LiBH-CaH 复合材料及其热能存储潜力的研究。

Investigation on LiBH-CaH composite and its potential for thermal energy storage.

机构信息

State Key Laboratory for Advanced Metals and Materials, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

Sci Rep. 2017 Jan 31;7:41754. doi: 10.1038/srep41754.

DOI:10.1038/srep41754

PMID:28139740

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5282489/

Abstract

The LiBH/CaH composite are firstly studied as Concentrating Solar Power Thermal Storage Material. The LiBH/CaH composite according to the stoichiometric ratio are synthesized by high-energy ball milling method. The kinetics, thermodynamics and cycling stability of LiBH/CaH composite are investigated by XRD (X-ray diffraction), DSC (Differential scanning calorimeter) and TEM (Transmission electron microscope). The reaction enthalpy of LiBH/CaH composite is almost 60 kJ/mol H and equilibrium pressure is 0.482 MPa at 450 °C. The thermal storage density of LiBH/CaH composite is 3504.6 kJ/kg. XRD results show that the main phase after dehydrogenation is LiH and CaB. The existence of TiCl and NbF can effectively enhance the cycling perfomance of LiBH/CaH composite, with 6-7 wt% hydrogen capacity after 10 cycles. The high thermal storage density, high working temperature and low equilibrium pressure make LiBH/CaH composite a potential thermal storage material.

摘要

LiBH/CaH 复合材料首次被研究作为聚光太阳能热储能材料。LiBH/CaH 复合材料按照化学计量比通过高能球磨法合成。通过 XRD（X 射线衍射）、DSC（差示扫描量热法）和 TEM（透射电子显微镜）研究了 LiBH/CaH 复合材料的动力学、热力学和循环稳定性。LiBH/CaH 复合材料的反应焓约为 60kJ/mol H，在 450°C 时平衡压力为 0.482MPa。LiBH/CaH 复合材料的储热密度为 3504.6kJ/kg。XRD 结果表明，脱氢后的主要相是 LiH 和 CaB。TiCl 和 NbF 的存在可以有效提高 LiBH/CaH 复合材料的循环性能，经过 10 次循环后具有 6-7wt%的储氢容量。高储热密度、高工作温度和低平衡压力使 LiBH/CaH 复合材料成为一种有潜力的热储能材料。