化工进展 ›› 2022, Vol. 41 ›› Issue (12): 6302-6309.DOI: 10.16085/j.issn.1000-6613.2022-0274

• 能源加工与技术 • 上一篇    下一篇

采用有机溶剂的热再生电池性能

李洞1,2(), 石雨1,2, 张亮1,2(), 李俊1,2, 付乾1,2, 朱恂1,2, 廖强1,2   

  1. 1.重庆大学低品位能源利用及系统教育部重点实验室,重庆 400030
    2.重庆大学工程热物理研究所,重庆 400030
  • 收稿日期:2022-02-23 修回日期:2022-04-26 出版日期:2022-12-20 发布日期:2022-12-29
  • 通讯作者: 张亮
  • 作者简介:李洞(1998—),男,硕士研究生,研究方向为电化学能源转化。E-mail:20173242@cqu.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(51976018);国家自然科学基金创新研究群体项目(52021004)

Performance of thermal regenerative batteries with organic solvents

LI Dong1,2(), SHI Yu1,2, ZHANG Liang1,2(), LI Jun1,2, FU Qian1,2, ZHU Xun1,2, LIAO Qiang1,2   

  1. 1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China
    2.Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China
  • Received:2022-02-23 Revised:2022-04-26 Online:2022-12-20 Published:2022-12-29
  • Contact: ZHANG Liang

摘要:

基于电化学的热再生电池(thermally regenerative batteries,TRBs)可有效地将低温废热转换为电能,而目前广泛研究的水系TRB存在开路电压(<450mV)、能量密度(<1260Wh/m3)和热效率(<1.0%)均较低的问题,为缓解上述问题,本文利用铜配合物,构建了采用有机溶剂并以乙腈为配体的TRB体系以突破水系TRB开路电压较低的局限,并研究了不同有机溶剂(碳酸丙烯酯、乙二醇和碳酸乙烯酯)、流量、乙腈含量和温度对电池产电性能的影响。结果表明,以乙腈为配体的TRB体系的开路电压均在1.0V左右,碳酸丙烯酯作为溶剂的TRB性能最佳,27℃下最大功率密度为82W/m2,能量密度为3672Wh/m3,热效率达到2.6%;TRB最大功率密度随流速先增加后保持不变,而随乙腈含量先增加后降低;由于化学反应的增强和电解液黏度的降低,在一定范围内电池最大功率密度随温度升高而线性增加。

关键词: 电化学, 热再生电池, 配合物, 溶剂, 热效率, 传质

Abstract:

Electrochemistry based thermal regenerative batteries (TRBs) can effectively convert low-grade waste heat into electric energy. However, there are still some limitations such as low open circuit voltage (<450mV), low energy density (<1260Wh/m3) and low thermal efficiency (<1.0%) for aqueous TRBs. Thus, the TRB system with organic solvent and acetonitrile as ligand was constructed by using copper complex to break through the limitation of low open circuit voltage of aqueous TRB. The effects of different organic solvents (propylene carbonate, ethylene glycol and ethylene carbonate), flow rate, acetonitrile content and operating temperature on the TRBs performance are investigated. The results showed that the open circuit voltage of the TRB system with acetonitrile as ligand was around 1.0V and the highest power density of 82W/m2 with an energy density of 3672Wh/m3 and a thermal efficiency of 2.6% was obtained in the TRB using propylene carbonate solvent electrolyte at 27℃. The maximum power density firstly increased with flow rate and afterwards kept approximately unchanged. The acetonitrile content had a significant effect on the open circuit voltage and the maximum power density of the battery, and the peak value was obtained at acetonitrile volume fraction of 75%. In addition, due to the enhancement of chemical reaction and the decrease of electrolyte viscosity, the maximum power density linearly increased with the increase of operating temperature in a certain range.

Key words: electrochemistry, thermal regenerative battery, complexes, solvents, thermal efficiency, mass transfer

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