Graphite has been almost proven to be the positive material with the highest voltage and superior cycle stability for Al-graphite dual-ion battery. However, the limited energy density of graphite as positive material still blocks the future practical application. It is of great significance to further improve the energy density of the battery to satisfy the growing demand. In this regard, an edge-rich flakes-stacked graphite prepared by intentionally eroding the outer dense graphitic layer of graphite paper is demonstrated to apply in Al-graphite dual-ion battery that the chloroaluminate anions can be directly transported from edge-rich graphene nanoflakes and diffused into interior graphitic layers, which will greatly shorten the diffusion pathway, thus revealing better rate capability. The edge-rich flakes-stacked graphite paper enables to deliver a reversible capacity of ~87 mAh g⁻¹ at 50 mA g⁻¹, significantly higher than that of the untreated graphite paper electrode. More importantly, owing to the ultrahigh areal mass loading advantage, the as-assembled batteries exhibit much enhanced areal capacity (1.2 mAh cm⁻²), which is distinctly the highest among the reported graphite-based electrodes.

石墨几乎已被证明是铝石墨双离子电池具有最高电压和优异循环稳定性的正极材料。然而，作为正极材料的石墨有限的能量密度仍然阻碍了未来的实际应用。进一步提高电池的能量密度以满足不断增长的需求具有重要意义。在这方面，已证明通过有意侵蚀石墨纸的外部致密石墨层而制备的富边缘薄片状堆积石墨可用于铝-石墨双离子电池中，可以直接从富边缘石墨烯纳米薄片中转运氯铝酸盐阴离子。并扩散到内部石墨层中，这将大大缩短扩散途径，从而显示出更好的速率能力。^-1在50mA克^-1，比未处理的石墨纸电极的显著高。更重要的是，由于超高的面积质量负载优势，组装后的电池展现出大大提高的面积容量（1.2 mAh cm ^-2），这显然是报道的石墨基电极中最高的。