▎ 摘　　要

As the demand for electric devices continues to rise, there is a growing interest in ensuring the proper functioning of lithium-ion batteries (LIBs) at low temperatures. However, the use of conventional heating pump systems for portable LIB packs can be limited due to high costs and complicated equipment. To address this challenge, we have developed a graphene film on a quartz substrate (GFqtz)-based electric heater using organic nano carbon source (ONCS) technology. This large-scale graphene film on a quartz substrate enables the proper function of portable LIBs at low temperatures (-20 degrees C). The GFqtz-based electric heater (2 cm2) demonstrated excellent electrothermal performance, with an equilibrium temperature of 180 degrees C at 14 V, heating rates over 1.3 degrees C s-1, and power density at 1.645 W cm-2. A LIBs pack was constructed using a thermal insulation space (10 cm3) with a GFqtz-based heater (5 cm2), which demonstrated the capacity of 2000 mAh at a current density of 500 mA h-1 and-20 degrees C, achieved by the 14 V heating voltage. As a result, the feasibility of portable LIBs pack at low temperature has been demonstrated by self-powering for heating. This approach provides an efficient and cost-effective solution for enabling the proper function of the portable LIBs at low temperatures.