Molding of Li₅. ₅PS₄. ₅Cl₁. ₅ Particles Based on Regulating Li^+ Transport for All‐Solid‐State Li Metal Battery

All-solid-state Li metal batteries (ASSLBs) are coming with sulfide solid-state electrolytes (S-SSEs) for superior Li^+ conductivity, but irregular particles and interfaces lead to disorder Li+ flux in S-SSEs that hinder pure Li as an anode. Specially, its mesoscopic structure cannot be adequately described by average size, making it difficult to analyze Li^+ flux effectively. Herein, a model is constructed on the molding of Li₅. ₅PS₄. ₅Cl₁. ₅ (LPSC) particles and defined size as the number (N) and consistency (σ) to evaluate their effects on Li^+ transfer and concentration uniformity. Through machine learning of calculation data (Li+ concentration with N and σ) and experimental results, excessive interfaces can hinder Li^+ transport and local aggregation of irregular interfaces leads to uneven ion transport. Therefore, a particle size gradient S-SSEs (induced by different size LPSC particles) is predicted to achieve fast and uniform Li^+ transport. Subsequently, this designed S-SSE is applied in ASSLBs, which can complete a 1000 h cycle with capacity retention exceeding 80%. This study elucidates that the long cycle ASSLBs can be achieved by adjusting the molding of LPSC particles. Specifically, it demonstrates that the Li^+ flux of the whole S-SSEs can be optimized through gradient size design.