Abstract Commercial LiFePO4 (LFP) electrode still cannot meet the demand of high energy density lithium-ion batteries as a result of its low theoretical specific capacity (170 mA h g−1). Instead of traditional electrochemical inert polyvinylidene fluoride (PVDF), the incorporation of multifunctional polymeric binder becomes a possible strategy to overcome the bottleneck of LFP cathode. Herein, a novel polyimide (PI) binder was synthesized through a facile hydrothermal polymerization route. The PI binder exhibits better connection between active particles with uniform dispersion than that of PVDF. The multifunctional PI binder not only shows well dispersion stability in the organic electrolyte, but also contributes to extra capacity because of the existence of electrochemical active carbonyl groups in the polymer chain. Besides, the high intrinsic ion conductivity of PI also results in promoted ion transfer kinetic. Consequently, the LFP cathode using PI binder (LFP–PI) shows larger capacity and better rate capability than LFP cathode with PVDF binder (LFP–PVDF). Meanwhile, the superior binding ability also endows LFP–PI with great cycling stability compared to the LFP–PVDF electrode.

中文翻译：

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将氧化还原活性聚酰亚胺粘合剂掺入 LiFePO4 正极以实现高倍率电化学储能

摘要 商用 LiFePO4 (LFP) 电极理论比容量低（170 mA h g-1），仍不能满足高能量密度锂离子电池的需求。与传统的电化学惰性聚偏二氟乙烯 (PVDF) 不同，多功能聚合物粘合剂的加入成为克服 LFP 阴极瓶颈的可能策略。在此，通过简便的水热聚合途径合成了一种新型聚酰亚胺 (PI) 粘合剂。与 PVDF 相比，PI 粘合剂在分散均匀的活性颗粒之间表现出更好的连接。多功能 PI 粘合剂不仅在有机电解质中表现出良好的分散稳定性，而且由于聚合物链中电化学活性羰基的存在，还有助于增加容量。除了，PI 的高本征离子电导率也促进了离子转移动力学。因此，使用 PI 粘合剂的 LFP 阴极（LFP-PI）比使用 PVDF 粘合剂的 LFP 阴极（LFP-PVDF）显示出更大的容量和更好的倍率性能。同时，与 LFP-PVDF 电极相比，优异的结合能力也使 LFP-PI 具有更好的循环稳定性。