Composite Materials for Solid-State Batteries and High-Performance Supercapacitors

Dear Colleagues,

The relentless pursuit of safer, more efficient and higher-performing energy storage systems has positioned electrochemical technologies at the forefront of scientific innovation. Among these, solid-state batteries (SSBs) and high-performance supercapacitors (HPSCs) represent two transformative pathways, each addressing critical demands across electric mobility, portable electronics, grid stabilization and beyond. This Special Issue, Frontiers in Composite Materials for Solid-State Batteries and High-Performance Supercapacitors, highlights the pivotal role of composite materials in bridging the gaps between fundamental material properties and practical device performance.

SSBs offer a paradigm shift by replacing flammable liquid electrolytes with solid alternatives, enabling the safe utilization of lithium metal anodes and unlocking superior energy densities. However, the widespread adoption of SSBs is contingent on overcoming persistent challenges, particularly at interfaces, where solid–solid contacts often exhibit high impedance, mechanical instability and dendrite propagation. Composite materials—ranging from polymer–ceramic hybrid electrolytes to structurally reinforced electrodes—have emerged as a powerful strategy to address these limitations. By synergistically combining the flexibility of polymers with the ionic conductivity and mechanical robustness of ceramics, composite electrolytes offer a pathway toward scalable, manufacturable and high-performance solid-state systems.

In parallel, high-performance supercapacitors continue to push the boundaries of power delivery and cycle stability, serving as essential complements to batteries in applications requiring rapid charge/discharge capabilities. The integration of composite architectures in supercapacitors—combining carbonaceous materials with metal oxides, conducting polymers or two-dimensional nanomaterials—has enabled significant enhancements in specific capacitance, rate capability and operational voltage windows. These advances are driving the development of next-generation hybrid devices that blur the traditional lines between batteries and capacitors, aiming to deliver both high energy and high power within unified platforms.

This Special Issue invites contributions that explore the design, synthesis, characterization and application of composite materials across the spectrum of SSBs and high-performance supercapacitors. Topics of interest include advanced composite electrolytes, hierarchical electrode architectures, interfacial engineering, in situ characterization techniques, theoretical modeling and scalable manufacturing approaches. By bringing together cutting-edge research at the intersection of composite materials and electrochemical energy storage, this collection aims to accelerate the translation of laboratory innovations into commercially viable technologies, ultimately contributing to a more sustainable and electrified future.

Dr. Muhammad Sajjad
Guest Editor

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