"Understanding the role of mechanics in energy materials: A perspective"

Kejie Zhao: Yi Cui; Extreme Mechanics Letters, 10/14/16.

Additional Authors: Yi Cui

Abstract:

Mechanical issues are ubiquitous in energy storage, conversion, and harvesting. Cracks occur in solid oxide fuel cells due to the thermal stresses and non-stoichiometry of oxygen in the electrodes and electrolyte [1,2]. In photovoltaics, the low resistance to cohesive fracture of perovskite films deteriorates the structural reliability and inhibits the success of perovskite solar cells as a viable technology [3]. In capacitors using ferroelectric thin films, the mismatch strain caused by the electric polarization leads to the presence of a disruptive dead layer at the metal–dielectric interface and a capacitance drop [4,5]. In hydrogen storage, the interplay between hydrogen and localized plasticity of the fuel containers causes embrittlement [6]. In batteries, mechanical degradation compromises the capacity in current technologies and becomes a limiting factor for the implementation of highenergy-density electrodes [7]. Conversion of mechanical energy to electricity through piezoelectric and triboelectric effects has also attracted recent interests [8,9].