Organic anode materials are of great importance for the development of lithium ion batteries (LIBs) with less reliance on inorganic minerals. In this work, it is found that 2,9-dimethylquinacridone (2,9-DMQA), an organic pigment, can have excellent electrochemical performances when serving as the anode material in LIBs. 2,9-DMQA based LIB anode manifests a high specific capacity of 1150 mAh g^-1 at 0.1 A g^-1. Even at a high current density of 5.0 A g^-1, the capacity of 2,9-DMQA can still be retained at ∼385 mAh g^-1, outperforming many recently reported LIB anodes. The results from experiments and calculation suggest that 2,9-DMQA can reversibly associate with ∼ 22 Li⁺, corresponding to a theoretical capacity of 1732 mAh g^-1. Additionally, the full-cell with 2,9-DMQA as anode and LiCoO₂ as cathode can deliver the energy and power density of 325.8 Wh kg^-1 and 1137.1 W kg^-1, respectively, which are better than most of recently reported full-cells, implying the intriguing potential of the 2,9-DMQA anode in organic LIBs.

有机阳极材料对于锂离子电池（LIB）的开发非常重要，而锂离子电池对无机矿物质的依赖较少。在这项工作中，发现作为有机颜料的2,9-二甲基喹rid啶酮（2,9-DMQA）在LIB中用作阳极材料时可以具有出色的电化学性能。基于2,9-DMQA的LIB阳极在0.1 A g ^-1下显示出1150 mAh g ^-1的高比容量。即使在5.0 A g ^-1的高电流密度下，仍可以将2,9-DMQA的容量保持在约385 mAh g ^-1，优于许多最近报道的LIB阳极。实验和计算结果表明，2,9-DMQA可以与〜22 Li ⁺可逆地缔合。，对应的理论容量为1732 mAh g ^-1。此外，以2,9-DMQA为阳极，LiCoO ₂为阴极的全电池可以分别提供325.8 Wh kg ^-1和1137.1 W kg ^-1的能量和功率密度，这比最近报道的大多数电池要好。电池，这暗示了有机LIB中2,9-DMQA阳极的潜在潜力。