Yongxing Shen

Sulfide solid-state electrolyte films that combine thinness, high ionic conductivity and large-area feasibility are needed to improve energy density and enable industrial-scale production of all-solid-state batteries. However, workable processing methods to integrate these critical features remain technically challenging. Herein, we demonstrate a quasi-dry process utilizing an organic additive (i.e., α-pinene), through which the fabricated sulfide electrolyte films successfully integrate all the aforementioned merits. α-Pinene is chemically compatible with Li_5.5PS_4.5Cl_1.5, improves film flexibility via stress dissipation, enhances ionic conductivity by promoting a more even distribution of the polytetrafluoroethylene binder, and facilitates film densification through lubrication. The resultant films with enhanced densification (porosity reduced from 12.24% to 7.78%) retain over 85% ionic conductivity of the pristine powder, exhibit an ionic conductivity of 4.79 mS/cm at 25 °C, with a thickness of 28 μm and lateral dimensions of 30 × 10 cm². The Li₄Ti₅O₁₂ | Li_5.5PS_4.5Cl_1.5 | LiNbO₃@LiNi_0.8Co_0.1Mn_0.1O₂ full cells present a capacity retention of 93% after 500 cycles at 1 C under 2 MPa. At the stack level, a 50 mAh pouch cell retains 83% capacity after 1000 cycles at 0.5 C under 2 MPa. This work proposes an additive-assisted quasi-dry process, paving a pathway for material-process optimization toward potentially scalable fabrication of all-solid-state batteries.

Laser shock peening is a surface enhancement technique for metallic materials. However, it can induce large deformation or even spallation in thin-walled structures under high-energy impacts. This study develops a large deformation phase field model to investigate this phenomenon. The model incorporates the Mie--Gruneisen equation of state and a hypoelasto-plastic constitutive relation, implemented via a fully explicit integration scheme with adaptive time stepping. The model is verified by energy analysis and validated with experimental results, then applied to investigate the fracture behavior under multiple LSP impacts and determine the maximum attainable deformation and the permissible load of thin-walled specimens prior to spallation.