Stress engineering for crack and dendrite prevention in solid electrolytes via ion implantation

作者：C. Thomas, Wei Zhang, M. Chancey, Marco di Michiel, Kaitlin Garman, Yangyang Wang, S. Harris, D. Finegan, Yongqiang Wang, Chunmei Ban · 发表于：Cell Reports Physical Science · 年份：2025 · DOI：10.1016/j.xcrp.2025.102544 · 被引用次数：3

All-solid-state batteries have emerged as a promising solution to mitigate the safety concerns associated with traditional liquid electrolytes, thereby reducing the incidence of battery fires and the need for expensive on-board fire mitigation strategies. However, the practical implementation of solid-state electrolytes (SEs) faces serious challenges, in large part because lithium dendrites readily penetrate through SEs, leading to short circuits and cell failure. Unlike existing methodologies involving high stack pressures or buffer layers, our approach to mitigating dendrite penetration focuses on inducing residual compressive stress at the surface of SEs through innovative surface modification. Specifically, we utilize ion implantation to introduce residual compressive stress, affording control over the depth and concentration of implanted ions, with the flexibility to select from a wide range of implantation conditions. This study explores fluorine ion implantation for stress engineering in the subsurface region of a garnet-type SE, Li6.5La3Zr1.5Ta0.5O12 (LLZO), x`a model solid electrolyte material. These implanted ions cause lattice expansion in the near-surface region, inducing residual compressive stress in the implanted region. Additionally, we discovered that ion implantation modifies sub-surface residual stress and alters the electrolyte's surface, resulting in a multifunctional modification. The combined chemical and mechanical effects of ion implantation enable re...