Surface mount technology-compatible ultra-compact multi-layer composite battery

초록

The rapid evolution of ultra-miniaturized electronics demands compact energy storage solutions compatible with surface mount technology (SMT). However, conventional components such as multi-layer ceramic capacitors (MLCCs) fall short in energy density and long-term power delivery. Here, we introduce solid-state-based multi-layer composite batteries (MLCBs) that achieve high energy/power densities and full SMT integration. To address the limitations of existing energy storage systems, key material and structural innovations were integrated into all components of the MLCB. Specifically, a polymer-based mixed ionic-electronic conducting (MIEC) coating was applied to NCM and LTO active materials, enabling high-loading electrodes with enhanced interfacial stability. In parallel, we developed a PVDF-HFP-based hybrid polymer electrolyte reinforced with ceramic fillers and a LiOH & sdot;H2O additive. This combination promoted the formation of a stable pre-SEI via a controlled Li+ coordination environment. Based on these design strategies, the resulting prototype MLCB with 10-unit cells demonstrates an areal energy density of 34.6 mWh cm-2 and a power density of 89.3 mW cm-2, with excellent cycling retention (89.5% over 200 cycles, at 0.2C-rate). Taken together, this work presents a brand-new SMTcompatible energy device, demonstrating the practical application and high potential of MLCBs for next-generation electronics.

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