Interface-Engineered BN/MXene Composites for Anisotropic Thermal Conduction and Solid-Solid PCM Buffering

doi:10.1002/adfm.75807

Interface-Engineered BN/MXene Composites for Anisotropic Thermal Conduction and Solid-Solid PCM Buffering

2026-05-14

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DOI：10.1002/adfm.75807

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The rational design of phase-change composites that simultaneously deliver high thermal conductivity, intrinsic electrical insulation, and structural integrity is crucial for advanced thermal management and energy-regulation technologies. Herein, we report an interface-engineered anisotropic hybrid aerogel composed of amine-functionalized boron nitride (f-BN) and Ti3C2Tx MXene, fabricated via a dual-polymer-assisted gelation strategy combined with directional freeze-casting. By engineering chemically bonded yet electrically insulating interfaces through B-N-NH2 bridges, Ti-O-C/N linkages, and π–π interactions, the system establishes a phonon-dominated transport network that overcomes the intrinsic trade-off between thermal conduction and electrical insulation. The aligned lamellar architecture further promotes efficient through-plane heat transport. Upon incorporation into a polyurethane-based solid-solid phase-change matrix, the composite achieves a high thermal conductivity of 3.376 W m−1 K−1 at a low filler loading of 14 wt.%, while retaining a substantial latent heat of 108 J g−1 and high electrical resistivity (1.68 × 1012 Ω·cm). The composite exhibits excellent cycling stability (>96% retention after 100 thermal cycles) and delivers significant temperature reductions in CPUs (10.0°C) and Li-ion battery modules (≈7.6°C). This work establishes a design paradigm for electrically insulating, high-performance phase-change composites with synergistic heat transport and energy buffering.

Keywords:

directional freeze casting

hexagonal boron nitride (h-BN)

MXene

solid-solid phase-change materials

thermal energy storage

thermal interface materials (TIMS)

Interface-Engineered BN/MXene Composites for Anisotropic Thermal Conduction and Solid-Solid PCM Buffering

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