Conductive Cellulose Nanofiber Enabled Thick Electrode for Compact and Flexible Energy Storage Devices

材料科学 导电体 纳米纤维 电极 储能 碳纳米纤维 电解质 超级电容器 复合材料 锂(药物) 纳米材料 纳米孔 纳米技术 碳纳米管 电化学 物理化学 内分泌学 功率(物理) 物理 化学 医学 量子力学
作者
Yudi Kuang,Chaoji Chen,Glenn Pastel,Yiju Li,Jianwei Song,Ruiyu Mi,Weiqing Kong,Boyang Liu,Yingqi Jiang,Ken Yang,Liangbing Hu
出处
期刊:Advanced Energy Materials [Wiley]
卷期号:8 (33) 被引量:207
标识
DOI:10.1002/aenm.201802398
摘要

Abstract Thick electrodes are appealing for high energy density devices but succumb to sluggish charge transfer kinetics and poor mechanical stability. Nanomaterials with large aspect ratio, such as carbon nanotubes, can help improve the charge transfer and strength of thick electrodes but represent a costly solution which hinders their utility outside of “lab scale production.” Here, a conductive nanofiber network with decoupled electron and ion transfer pathways by the conformal electrostatic assembly of neutral carbon black particles on negatively charged cellulose nanofibers is reported. After integrating with lithium iron phosphate (LFP), the conductive nanofiber network enables a compact and high‐loaded (up to 60 mg cm −2 ) electrode with robust electrical networks and shortened ion transport paths. The interconnected nanopores inherited from the conductive network function as nanosized electrolyte reservoirs surrounding the electroactive materials and acting as ion‐conducting highways across the electrode. Based on the compact electrode structure and fast charge transfer kinetics, flexible Li‐LFP batteries with outstanding areal capacity and volumetric energy density (8.8 mAh cm −2 and 538 Wh L −1 ) are developed, substantially exceeding conventional LFP‐based batteries. Given the low cost raw materials together with the scale up processability, the conductive nanofiber design provides a promising strategy toward high‐performance energy storage devices.
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