A New (Trifluoromethane)Sulfonylimide Single-Ion Conductor with PEG Spacer for All-Solid-State Lithium-Based Batteries

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2024-11-15 DOI:10.1021/acsmaterialslett.4c0164710.1021/acsmaterialslett.4c01647

Gabriele Lingua, Vladislav Y. Shevtsov, Petr S. Vlasov, Laura Puchot, Claudio Gerbaldi* and Alexander S. Shaplov*,

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引用次数: 0

Abstract

The choice of ionic-liquid-like monomers (ILM) for single-ion conducting polyelectrolytes (SICPs) is crucial for the performance of all-solid-state lithium batteries. In the current study, we propose a novel approach for development of SICPs via design and synthesis of a new ILM with long poly(ethylene oxide) spacer between methacrylic group and (trifluoromethane)sulfonylimide anion. Its homopolymer shows an ionic conductivity that is ∼5 orders of magnitude higher (9.2 × 10^–8 S cm^–1 at 25 °C), in comparison with previously reported analogues, while the conductivity of its random copolymer with poly(ethylene glycol)methyl ethermethacrylate reaches the levels of 10^–6 and 10^–5 S cm^–1 at 25 and 70 °C, respectively. The copolymer provides excellent thermal (T_onset ≈ 200 °C) and electrochemical (4.5 V vs Li⁺/Li) stabilities, good compatibility with Li metal, and effective suppression of dendrite growth. Li/SICP/LiFePO₄ cells are capable of reversibly operating at different C rates, demonstrating excellent Coulombic efficiency and retaining specific capacity upon prolonged charge/discharge cycling at a relatively high current rate (C/5) at 70 °C.

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全固态锂基电池用新型（三氟甲烷）磺酰亚胺单离子导体与PEG间隔

选择离子液体样单体（ILM）作为单离子导电聚电解质（sicp）对于全固态锂电池的性能至关重要。在目前的研究中，我们提出了一种新的方法来开发SICPs通过设计和合成一个新的ILM长聚（环氧乙烷）间隔在甲基丙烯酸基团和（三氟甲烷）磺酰亚胺阴离子之间。与先前报道的类似物相比，其均聚物的离子电导率高出约5个数量级（25°C时为9.2 × 10-8 S cm-1），而其与聚乙二醇醚甲基丙烯酸甲酯的无规共聚物的电导率在25°C和70°C时分别达到10-6和10-5 S cm-1的水平。该共聚物具有优异的热稳定性（Tonset≈200°C）和电化学稳定性（4.5 V vs Li+/Li），与锂金属具有良好的相容性，并能有效抑制枝晶生长。Li/SICP/LiFePO4电池能够在不同的C速率下可逆工作，在70°C下以相对高的电流速率（C/5）长时间充放电循环时表现出优异的库仑效率和保持比容量。

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

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.