Weldable graphene foams for wide-range thermal switches

作者：Shiya Cao, Huaqiang Fu, Pengfei Chen, Hao Feng, Ziran Zhang, Ziqi Lin, Zhe Wang, Wei Qian, Chao Tian, Lun Li, Daping He · 发表于：Cell Reports Physical Science · 年份：2025 · DOI：10.1016/j.xcrp.2025.102599 · 被引用次数：5 · 研究领域：Thermal properties of materials、Graphene research and applications、Thermal Radiation and Cooling Technologies

Dynamic thermal regulation has become the pivotal issue for future electronics thermal management. Porous elastic materials have been widely developed as smart thermal switches, exhibiting compression-induced tunable heat transfer behavior. However, such tunability is severely restricted by the limited out-of-plane macroscale. Herein, we report a multilayer welding strategy for fabricating graphene foam (GF) thermal switches with wide tuning ranges (TRs) and high switch ratios (SRs). Infinitely expanding the out-of-plane size is realized by constructing a reliable welding interface, leveraging the capillary force and hydrogen bonding within graphene oxide foam. After graphitization, the obtained multilayer GFs (M-GFs) demonstrate excellent elasticity and wide thermal resistance TRs. Specifically, the 7-layer GFs demonstrate an ultra-wide TR of thermal resistance (15.49–604.85 cm 2 K W −1 ) and a much-improved SR (39.0) within the elastic range. When applied to lithium-ion battery thermal management, M-GFs ensure safe temperature and maintain discharge capacity, showing great potential in dynamic thermal management.