用于高级超级电容器的基于再生纤维素的耐热、坚固和亲水隔膜,Small

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用于高级超级电容器的基于再生纤维素的耐热、坚固和亲水隔膜
Small ( IF 13.0 ) Pub Date : 2022-11-10 , DOI: 10.1002/smll.202205152
Hongqin Wu _{1,

2} , Jiahui Mu _{1,

2} , Yanglei Xu _{1,

2} , Feng Xu _{1,

2} , Shri Ramaswamy ₃ , Xueming Zhang _{1,

2}

Affiliation

超级电容器（SC）中的隔膜通常存在机械性能低、离子传输和电解质润湿性受限以及热稳定性差等缺陷，阻碍了超级电容器的发展。在此，设计了高性能再生纤维素 (RC) 基隔膜，其通过有效水解蚀刻无机 CaCO _3制成来自填充 RC 膜的纳米粒子。所制备的 RC 隔膜表现出优异的综合性能，如更高的拉伸强度 (75.83 MPa) 和热稳定性 (200 °C)，优于商用聚丙烯隔膜 (Celgard 2500)，即使在温度超过 200 °C。得益于其亲水性、高孔隙率和出色的电解液吸收率 (208.5%)，RC 隔膜表现出离子的快速传输和渗透性，比经过验证的商业非织造聚丙烯隔膜 (NKK -MPF30AC-100) 高 2.5 倍通过在 1.0 m Na ₂ SO ₄中的电化学测试电解质。结果表明，多孔 RC 隔膜具有优异的电解质润湿性、机械强度和高热稳定性等独特优势，是一种很有前途的高性能和安全性 SC 隔膜。

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Heat-Resistant, Robust, and Hydrophilic Separators Based on Regenerated Cellulose for Advanced Supercapacitors

Separators in supercapacitors (SCs) typically suffer from defects of low mechanical property, limited ion transport, and electrolyte wettability, and poor thermal stability, impeding the development of SCs. Herein, high-performance regenerated cellulose (RC) based separators are designed that are fabricated by effective hydrolytic etching of inorganic CaCO₃ nanoparticles from a filled RC membrane. The as-prepared RC separator displays excellent comprehensive performances such as higher tensile strength (75.83 MPa) and thermal stability (200 °C), which is superior to commercial polypropylene-based separator (Celgard 2500) and sufficient to maintain their structural integrity even at temperatures in excess of 200 °C. Benefiting from its hydrophilicity, high porosity, and outstanding electrolyte uptake rate (208.5%), the RC separator exhibits rapid transport and permeability of ions, which is 2.5× higher than that of the commercial nonwoven polypropylene separator (NKK -MPF30AC-100) validated by electrochemical tests in the 1.0 m Na₂SO₄ electrolyte. Results show that porous RC separator with unique advantages of superior electrolyte wettability, mechanical robustness, and high thermal stability, is a promising separator for SCs with high-performance and safety.

更新日期：2022-11-10

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