Abstract A pairwise coupling of 0D Super-P (SP), 1D carbon nanotubes (CNTs), and 2D graphene nanosheets (GNs) into binary carbon-based conductive additives was used here for the LiFePO4 cathode in lithium-ion batteries. For comparison, the LiFePO4 cathode with SP, CNT, or GN unitary conductive agent was also examined. Electrochemical test results suggest that the cathodes with binary conducting additives present greatly improved electrochemical performance than the traditional cathode system (only SP used). Especially, the LiFePO4 cathode containing 3% CNT component exhibits the highest specific capacity and the best cycling stability among all the cathodes with binary conducting additives, indicating that an appropriate amount of CNTs is critical in enhancing the conductivity and practical capacity output. However, an excess of CNTs leads to entangling with each other, hampering the uniform distribution of active materials and resulting in poor electrode performance. Furthermore, the combination of CNT and GN can effectively improve the capacity and cycling stability of the LiFePO4 cathodes due to the synergistic effect of 3D conductive networks constructed by the two.

中文翻译：

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LiFePO4正极中的二元碳基添加剂具有良好的锂存储

摘要 0D Super-P (SP)、1D 碳纳米管 (CNTs) 和 2D 石墨烯纳米片 (GNs) 成对耦合成二元碳基导电添加剂用于锂离子电池中的 LiFePO4 阴极。为了比较，还检查了具有 SP、CNT 或 GN 单一导电剂的 LiFePO4 阴极。电化学测试结果表明，与传统阴极系统（仅使用 SP）相比，具有二元导电添加剂的阴极的电化学性能大大提高。特别是，含有 3% CNT 组分的 LiFePO4 正极在所有具有二元导电添加剂的正极中表现出最高的比容量和最佳的循环稳定性，表明适量的 CNT 对于提高电导率和实际容量输出至关重要。然而，过量的碳纳米管会导致相互缠绕，阻碍活性材料的均匀分布并导致电极性能不佳。此外，由于两者构建的 3D 导电网络的协同效应，CNT 和 GN 的组合可以有效提高 LiFePO4 正极的容量和循环稳定性。