最近，锂离子电容器因其兼具高能量密度、高功率密度的特点受到了广泛的关注。然而，锂资源储量有限，分布不均匀，锂离子电容器在未来有可能遇到锂资源依赖的瓶颈。钠与锂同族，理化性质相近，且钠离子电池在原理上与锂离子电池相近。因此，本项目将采用资源和成本上更具优势的钠基储能材料，设计制备低成本、高性能的新型钠离子电容器。针对缺乏可稳定嵌脱钠离子的长寿命、高倍率型电极材料、混合电容器的正负极材料动力学不匹配等问题，拟开展如下研究内容：（1）发展如NaTi2(PO4)3等在嵌脱钠过程中具有稳定结构的NASICON结构钛基化合物纳米材料；（2）发展异元素掺杂碳纳米材料，制备高容量钠离子电容器正极材料；（3）研究这些材料作为钠离子电池电极材料的储钠性能；（4）组装以异元素掺杂碳为正极、以NaTi2(PO4)3等为负极的新型钠离子电容器，发展具有高能量、功率密度、长寿命、低成本的储能器件。

Recently, lithium ion hybrid electrochemical capacitors, combining battery-type electrodes and capacitor-type electrodes (generally carbon materials), have exhibited excellent properties such as high energy and power density, long cycling life and high safety and therefore became a promising energy storage device. However, just like the development consequence of Li-ion batteries, the hungry demand for vast energy sources in modern society will conflict with the shortage of lithium resources. Nowadays, sodium-based energy-storage devices have gained increasing research interest as a potential substitute to Li-ion batteries due to their low cost, abundant natural resources. Thus, constructing sodium-based hybrid electrochemical supercapacitors is proposed an effective way in realizing high-performance energy storage systems with low cost. However, it is a major challenge to find appropriate sodium storage electrode materials with both high-rate performance and stable cycle stability upon sodium ions insertion/extraction. Besides, developing novel carbons with high capacity is another urgent demand for high-energy sodium ion hybrid capacitors. For reasons noted above, four foundamental researches are developed to address these issues: (1) Engineering more NASICON-type titanium-based compounds nanostructures via the simple solvothermal method; (2) Preparing carbon nanomaterials that doped with different elements such as N, F or organic functional groups; (3) Making clear their sodium-storage properties when used as electrodes for sodium ion batteries; (4) Designing high-performance sodium ion hybrid capacitor that is consist of carbon nanomaterilas cathode and titatium-based anode.