Improving the energy density of all-solidstate batteries by maximizing the contact area between the solid electrolyte and electrode, and stress issues

• Published in: Journal of mechanical science and technology pp. 4149 - 4157
• Main Authors: Rongzhen Zheng, 김철
• Format: Journal Article
• Language: English
• Published: 대한기계학회 01.08.2023
• Subjects: 기계공학
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-023-0731-z

Solid-state electrolyte batteries are excellent candidates for the development of safe and high-performance lithium batteries. However, the low ionic conductivity and poor interfacial contact of current solid-state electrolytes severely hinder the commercialization of solidstate batteries. Moreover, a higher stress is caused by the use of solid-state electrolytes compared with that in the case of liquid electrolytes. To increase the physical contact area between the solid/solid interfaces of all-solid-state batteries (ASSBs), this study constructed two types of interfaces with sine-curved and trapezoidal shapes to replace the general planar interface and used the Nelder-Mead algorithm to optimize the curved interface and geometric parameters of the battery cells. ASSBs are composed of a sulfide-based LI6PS5Cl solid electrolyte, a lowdensity lithium metal anode, and a high-theoretical-capacity LCO cathode. The optimization results show that the curved interface can achieve a higher energy density than a flat-interface battery. The stress caused by lithium deposition during battery charging was also calculated. The low modulus of the soft solid electrolyte significantly reduced the stress inside the battery. KCI Citation Count: 0