Croconic acid disodium salt (CADS), a renewable or recyclable organic compound, is investigated as an anode material in sodium ion battery for the first time. The pristine micro-sized CADS delivers a high capacity of 246.7 mAh g⁻¹, but it suffers from fast capacity decay during charge/discharge cycles. The detailed investigation reveals that the severe capacity loss is mainly attributed to the pulverization of CADS particles induced by the large volume change during sodiation/desodiation rather than the generally believed dissolution of CADS in the organic electrolyte. Minimizing the particle size can effectively suppress the pulverization, thus improving the cycling stability. Wrapping CADS with graphene oxide by ultrasonic spray pyrolysis can enhance the integration and conductivity of CADS electrodes, thus providing a high capacity of 293 mAh g⁻¹.

克可可酸二钠盐（CADS）是一种可再生或可回收的有机化合物，首次被用作钠离子电池的负极材料。原始的微型CADS可提供246.7 mAh g ^-1的高容量，但在充电/放电周期中会遭受容量快速衰减的困扰。详细的研究表明，严重的容量损失主要归因于在有机化/脱氧过程中体积的大变化引起的CADS颗粒的粉化，而不是一般认为的CADS在有机电解质中的溶解。最小化粒径可以有效地抑制粉碎，从而改善循环稳定性。通过超声喷雾热解用氧化石墨烯包裹CADS可以增强CADS电极的集成度和电导率，从而提供293 mAh g ^-1的高容量。