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Abstract：
Phosphorus (P) and TiO2 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 TiO2 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 TiO2-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 TiO2. 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-TiO2-PPy, achieving a capacity of up to 1763 mAh/g over 1000 cycles.
摘要：
磷（P）和TiO2由于其高比容量而被广泛研究作为锂离子电池（LIBs）的负极材料。然而,P在充电和放电循环过程中受到低电导率和显着体积变化的限制，而TiO2受到低电导率和缓慢的锂离子扩散的阻碍。为了解决这些问题,我们合成了P-聚吡咯（PPy）和TiO2-PPy的有机-无机杂化阳极材料，通过吡咯单体在纳米级无机材料存在下的原位聚合。与纯P和TiO2相比,这些杂化阳极材料显示出更高的循环稳定性和容量。增强归因于PPy聚合物的导电性和柔韧性，这提高了阳极材料的导电性，并有效地缓冲了体积变化，以维持充放电过程中的结构完整性。此外,PPy可以进行聚合以形成用于阳极材料的多组分复合材料。在这项研究中,我们成功合成了三元复合负极材料，P-TiO2-PPy,在1000次循环中实现高达1763mAh/g的容量。
