膨胀石墨、石墨烯改善无机盐相变材料热物性能

Improvement of thermal properties of hybrid inorganic salt phase change materials by expanded graphite and graphene

无机盐中、高温相变储能技术对于能源的开发和合理利用具有重要的意义,在太阳能热发电、工业热利用及余热回收方面有着显著优点。采用水溶液法成功制备了性能优异的NaNO3-LiNO3/膨胀石墨、NaNO3-LiNO3/石墨烯复合相变储能材料。利用DSC,MDSC研究了膨胀石墨、石墨烯的添加对NaNO3-LiNO3相变热、峰值温度、导热系数等热物性的影响。结果表明,膨胀石墨、石墨烯的添加使得混合盐的相变热均略有减少,但相变峰值温度分别降低了1.30℃和2.16℃,导热系数分别提高了37.6%和268.8%。

Inorganic salt middle-and-high temperature phase change energy storage technology has great significance for development and appropriate utilization of energy,and has obvious advantages in solar thermal power generation,industrial process heat use,waste heat recovery and so on..High-performance NaNO3-LiNO3（mass ratio is 4.5~5.5）/expanded graphite（EG） and NaNO3-LiNO3/graphene composite phase change materials were successfully prepared by aqueous solution method.Influence of addition of EG and graphene on thermal properties,such as phase change latent heat,peak temperature,and thermal conductivity of NaNO3-LiNO3,were studied by DSC and MDSC.Results showed that the adding of EG and graphene to NaNO3-LiNO3 decreased the mixed inorganic salt′s latent heat slightly,but reduced peak temperature of phase change by 1.30 ℃ and 2.16 ℃,and increased thermal conductivity by 37.6% and 268.8% respectively.