Oxime organic cathode materials for long-lifespan lithium-ion batteries†

Organic cathode materials for lithium-ion batteries have attracted considerable attention due to their environmental friendliness and abundant resource availability. However, their practical application is hindered by dissolution in electrolytes, which leads to low active material utilization and poor cycling performance. In this work, we propose a rational molecular design strategy that incorporates nitrogen atoms into carbonyl functional groups to construct oxime organic cathode materials. This design effectively reduces solubility compared to conventional carbonyl groups, thereby significantly improving cycling stability and lifespan. Notably, the 1,3,5-tris(9,10-anthracenoxime)benzene cathode exhibits exceptional electrochemical performance, achieving an impressive cycle life of 12 000 cycles. The redox mechanism of oximes was systematically investigated, demonstrating the reversible interconversion between CN–OLi and C–NO groups. These findings provide a promising design strategy for developing high-performance organic cathode materials for lithium-ion batteries.