Ion-Sieving Dual-Scale Asymmetric Cellulose Membrane as a Sustainable Paper-Based Separator for Ultra-Stable Zinc AnodesOA
Conventional glass fiber separators used in aqueous zincion batteries(ZIBs) are inadequate in suppressing Zn dendrite growth and parasitic reactions due to unregulated ion transport. Here, we design a fully biodegradable and dual-scale asymmetric paper-based membrane that synergistically couples a macroporous paper scaffold with a surface layer of carboxylated nanoporous cellulose nanofibers(CNFs) for ion regulation. This dual-scale architecture establishes coordination-assisted ion-hopping pathways via Zn^(2+)–COOH interactions, homogenizing Zn^(2+) flux to enable uniform nucleation and inhibit dendrites. Simultaneously, the nanoporous and negatively charged CNF layer functions as an ion sieve, preferentially conducting Zn^(2+) while restricting water mobility and polyiodide shuttling, thereby mitigating side reactions. When deployed as a separator, the membrane enables an ultra-stable ZnZn symmetric cell cycling over 1,900 h at 1.0 mA cm^(-2) and an average Coulombic efficiency of 97.3% in ZnCu cells, achieving a sixfold lifespan extension over commercial glass fiber separators. The corresponding ZnI_(2) full cell retains a specific capacity of 172.8 mAh g^(-1) after 4,000 cycles at 2.0 A g^(-1), underscoring its efficacy in suppressing shuttle effects. This cellulose-based design reduces separator cost by 83% while ensuring full biodegradability, offering a practical and sustainable pathway toward high-performance ZIBs.
Xinlong Liu;Junze Zhang;Cuiqin Fang;Yana Xiao;Yujue Yang;Shuai Wang;Qingjun Yang;Yaopeng Wu;Bingang Xu
Research Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of China Research Centre for Resources Engineering Towards Carbon Neutrality,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of ChinaResearch Institute for Intelligent Wearable Systems,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of China Research Centre for Resources Engineering Towards Carbon Neutrality,The Hong Kong Polytechnic University,Kowloon,999077 Hong Kong,People’s Republic of China
信息技术与安全科学
Cellulose separatorGlass fiberDual-scaleBiodegradableZinc anode
《Nano-Micro Letters》 2026 (9)
P.290-307,18
the Hong Kong Polytechnic University for funding support (Project No.:1-CDPF, 1-WZ1Y, 1-BBH6, 4-YWER) of this work。
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