二氧化锰由于其丰富的晶体形状,是钠离子电池的理想阳极。然而,它的低电导率,低可逆放电容量,慢扩散动力学,循环稳定性差限制了其工业应用的潜力。各种形态的二氧化锰(MnO2)的设计,比如纳米线,纳米棒,和纳米花,已被证明有效地增强其电化学性能。堆叠纳米线结构是令人感兴趣的,因为它们通过形成互连网络来增加开放空间。从而促进钠离子的有利扩散途径。同时,电解质接触面积的显著增加有效地减轻了由与钠离子的重复迁移和插入相关的体积膨胀引起的应变。在前人研究的基础上,本文介绍了在碳布(CC)上组装的柔性MnO2/聚苯胺(MnO2/PANI)纳米线的结构设计,MnO2改性的创新。与传统的MnO2纳米线相比,MnO2/PANI纳米线表现出增强的结构稳定性和改进的动态性能,从而标志着他们的材料性能的显著进步。该MnO2/PANI复合材料在0.1Ag-1的电流密度下60次循环后表现出约200mAhg-1的倍率容量,并且即使在相同电流密度下200次循环后仍保持182mAhg-1的倍率容量。这项研究不仅为MnO2/PANI纳米线储能的潜在机制提供了新的见解,而且为其作为钠离子电池阳极的进一步开发和优化铺平了道路。从而为研究和应用开辟了新的途径。
Manganese dioxide is an ideal anode for sodium-ion batteries due to its rich crystal shapes. However, its low conductivity, low reversible discharge capacity, slow diffusion kinetics, and poor cyclic stability limit its potential for industrial application. The design of manganese dioxide (MnO2) with various morphologies, such as nanowires, nanorods, and nanoflowers, has proven effective in enhancing its electrochemical performance. Stacking nanowire structures is of interest as they increase the open space by forming an interconnected network, thus facilitating favorable diffusion pathways for sodium ions. Concurrently, the substantial increase in the electrolyte contact area efficiently mitigates the strain induced by the volume expansion associated with the repetitive migration and insertion of sodium ions. Based on previous research, this work presents the structural design of flexible MnO2/polyaniline (MnO2/
PANI) nanowires assembled on carbon cloth (CC), an innovation in MnO2 modification. Compared to conventional MnO2 nanowires, the MnO2/
PANI nanowires exhibit enhanced structural stability and improved dynamic performance, thereby marking a significant advancement in their material properties. This MnO2/
PANI composite exhibits a rate capacity of approximately 200 mA h g-1 after 60 cycles at a current density of 0.1 A g-1, and maintains a rate capacity of 182 mA h g-1 even after 200 cycles under the same current density. This study not only provides new insights into the underlying mechanisms governing energy storage in MnO2/
PANI nanowires but also paves the way for their further development and optimization as anodes for sodium-ion batteries, thereby opening up fresh avenues for research and application.