机械振动对动力汽车电池用钒基储氢合金组织与性能的影响

Influence of Mechanical Vibration on Microstructure and Properties of V-based Hydrogen Storage Alloy for Electric Vehicles Power Battery

采用机械振动辅助浇注法制备了钒基储氢合金,并进行了显微组织的观察、物相组成的分析、耐腐蚀性能和循环稳定性的测试与分析。结果表明,机械振动辅助浇注,有利于消除铸态钒基储氢合金的夹杂物,获得高质量的铸态合金,显著提高合金的耐腐蚀性能和循环稳定性。与未进行机械振动相比,采用机械振动辅助浇注获得的钒基储氢合金腐蚀电位正移245 mV,循环20次后放电容量衰竭从98.99%减小至25.06%。

V-based hydrogen storage alloys were prepared by mechanical vibration assisted pouring method, and the microstructure observation, phase composition, corrosion properties and cycle stability of the alloy were carried out. The results show that the mechanical vibration assisted pouring is beneficial to eliminate the inclusions of as-cast vanadium base hydrogen storage alloy, then , high-quality as-cast alloy can be obtained, and this method can significantly improve the corrosion resistance and cycle stability of the alloy. Compared with that before the mechanical vibration, the corrosion potential of V-based hydrogen storage alloy using mechanical vibration assisted pouring shifts by 245 mV, and after cycle 20 times, the discharge capacity failure reduces from 98.99% to 25.06%.