance and safety of LIBs. In this paper, a cellulose-based porous membrane modified by nano CaCO₃ is prepared conveniently by electrospinning. The membrane exhibits rich fibrous porous networks and uniform distribution of nanoparticles. Strengthened by CaCO₃, the tensile strength of the cellulose porous membrane elevates from 4.7 ± 0.4 MPa to 7.7 ± 0.7 MPa. Besides, the modified membranes possess improved thermal stability and can maintain their original size after treatment at 150°C and 180°C. Also, the electrolyte uptake of cellulose/CaCO₃ membrane is 73% higher than that of the pure cellulose membrane. Thus, the ionic conductivity of membrane achieves 1.08 mS cm⁻¹ and the electrochemical window is about 4.8 V, which meets the practical requirements of LIBs. Significantly, with LiFePO₄/Li battery this membrane can run for 230 cycles with a capacity retention of 97.4% and a discharge capacity of 149.0 mAh g⁻¹, demonstrating the huge potential for high safety and next-generation LIBs.

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一种用于高安全性和耐用锂离子电池的可生物降解纳米复合膜

隔膜作为锂离子电池的关键部件，对锂离子电池性能和安全性起着至关重要的作用。本文采用静电纺丝法制备了纳米CaCO3改性纤维素基多孔膜。该膜具有丰富的纤维多孔网络和均匀分布的纳米颗粒。CaCO3增强后，纤维素多孔膜的拉伸强度从4.7±0.4MPa提高到7.7±0.7MPa。此外，改性膜具有更好的热稳定性，在150°C和180°C处理后可以保持其原始尺寸。此外，纤维素/CaCO3膜的电解质吸收比纯纤维素膜高73%。因此，膜的离子电导率达到1.08 mS cm−1，电化学窗口约为4.8 V，满足LIBs的实际要求。值得注意的是，使用LiFePO4/Li电池，这种膜可以运行230次循环，容量保持率为97.4%，放电容量为149.0 mAh g−1，显示出高安全性和下一代LIBs的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Micro & Nano Letters 工程技术-材料科学：综合

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

2.8 months

期刊介绍： Micro & Nano Letters offers express online publication of short research papers containing the latest advances in miniature and ultraminiature structures and systems. With an average of six weeks to decision, and publication online in advance of each issue, Micro & Nano Letters offers a rapid route for the international dissemination of high quality research findings from both the micro and nano communities. Scope Micro & Nano Letters offers express online publication of short research papers containing the latest advances in micro and nano-scale science, engineering and technology, with at least one dimension ranging from micrometers to nanometers. Micro & Nano Letters offers readers high-quality original research from both the micro and nano communities, and the materials and devices communities. Bridging this gap between materials science and micro and nano-scale devices, Micro & Nano Letters addresses issues in the disciplines of engineering, physical, chemical, and biological science. It places particular emphasis on cross-disciplinary activities and applications. Typical topics include: Micro and nanostructures for the device communities MEMS and NEMS Modelling, simulation and realisation of micro and nanoscale structures, devices and systems, with comparisons to experimental data Synthesis and processing Micro and nano-photonics Molecular machines, circuits and self-assembly Organic and inorganic micro and nanostructures Micro and nano-fluidics