Wang Xiaobing, Zhuang Ruiyuan, Liu Xinyi, Hu Mingxuan, Shen Panfeng, Luo Jintao, Yang Jianhong, Wu Jianchun
School of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing 314000, China.
School of Mechanical and Electrical Engineering, Jiaxing Nanhu University, Jiaxing 314000, China.
Nanomaterials (Basel). 2024 Feb 28;14(5):442. doi: 10.3390/nano14050442.
Aluminum-ion batteries (AIBs) have become a research hotspot in the field of energy storage due to their high energy density, safety, environmental friendliness, and low cost. However, the actual capacity of AIBs is much lower than the theoretical specific capacity, and their cycling stability is poor. The exploration of energy storage mechanisms may help in the design of stable electrode materials, thereby contributing to improving performance. In this work, molybdenum disulfide (MoS) was selected as the host material for AIBs, and carbon nanofibers (CNFs) were used as the substrate to prepare a molybdenum disulfide/carbon nanofibers (MoS/CNFs) electrode, exhibiting a residual reversible capacity of 53 mAh g at 100 mA g after 260 cycles. The energy storage mechanism was understood through a combination of electrochemical characterization and first-principles calculations. The purpose of this study is to investigate the diffusion behavior of ions in different channels in the host material and its potential energy storage mechanism. The computational analysis and experimental results indicate that the electrochemical behavior of the battery is determined by the ion transport mechanism between MoS layers. The insertion of ions leads to lattice distortion in the host material, significantly impacting its initial stability. CNFs, serving as a support material, not only reduce the agglomeration of MoS grown on its surface, but also effectively alleviate the volume expansion caused by the host material during charging and discharging cycles.
铝离子电池（AIBs）因其高能量密度、安全性、环境友好性和低成本，已成为储能领域的研究热点。然而，AIBs的实际容量远低于理论比容量，且其循环稳定性较差。探索储能机制可能有助于设计稳定的电极材料，从而有助于提高性能。在这项工作中，选择二硫化钼（MoS）作为AIBs的主体材料，并使用碳纳米纤维（CNFs）作为基底制备了二硫化钼/碳纳米纤维（MoS/CNFs）电极，在260次循环后，在100 mA g的电流密度下表现出53 mAh g的残余可逆容量。通过电化学表征和第一性原理计算相结合的方式理解了储能机制。本研究的目的是研究离子在主体材料不同通道中的扩散行为及其潜在的储能机制。计算分析和实验结果表明，电池的电化学行为由MoS层间的离子传输机制决定。离子的插入导致主体材料晶格畸变，显著影响其初始稳定性。作为支撑材料的CNFs不仅减少了生长在其表面的MoS的团聚，而且有效地缓解了主体材料在充放电循环过程中引起的体积膨胀。
