Kang Chiwon, Song Kibum, Ha Seungho, Sung Yujin, Kim Yejin, Shin Keun-Young, Kim Byung Hyo
Department of Materials Science and Engineering, Soongsil University, Seoul 06978, Republic of Korea.
Department of Green Chemistry and Materials Engineering, Soongsil University, Seoul 06978, Republic of Korea.
Nanomaterials (Basel). 2024 Jul 2;14(13):1138. doi: 10.3390/nano14131138.
Phosphorus (P) and TiO have been extensively studied as anode materials for lithium-ion batteries (LIBs) due to their high specific capacities. However, P is limited by low electrical conductivity and significant volume changes during charge and discharge cycles, while TiO is hindered by low electrical conductivity and slow Li-ion diffusion. To address these issues, we synthesized organic-inorganic hybrid anode materials of P-polypyrrole (PPy) and TiO-PPy, through in situ polymerization of pyrrole monomer in the presence of the nanoscale inorganic materials. These hybrid anode materials showed higher cycling stability and capacity compared to pure P and TiO. The enhancements are attributed to the electrical conductivity and flexibility of PPy polymers, which improve the conductivity of the anode materials and effectively buffer volume changes to sustain structural integrity during the charge and discharge processes. Additionally, PPy can undergo polymerization to form multi-component composites for anode materials. In this study, we successfully synthesized a ternary composite anode material, P-TiO-PPy, achieving a capacity of up to 1763 mAh/g over 1000 cycles.
由于磷（P）和二氧化钛（TiO）具有高比容量，它们作为锂离子电池（LIBs）的负极材料已被广泛研究。然而，磷受到低电导率以及充放电循环过程中显著体积变化的限制，而二氧化钛则受到低电导率和锂离子扩散缓慢的阻碍。为了解决这些问题，我们通过在纳米级无机材料存在的情况下吡咯单体的原位聚合，合成了P-聚吡咯（PPy）和TiO-PPy的有机-无机混合负极材料。与纯P和TiO相比，这些混合负极材料表现出更高的循环稳定性和容量。这种增强归因于PPy聚合物的电导率和柔韧性，它们提高了负极材料的电导率，并有效地缓冲体积变化以在充放电过程中维持结构完整性。此外，PPy可以进行聚合以形成用于负极材料的多组分复合材料。在本研究中，我们成功合成了三元复合负极材料P-TiO-PPy，在1000次循环中实现了高达1763 mAh/g的容量。
