Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, School of Chemistry, Xi'an Jiaotong University, Xi An Shi, Xi'an, 710049, P. R. China.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
ChemSusChem. 2023 Jun 9;16(11):e202202174. doi: 10.1002/cssc.202202174. Epub 2023 Apr 19.
Polypyrrole (PPy), as a representative p-type conductive polymer, attracts wide attention for energy storage materials. However, the sluggish reaction kinetics and low specific capacity of PPy impede its application in high-power lithium-ion batteries (LIBs). Herein, tubular PPy with chloride and methyl orange (MO) anionic dopants is synthesized and investigated as an anode for LIBs. The Cl and MO anionic dopants can increase the ordered aggregation and the conjugation length of pyrrolic chains, forming plentiful conductive domains and affecting the conduction channel inside the pyrrolic matrix, thereby achieving fast charge transfer and Li ion diffusion, low ion transfer energy barriers, and rapid reaction kinetics. On account of the above synergistic effect, PPy electrodes deliver a high specific capacity of 2067.8 mAh g at 200 mA g and a remarkable rate capacity of 1026 mAh g at 10 A g , realizing high energy density (724 Wh kg ) and power density (7237 W kg ) simultaneously.
聚吡咯（PPy）作为一种代表性的 p 型导电聚合物，因其在储能材料方面的应用而受到广泛关注。然而，PPy 的反应动力学缓慢和比容量低限制了其在高功率锂离子电池（LIBs）中的应用。在此，合成并研究了具有氯离子和甲基橙（MO）阴离子掺杂的管状 PPy 作为 LIBs 的阳极。Cl 和 MO 阴离子掺杂剂可以增加吡咯链的有序聚集和共轭长度，形成丰富的导电域，并影响吡咯基体内部的传导通道，从而实现快速的电荷转移和 Li 离子扩散、低的离子转移能垒和快速的反应动力学。由于上述协同效应，PPy 电极在 200 mA g 时具有 2067.8 mAh g 的高比容量，在 10 A g 时具有 1026 mAh g 的出色倍率容量，实现了高能量密度（724 Wh kg）和功率密度（7237 W kg）的同时兼顾。
