Effect of Sn substitution for Co on microstructure and electrochemical performance of ABsub(5) type Lasub(0.7)Mgsub(0.3)Mnsub(0.4)Cosub(0.5)-sub(x)Snsub(3.8)(x=0-0.5) alloys
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Transactions of Nonferrous Metals Society of China
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: The effects of substitution of Sn for Co on the microstructure, hydrogen storage and electrochemical discharge capacity of
La0.7Mg0.3Al0.3Mn0.4Co0.5−xSnxNi3.8 (x=0, 0.1, 0.2, 0.3 and 0.5) alloys were investigated using X-ray diffraction (XRD), pressure
composition isotherm (PCT) and electrochemical discharge cycle. XRD, scanning electron microscopy (SEM) and energy dispersive
spectroscopy (EDS) tests showed that all of alloys are mainly composed of LaNi5 and MgNi2 phases, but when increasing the content
of Sn in alloys, the LaNiSn phase appears and microstructure is refined. The PCT showed that increasing substitution of Sn for Co
results in decrease of the maximum hydrogen storage capacity from 1.48% (x=0) to 0.85% (x=0.5). The electrochemical tests
indicated that the maximum discharge capacity decreases from 337.1 mA·h/g (x=0) to 239.8 mA·h/g (x=0.5); however, the discharge
capacity retention at the 100th cycle increases from 70.2% (x=0) to 78.0% (x=0.5).
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CASINI, JULIO C.S.; GUO, ZAIPING; LIU, HUA K.; FERREIRA, ELINER A.; FARIA, RUBENS N.; TAKIISHI, HIDETOSHI. Effect of Sn substitution for Co on microstructure and electrochemical performance of ABsub(5) type Lasub(0.7)Mgsub(0.3)Mnsub(0.4)Cosub(0.5)-sub(x)Snsub(3.8)(x=0-0.5) alloys. Transactions of Nonferrous Metals Society of China, v. 25, n. 2, p. 520-526, 2015. DOI: 10.1016/S1003-6326(15)63633-0. Disponível em: http://repositorio.ipen.br/handle/123456789/23794. Acesso em: 30 Dec 2025.
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