Fabricating high-conductive composites and constructing highly conductive networks are crucial for high-performance electrothermal film. In this study, an Ag nanowires/graphene (Ag/G) composite synthesized by liquid-phase exfoliation and in-situ photoreduction is mixed with carbon black (CB) to form a composite conductive ink, and a CB/Ag/G composite electrothermal film with a point-line-plane three-dimensional microstructure is obtained via blade coating process. Both the addition of Ag nanowires and a subsequent compression rolling treatment induce the establishment of the effective conductive network in the film, endowing it with an outstanding conductivity of 399.4 S cm⁻¹. The film reaches a T_s of 204 °C with an input voltage of 3.0 V, and is successfully applied in water heating and de-icing, demonstrating its extraordinary electrothermal performance and vast potential for practical applications. The film is also used as an electromagnetic shielding film and heat dissipation substrate, showing exceptional electromagnetic shielding (42.5 dB) and heat dissipation properties.

制造高导电复合材料和构建高导电网络对于高性能电热膜至关重要。本研究通过液相剥离和原位光还原合成的银纳米线/石墨烯（Ag/G）复合材料与炭黑（CB）混合形成复合导电油墨，并制备了CB/Ag/G复合材料电热通过刮刀涂布工艺获得具有点线面三维微结构的薄膜。 Ag纳米线的添加和随后的压延处理均导致薄膜中有效导电网络的建立，使其具有399.4 S cm ^-1的出色电导率。该薄膜在3.0 V输入电压下的Ts达到204 °C，并成功应用于水加热和除冰，展示了其非凡的电热性能和巨大的_实际应用潜力。该薄膜还用作电磁屏蔽膜和散热基材，表现出优异的电磁屏蔽（42.5 dB）和散热性能。