Developing advanced organic cathodes with significant charge–discharge performances would prove a potential alternative for traditionally inorganic cathode materials of lithium-ion batteries in the future. Herein, a conductive polymer as electrode with improved electrochemical performances was reported. Polyaniline (PANI) with fibrous morphology was firstly polymerized by using perchloric acid (HClO₄) as the large molecular doped acid. Furthermore, the cross-linking PANI was prepared with using triphenylamine as the cross-linkers and p-phenylenediamine as the molecular chain extender. Applied as the cathode of lithium-ion batteries, the cross-linking PANI fibers with moderate cross-linking degree exhibited an improved electrochemical and cell performances, in which it presented a highest discharge specific capacity of 138.5 mAh·g⁻¹ and a relatively stable capacity retention of around 126.3 mAh·g⁻¹ after 150 cycles. Also, the cross-linking PANI exhibited the improved rate capabilities, and it could still provide a discharge specific capacity of 92.5 mAh·g⁻¹ even at a higher current density of 500 mA.g⁻¹, which is obviously higher than that of pure PANI. The work presented herein demonstrated that the cross-linking for conductive polymers was a potential way to obtain the improved electrochemical performances for the polymer-based electrode material.

开发具有显着充放电性能的先进有机正极将成为未来锂离子电池传统无机正极材料的潜在替代品。本文报道了一种具有改进电化学性能的导电聚合物作为电极。具有纤维形态的聚苯胺（PANI）首先使用高氯酸（HClO ₄) 作为大分子掺杂酸。此外，以三苯胺为交联剂，对苯二胺为分子增链剂制备了交联聚苯胺。作为锂离子电池的正极，中等交联度的交联PANI纤维表现出改善的电化学和电池性能，其中最高放电比容量为138.5 mAh·g ^-1并且相对稳定150 次循环后的容量保持率约为 126.3 mAh·g ^-1。此外，交联PANI表现出更高的倍率性能，即使在500 mA.g ^-1的更高电流密度下，它仍然可以提供92.5 mAh·g ^-1的放电比容量，明显高于纯PANI。本文提出的工作表明，导电聚合物的交联是获得改进的聚合物基电极材料电化学性能的潜在途径。