钠离子存储器件中界面效应作用机制研究

Mechanism of Interfacial Effects in Sodium-ion Storage Devices

可充电钠离子电池被视为下一代高效能二次电池的最佳候选之一。电池充放电过程中电极表面及电极与电解质界面行为均对其性能有较大依赖性。因此,分析界面效应的特性对打造高能量密度、长期稳定的大型储能系统至关重要。虽然电极材料的特性研究已相当深入,但对钠离子电池界面效应的稳定性和高效性的研究仍显不足。现有研究成果尚未能为系统性结论提供充分的理论依据。本文回顾了钠离子储存设备中界面效应机制的研究现状,涵盖了电极材料内部的异质界面和固态电解质界面,从理论上分析了层间插入、转化反应和合金化过程中的界面效应,以及这些效应如何影响电池的整体性能。本文旨在为优化电极材料内部的异质界面及固态电解质结构提供理论基础,以提高钠离子电池的性能。同时,本文总结了几种现有的界面效应机制,并综述了目前界面效应研究面临的挑战与机遇,对其在该领域的未来发展进行了展望。

Rechargeable sodium-ion batteries(SIBs)are the next generation of secondary batteries.During charging and discharging,the behavior of sodium ion(Na+)storage at the electrode interface and electrode-electrolyte interface determines the performance of SIBs,which plays an important role in the high energy density and long cycle stability required by the large-scale energy storage battery system.Although electrode materials have been extensively studied,there is very little work on the construction of stable and efficient SIBs interfaces compared to the large number of electrode materials studied.Although there are a few researches and explorations on the mechanism of interfacial effect,the researches on the regulation strategies of interfacial effect are still in the initial stage,and the results obtained are not in-depth enough to draw systematic conclusions.Here in,the mechanism of interfacial effect in Na^(+)storage process is reviewed.The interface is divided into heterogeneous interface of electrode material,solid electrolyte interphase and cathode electrolyte interphase.The mechanism of interfacial effect in intercalation reaction,transformation reaction and alloy reaction and its influence on the overall battery performance were summarized.This provides guidance for the optimization of electrode structure and electrode-electrolyte interface structure,which is very important for the performance optimization of SIBs.In addition,it analyzes the challenges in SIB interfacial effects research and suggests several promising methods and opportunities for advancing the understanding of interfacial effects mechanisms.