▎ 摘　　要

Quinone molecules hold the promise as electrodes for sodium ion batteries (SIBs). Made of earth abundant elements, these organic materials offer rapid multi-electron redox reaction at high theoretical specific capacities. However, they often display poor cycle life and low rate of performance duc to a low electrical conductivity and a high solubility in an organic electrolyte. In this work, we report a 1,5-dihydroxy anthraquinone sodium salt (DHAQNa) synthesized by using simple neutralization and its composite with graphene (DHAQNa/G) prepared through a simple ball-milling and dispersed-deposition process. Compared with DHAQNa, DHAQNa/G exhibit higher capacity (176 mAh g(-1) vs. 159 mAh g(-1)) and better cycling performance (similar to 151 mAh g(-1) vs similar to 90 mAh g(-1) after 100 cycles at 0.1C), which are attributed to the suppressed dissolution and the enhanced electrical conductivity owing to the formation of oxygen-sodium bonds and the introduction of graphene, respectively. Also, the excellent electrical conductivity of DHAQNa/G is confirmed by density of states calculations. The strategy demonstrated here should be widely applicable to other organic electrode materials.