Design of Block‐Copolymer Nanoporous Membranes for Robust and Safer Lithium‐Ion Battery Separators,Advanced Science

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Design of Block‐Copolymer Nanoporous Membranes for Robust and Safer Lithium‐Ion Battery Separators
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-18 , DOI: 10.1002/advs.202003096
Hao Yang _{1,

2} , Xiansong Shi ₁ , Shiyong Chu ₁ , Zongping Shao ₁ , Yong Wang _{1,

2}

Affiliation

Lithium‐ion batteries (LIBs) suffer from unsatisfied performance and safety risks mainly because of the separators. Herein, a block copolymer (BCP) composed of robust and electrolyte‐affinitive polysulfone (PSF) and Li⁺‐affinitive polyethylene glycol (PEG) is rationally designed to prepare a new type of LIB separator. The copolymer is subjected to selective swelling, producing nanoporous membranes with PEG chains enriched along the pore walls. Intriguingly, when used as LIB separators, thus‐produced BCP membranes efficiently integrate the merits of both PSF and PEG chains, endowing the separators thermal resistance as high as 150 °C and excellent wettability. Importantly, the nanoporous separator is able to close the pores with a temperature of 125 °C, offering the battery a thermal shutdown function. The membrane exhibits ultrahigh electrolyte uptake up to 501% and a prominent ionic conductivity of 10.1 mS cm⁻¹ at room temperature. Batteries assembled with these membranes show excellent discharge capacity and C‐rate performance, outperforming batteries assembled from other separators including the extensively used Celgard 2400. This study demonstrates a facile strategy, selective swelling of block copolymer, to engineer high‐performance and safer LIB separators, which is also applicable to produce advanced copolymer‐based separators for other types of batteries.

中文翻译：

用于坚固且更安全的锂离子电池隔膜的嵌段共聚物纳米孔膜的设计

锂离子电池（LIB）的性能不理想和安全风险主要源于隔膜。^{在此，合理设计了由坚固的电解质亲和性聚砜（PSF）和Li +}亲和性聚乙二醇（PEG）组成的嵌段共聚物（BCP）来制备新型LIB隔膜。该共聚物经过选择性溶胀，产生纳米多孔膜，其中 PEG 链沿着孔壁富集。有趣的是，当用作LIB隔膜时，由此生产的BCP膜有效地结合了PSF和PEG链的优点，赋予隔膜高达150℃的耐热性和优异的润湿性。重要的是，纳米多孔隔膜能够在125℃的温度下关闭孔隙，为电池提供热关断功能。该膜在室温下表现出高达501%的超高电解质吸收率和10.1 mS cm ^{-1的显着离子电导率。}使用这些膜组装的电池表现出优异的放电容量和倍率性能，优于使用其他隔膜组装的电池，包括广泛使用的 Celgard 2400。这项研究展示了一种简单的策略，即嵌段共聚物的选择性膨胀，以设计高性能和更安全的 LIB 隔膜，这也适用于生产其他类型电池的先进共聚物基隔膜。

更新日期：2021-04-08

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