Sulfide solid-state electrolytes (SEs), prized for high ionic conductivity and mechanical strength, face practical challenges due to multi-field coupling failures under operational stresses. While prior studies emphasize electrochemical degradation (e.g., interfacial reactions, Li dendrites), thermal failure mechanisms during high-temperature storage remain overlooked. This work systematically explores calendar aging in sulfide-based all-solid-state batteries (ASSBs). Among tested systems, LiCoO₂ (LCO), Li 6 PS 5 Cl, and Li-In alloy exhibit superior stability after high-temperature storage. However, high-voltage LiNi 0.8 Co 0.1 Mn 0.1 O₂ (NCM811) undergoes structural collapse, releasing decomposition products that accelerate interfacial reactions and thermal failure. Batteries at high states of charge (SOC) experience intensified self-discharge-driven electrode-electrolyte reactions at elevated temperatures. In contrast, LCO-Li 6 PS 5 Cl-LiIn ASSBs at 0 SOC retain nearly undegraded performance after 5 days at 90°C. Suppressing the detrimental H3-phase transition in NCM811 improves capacity retention by ≥21%. The study elucidates high-temperature degradation pathways in sulfide ASSBs, linking thermo-electro-chemical coupling effects to interfacial ion transport barriers and contact degradation. These insights advance the understanding of calendar aging mechanisms, providing critical guidance for predicting battery lifespan and designing robust electrode/electrolyte systems.
The sharp reduction in size and increase in power density of next-generation integrated circuits lead to electromagnetic interference and heat failure being a key roadblock for their widespread applications in polymer-based electronic packaging materials. This work demonstrates a multifunctional epoxy-based composite (MDCF@LDH/EP) with high electromagnetic wave (EMW) absorption, thermal conductivity, and flame retardancy performance. In which, the synergistic effect of porous structure and heterointerface promotes the multiple reflection and absorption, and dielectric loss of EMW. A low reflection loss of −57.77 dB, and an effective absorption bandwidth of 7.20 GHz are achieved under the fillings of only 10 wt%. Meanwhile, a 241.4% enhanced thermal conductivity of EP is due to the high continuous 3D melamine-derived carbon foams (MDCF), which provides a broad path for the transport of phonons. In addition, MDCF@LDH/EP composite exhibits high thermal stability and flame retardancy, thanks to the physical barrier effect of MDCF@LDH combined with the high temperature cooling properties of NiAl-LDH-CO 3 2− . Compared with pure epoxy resin, the peak heat release rate and the total heat release rate are reduced by 19.4% and 30.7%, respectively. Such an excellent comprehensive performance enables MDCF@LDH/EP to a promising electronic packaging material.
危险品化学品经营许可证（带存储）