面相高效储钠的钛基材料/MXene复合自支撑柔性电极的构筑

针对目前柔性钠离子电池中电极电化学性能与机械性能皆有待提高的问题，本项目拟发展异质结构材料构筑方法学，以自支撑无添加剂的钛基材料/MXene异质柔性电极为研究对象，发挥钛基材料为新型储能主体及MXene为多功能导电粘结剂和柔性基底的协同作用，为柔性储能电极的优化提供新思路。同时结合多种表征手段和理论计算，分析异质结构中界面原子排列和电子结构，聚焦形变状态下钠离子存储的电化学过程，从本质上认识和理解电极材料储钠过程中的离子浓度和形变引发的双重应力场下离子-电子耦合传输机制和演化规律，建立微观原子排列-宏观电化学储能性能和机械性能之间的构效关系，以期推动长效低成本柔性钠离子电池的发展和应用。

In order to simultaneously improve the electrochemical performance and mechanical properties of flexible electrodes for sodium ion battery, this project aims at developing heterogenous fabrication methodology for a self-supported and additive-free Ti-based materials/MXene flexible electrode. Ti-based materials can serve as the hosts for sodium storage, while MXene stands out as a multifunctional conductive binder and flexible substrate. This design may open an avenue for flexible electrode optimization. Combining with a variety of characterization methods and theoretical simulations, this project also focuses on the electrochemical steps under deformation to understand the evolution of stress from concentration and deformation with sodiation essentially. Then, the structure-performance relationship between microscopic atomic arrangement at interfaces and macroscopic electrochemical performance/mechanical properties will be established with the view to promote the development of long-term low-cost flexible sodium ion batteries. The accomplishment of this project shall lead to significant progress in fundamental research and device applications of flexible sodium ion battery.