Zhan Haifei, Dong Bin, Zhang Gang, Lü Chaofeng, Gu Yuantong
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, P. R. China.
School of Mechanical, Medical and Process Engineering, Queensland University of Technology (QUT), Brisbane, QLD, 4001, Australia.
Small. 2022 Sep;18(38):e2203887. doi: 10.1002/smll.202203887. Epub 2022 Aug 15.
A compact, stable, sustainable, and high-energy density power supply system is crucial for the engineering deployment of mobile electromechanical devices/systems either at the small- or large-scale. This work proposes a spiral-based mechanical energy storage scheme utilizing the newly synthesized 2D diamane. Atomistic simulations show that diamane spiral can achieve a high theoretical gravimetric energy density of about 564 Wh kg , about 14 500 times the steel spring. The interlayer friction between diamane is found to cause a strong stick-slip effect that results in local stress/strain concentration. As such, the energy storage capacity of the diamane spiral can be tuned by suppressing the influence from the interlayer friction. Simulations affirm that higher gravimetric energy density can be achieved by reducing the turn number or adopting a low friction contact pair. The fundamental principles that dominate the energy storage capacity of the spiral spring are theoretically analyzed, respectively. The obtained insights suggest that the 2D vdW solids can be promising candidates to construct spiral structures with a high gravimetric energy density. This work should be beneficial for the design of reliable, stable, and sustainable nanoscale mechanical energy storage schemes that can be used as an alternative low-carbon footage energy supplier for novel micro-/nanoscale devices or systems.
一个紧凑、稳定、可持续且具有高能量密度的电源系统对于小型或大型移动机电设备/系统的工程部署至关重要。这项工作提出了一种基于螺旋的机械能存储方案，该方案利用了新合成的二维二氢金刚石。原子模拟表明，二氢金刚石螺旋可以实现约564 Wh/kg的高理论重量能量密度，约为钢弹簧的14500倍。研究发现，二氢金刚石层间摩擦会导致强烈的粘滑效应，从而导致局部应力/应变集中。因此，可以通过抑制层间摩擦的影响来调节二氢金刚石螺旋的储能能力。模拟结果证实，通过减少匝数或采用低摩擦接触对可以实现更高的重量能量密度。分别从理论上分析了主导螺旋弹簧储能能力的基本原理。所得见解表明，二维范德华固体有望成为构建具有高重量能量密度螺旋结构的候选材料。这项工作将有助于设计可靠、稳定和可持续的纳米级机械能存储方案，这些方案可作为新型微/纳米级设备或系统的替代低碳储能能源供应商。
