材料科学
造纸
制作
纳米技术
镁
成核
沉积(地质)
化学工程
复合材料
冶金
替代医学
有机化学
病理
沉积物
医学
工程类
生物
化学
古生物学
作者
Jingxuan Bi,Yuhang Liu,Zhuzhu Du,Ke Wang,Wanqing Guan,Haiwei Wu,Wei Ai,Wei Huang
标识
DOI:10.1002/adma.202309339
摘要
Abstract The development of advanced magnesium metal batteries (MMBs) has been hindered by longstanding challenges, such as the inability to induce uniform magnesium (Mg) nucleation and the inefficient utilization of Mg foil. This study introduces a novel solution in the form of a flexible, lightweight, paper‐based scaffold that incorporates gradient conductivity, magnesiophilicity, and pore size. This design is achieved through an industrially adaptable papermaking process in which the ratio of carboxylated multi‐walled carbon nanotubes to softwood cellulose fibers is meticulously adjusted. The triple‐gradient structure of the scaffold enables the regulation of Mg ion flux, promoting bottom‐up Mg deposition. Owing to its high flexibility, low thickness, and reduced density, the scaffold has potential applications in flexible and wearable electronics. Accordingly, the triple‐gradient electrodes exhibit stable operation for over 1200 h at 3 mA cm −2 /3 mAh cm −2 in symmetrical cells, markedly outperforming the non‐gradient and metallic Mg alternatives. Notably, this study marks the first successful fabrication of a flexible MMB pouch full cell, achieving an impressive volumetric energy density of 244 Wh L −1 . The simplicity and scalability of the triple‐gradient design, which uses readily available materials through an industrially compatible papermaking process, open new doors for the production of flexible, high‐energy‐density metal batteries.
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