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一种用于全固态锂基电池的含聚乙二醇间隔基的新型（三氟甲烷）磺酰亚胺单离子导体。

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

作者信息

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

机构信息

GAME Lab, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.

National Reference Center for Electrochemical Energy Storage (GISEL) - INSTM,Via G. Giusti 9, 50121 Firenze, Italy.

出版信息

ACS Mater Lett. 2024 Nov 15;6(12):5429-5437. doi: 10.1021/acsmaterialslett.4c01647. eCollection 2024 Dec 2.

DOI:10.1021/acsmaterialslett.4c01647
PMID:39639955
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11616446/
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 S cm 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 and 10 S cm at 25 and 70 °C, respectively. The copolymer provides excellent thermal ( ≈ 200 °C) and electrochemical (4.5 V vs Li/Li) stabilities, good compatibility with Li metal, and effective suppression of dendrite growth. Li/SICP/LiFePO cells are capable of reversibly operating at different rates, demonstrating excellent Coulombic efficiency and retaining specific capacity upon prolonged charge/discharge cycling at a relatively high current rate (/5) at 70 °C.

摘要

用于单离子导电聚电解质（SICP）的类离子液体单体（ILM）的选择对于全固态锂电池的性能至关重要。在当前的研究中，我们提出了一种开发SICP的新方法，即通过设计和合成一种新型ILM，该ILM在甲基丙烯酸基团和（三氟甲烷）磺酰亚胺阴离子之间具有长的聚环氧乙烷间隔基。与先前报道的类似物相比，其均聚物显示出离子电导率高约5个数量级（25℃时为9.2×10 S cm），而其与聚（乙二醇）甲基醚甲基丙烯酸酯的无规共聚物的电导率在25℃和70℃时分别达到10和10 S cm的水平。该共聚物具有出色的热稳定性（≈200℃）和电化学稳定性（相对于Li/Li为4.5 V），与锂金属具有良好的相容性，并能有效抑制枝晶生长。Li/SICP/LiFePO电池能够在不同速率下可逆运行，在70℃以相对较高的电流速率（/5）进行长时间充放电循环时，表现出出色的库仑效率并保持比容量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/5122335ac37a/tz4c01647_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/4ec679138542/tz4c01647_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/65d1361871a5/tz4c01647_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/d0bcc7537250/tz4c01647_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/660202d5b545/tz4c01647_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/5122335ac37a/tz4c01647_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/4ec679138542/tz4c01647_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/65d1361871a5/tz4c01647_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/d0bcc7537250/tz4c01647_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/660202d5b545/tz4c01647_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f854/11616446/5122335ac37a/tz4c01647_0002.jpg

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