A three-dimensional composite carbon material (CNT@MPC) showing coaxial cable-like structure was prepared by carbon nanotubes (CNTs) and glucose through hydrothermal method. The ternary composite (PTCDA/CNT@MPC) was synthesized by coating a layer of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) molecules on the surface of CNT@MPC composite carbon material. The sodium ion battery was assembled using the ternary composite as the positive electrode material, and sodium metal as the negative electrode. The results show that the electrochemical performance of PTCDA/CNT@MPC composite is much better than that of pure PTCDA. The first discharge capacity is 131.2 mAh g⁻¹ as the current density is 0.1 A g⁻¹, which is close to its theoretical specific capacity of 135 mAh g⁻¹. In particular, the battery shows better discharge properties at higher discharge current rate. When the current density reaches 10 A g⁻¹, the PTCDA/CNT@MPC electrode material is still able to attain a superior capacity of 90.1 mAh g⁻¹. This is due to the higher conductivity of CNT@MPC composite carbon material, which not only enhances the conductivity of PTCDA, but also increases the transport channel of ions, so as to increase the adsorption of sodium ions into the composite positive electrode. Therefore, the reversible capacity and cycle life of the composite electrode are significantly improved, which exhibit the excellent intercalation and de-intercalation performance for sodium ions and the charge-discharge rate performance.

以碳纳米管（CNTs）和葡萄糖为原料，通过水热法制备了具有同轴电缆状结构的三维复合碳材料（CNT@MPC）。三元复合材料（PTCDA/CNT@MPC）是通过在CNT@MPC复合碳材料表面包覆一层3,4,9,10-苝四甲酸二酐（PTCDA）分子来合成的。以三元复合材料为正极材料，金属钠为负极材料，组装钠离子电池。结果表明，PTCDA/CNT@MPC复合材料的电化学性能远优于纯PTCDA。当电流密度为0.1 A g ^{-1 时}，首次放电容量为131.2 mAh g ^-1，接近其理论比容量135 mAh g ^-1. 特别是，电池在较高的放电电流速率下表现出更好的放电特性。当电流密度达到10 A g ^{-1 时}，PTCDA/CNT@MPC 电极材料仍能达到90.1 mAh g ^-1的优异容量。这是由于CNT@MPC复合碳材料具有更高的导电性，不仅增强了PTCDA的导电性，而且增加了离子的传输通道，从而增加了钠离子对复合正极的吸附。因此，复合电极的可逆容量和循环寿命显着提高，表现出优异的钠离子嵌入和脱嵌性能和充放电倍率性能。