Integrating Gel Electrolyte/Anode with Mixed Ionic-Electronic Network for Stable Quasi-Solid-State Lithium Metal Batteries

Interface integration is crucial for achieving rapid lithium-ion transport and conversion under high mass loading and represents a key strategy for constructing high-energy-density quasi-solid-state lithium metal batteries (QSSLMBs). However, Li deposition at the electrode interface during cycling tends to generate significant mechanical stress, leading to interface delamination, increased impedance, and rapid battery failure. Herein, we design a mixed ionic-electronic conductive composite anode by integrating gel electrolyte into a three-dimensional hollow MXene/Li scaffold. This architecture enables dynamic volume accommodation while guiding uniform Li deposition into internal cavities via lithiophilic sites and curved pore geometry, effectively suppressing dendrite growth and interfacial stress. The resulting all-in-one QSSLMBs achieve over 1750 h in symmetric cells and maintain 72.6% capacity after 1000 cycles at 1 C in a LiFePO₄ full cell. When paired with a high loading LiNi0.9Co0.05Mn0.05O₂ cathode (31.5 mg cm⁻²), a single-layer and projected 13-layer pouch cells achieve an energy density of 392 Wh kg⁻¹ and 561 Wh kg⁻¹, demonstrating its potential for durable, high-energy QSSLMBs.