Phase change materials (PCMs), renowned for their superior heat storage capabilities, face the challenge of inherently low thermal conductivity (k). This review comprehensively examines strategies to enhance PCM k and thermal energy storage density across four fronts: single component optimization, composites with varied composition ratios, advanced processing technologies, and doping with small molecules. Notably, including 10% expanded graphite in paraffin has been shown to enhance thermal conductivity by over ten times that of pure paraffin. The integration of PCM cooling with air and liqui...
