聚(3,4-乙烯基二氧噻吩)涂层和电解液策略表面协同保护红磷负极用于钠离子电池  

Surface Synergistic Protections on Red Phosphorus Anode Material by Poly(3,4-ethylenedioxythiophene)Coating and Electrolyte Strategy in Sodium Ion Batteries

作　　者：刘永超 吴秋杰 吴龙俊 孙毅 梁鑫 项宏发 Yong-chao Liu;Qiu-jie Wu;Long-jun Wu;Yi Sun;Xin Liang;Hong-fa Xiang(School of Materials Science and Engineering,Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽省先进功能材料与器件重点实验室,合肥230009

出　　处：《Chinese Journal of Chemical Physics》2023年第1期85-93,I0025-I0033,I0002,共19页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.52072105 and No.21676067);Anhui Provincial Natural Science Foundation(No.1908085QE178);the Fundamental Research Funds for the Central Universities(No.JZ2020YYPY0109).

摘　　要：红磷具有超高的理论容量和适宜的钠化电位,它作为一种有前途的储钠材料引起了广泛关注.然而,红磷的本征电导率较低和储钠体积变化大导致其在循环过程中极化大和容量衰减快.本文提出了通过导电聚(3,4-乙烯基二氧噻吩)涂层和电解液改性的策略表面协同保护红磷.纳米红磷被包裹在多孔碳骨架中而外部通过原位聚合的3,4-乙烯基二氧噻吩封装.多孔碳为钠离子的快速传输提供了丰富的路径,且中空的内部空间可以容纳红磷的体积膨胀.3,4-乙烯基二氧噻吩涂层能有效隔离活性材料与电解液的直接接触,便于在其表面形成稳定的固体电解质界面.另外,含有3 wt%SbF3添加剂的改性电解液可以有效稳定电极表面从而提高钠离子电池的电化学性能,特别是循环性能和倍率性能(10 A/g电流密度下容量为433 mA·h·g^(-1)).Red phosphorus has attracted more attention as a promising sodium storage material due to its ultra-high theoretical capacity and suitable sodiation potential.However,the low intrinsic electrical conductivity and large volume change of pristine red phosphorus lead to high polarization and fast capacity fading during cycling.Herein,surface synergistic protections on red phosphorus composite are successfully proposed by conductive poly(3,4-ethylenedioxythiophene)(PEDOT)coating and electrolyte strategy.Nanoscale red phosphorus is confined in porous carbon skeleton and the outside is packaged by PEDOT coating via in-situ polymerization.Porous carbon provides rich pathways for rapid Na+diffusion and empty spaces accommodate the volume expansion of red phosphorus,PEDOT coating isolates the direct contact between electrolyte and active materials to form a stable solid electrolyte interphase.In addition,the reformulated electrolyte with 3 wt%SbF3 additives can stabilize the electrode surface and thus enhance the electrochemical performance,especially cycling stability and rate capability(433 mA·h·g^(-1)at high current density of 10 A/g).

关 键 词：钠离子电池 多孔碳 红磷 表面保护 电解液 

分 类 号：TQ126.31[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]