Shen Hailin, Zhang Wei, Zhang Yuheng, Wang Wei, Wang Min, Liu Tianyu
School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou, China.
Front Chem. 2022 Sep 29;10:949979. doi: 10.3389/fchem.2022.949979. eCollection 2022.
Layered manganese phosphoselenide (MnPSe) is expected to be a potential anode for Li ions storage due to it combines the merits of phosphorus with metal selenide. It promotes charge transfer and ensures a high theoretical capacity of up to 746 mA h g. In this work, a comprehensive study clearly demonstrated that bulk MnPSe electrode is the inability to maintain the integrity of the structure with severe detectable fracture or pulverization after full lithiation/delithiation, resulting in poor rate capability and cycling stability. Additionally, exfoliated few-layered MnPSe nanoflakes by the ultrasonic method show enhanced electrical conductivity and resistance to volume expansion. It has a high initial discharge/charge capacity reaching to 524/796 mA h g and outstanding cycling stability with charge capacities of 709 mA h g after 100 cycles at 0.2 A g within the potential window of 0.005-3 V vs. Li/Li. While further improving the cycles, the retention rate was still held at ∼72% after 350 cycles. This work provides new insights into exploiting new novel layered materials, such as MnPSe as anodes for lithium-ion batteries.
层状锰磷硒化物（MnPSe）有望成为一种潜在的锂离子存储负极材料，因为它结合了磷和金属硒化物的优点。它促进电荷转移，并确保高达746 mA h g的高理论容量。在这项工作中，一项全面的研究清楚地表明，块状MnPSe电极在完全锂化/脱锂后无法保持结构的完整性，会出现严重的可检测到的断裂或粉化，导致倍率性能和循环稳定性较差。此外，通过超声方法制备的剥离少层MnPSe纳米片显示出增强的导电性和抗体积膨胀能力。它具有高达524/796 mA h g的高初始放电/充电容量，并且在0.005 - 3 V（相对于Li/Li）的电位窗口内，在0.2 A g下循环100次后，充电容量为709 mA h g，具有出色的循环稳定性。在进一步增加循环次数时，在350次循环后保持率仍保持在约72%。这项工作为开发新型层状材料，如将MnPSe用作锂离子电池负极提供了新的见解。
