Solar salt (SS) is an energy storage material widely used in concentrating solar power (CSP) stations at industrial thermal energy storage (TES) systems in the current. Hence, a conventional high-temperature static melting method was used to prepare nano hexagonal boron nitride-SS (h-BN-SS, BS system) composite materials with different content of nano BN to improve the heat storage and transfer performance of SS. The specific heat (c_p) of 1.81 J·g⁻¹·K⁻¹ was obtained at nano BN content of 0.8 wt% (sample BS6), which had increase of 16.03% compared with pure SS (sample BS0). The crystal planes (104) and (221) of nitrate appeared on the surface of nano BN (100), promoted the enhancement of surface energy of whole system. The using temperature zone was widened and thermal conductivity (λ) had been increased by 18.52%. The existence forms of nano BN hadn't changed at high temperature, and the cation environment around NO₃⁻ of BS0 and BS6 were changed after adding nano BN demonstrated by high temperature Raman spectroscopy. Moreover, BS6 had excellent thermal stability at long-term thermal stability measurement within 7200 min. The observations suggested that nano BN may serve as promising additive for solar energy storage material toward TES system applications.

太阳盐（SS）是一种储能材料，目前广泛用于工业热能储存（TES）系统的聚光太阳能（CSP）站。因此，采用常规的高温静态熔融法制备了不同纳米BN含量的纳米六方氮化硼-SS（h-BN-SS，BS系）复合材料，以提高SS的储热和传热性能。比热 ( _cp ) 为 1.81 J·g ^-1 ·K ^-1在纳米 BN 含量为 0.8 wt%（样品 BS6）时获得，与纯 SS（样品 BS0）相比增加了 16.03%。纳米BN（100）表面出现硝酸盐的（104）和（221）晶面，促进了整个体系表面能的提高。使用温区拓宽，导热系数（λ）提高了18.52%。纳米BN的存在形式在高温下没有变化，NO ₃周围的阳离子环境^-通过高温拉曼光谱证明，加入纳米BN后，BS0和BS6的含量发生了变化。此外，BS6 在 7200 分钟内的长期热稳定性测量中具有出色的热稳定性。观察结果表明，纳米 BN 可以作为太阳能存储材料的有前途的添加剂，用于 TES 系统应用。