Amphoteric Supramolecular Nanofiber Separator for High-Performance Sodium-Ion Batteries

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuping Zhang, Hongzhi Zheng, Xing Tong, Hao Zhuo, Wu Yang, Yuling Chen, Ge Shi, Zehong Chen, Linxin Zhong, Xinwen Peng
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Abstract

The separator is an essential component of sodium-ion batteries (SIBs) to determine their electrochemical performances. However, the separator with high mechanical strength, good electrolyte wettability and excellent electrochemical performance remains an open challenge. Herein, a new separator consisting of amphoteric nanofibers with abundant functional groups was fabricated through supramolecular assembly of natural polymers for SIB. The uniform nanoporous structure, remarkable mechanical properties and abundant functional groups (e.g. −COOH, −NH2 and −OH) endow the separator with lower dissolution activation energy and higher ion migration numbers. These metrics enable the separator to lower the barrier for desolvation of Na+, accelerate the migration of Na+, and generate more stable solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI). The battery assembled with the amphoteric nanofiber separator shows higher specific capacity and better stability than that assembled with glass fiber (GF) separator.

Abstract Image

Abstract Image

用于高性能钠离子电池的两性超分子纳米纤维分离器
隔膜是钠离子电池(SIB)的重要组成部分,决定着电池的电化学性能。然而,具有高机械强度、良好电解质润湿性和优异电化学性能的隔膜仍然是一个有待解决的难题。本文通过天然聚合物的超分子组装,为 SIB 制备了一种由具有丰富官能团的两性纳米纤维组成的新型隔膜。均匀的纳米多孔结构、优异的机械性能和丰富的官能团(如 -COOH、-NH2 和 -OH)使分离器具有更低的溶解活化能和更高的离子迁移数。这些指标使隔膜能够降低 Na+ 的解溶障碍,加速 Na+ 的迁移,并产生更稳定的固态电解质相(SEI)和阴极电解质相(CEI)。与使用玻璃纤维(GF)隔膜组装的电池相比,使用两性纳米纤维隔膜组装的电池具有更高的比容量和更好的稳定性。
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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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