TY - JOUR
T1 - LiBH4-NaX (X=Cl, I) composites with enhanced lithium ionic conductivity
AU - Xiang, Mengyuan
AU - Zhang, Yao
AU - Lin, Huaijun
AU - Zhu, Yunfeng
AU - Guo, Xinli
AU - Chen, Jian
AU - Li, Liquan
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/10/5
Y1 - 2018/10/5
N2 - In the present study, ball-milled LiBH4-NaX (X = Cl, I) composites were investigated as fast ionic conductors, in which both halide solid solution LiBH4-xClx and eutectic composite LiBH4-NaBH4 coexist and facilitate the ionic transportation jointly within the system. Measurements by differential scanning calorimetry (DSC) observed that both transition enthalpies and transition temperatures were all reduced, implying that the high temperature phase of LiBH4 was stabilized. LiBH4-NaX (X = Cl, I) composites deliver a conductivity value of 10−2 S cm−1 when temperature is higher than 373 K. At the same time, these values are almost 100 times higher than that of pristine LiBH4 at a temperature below 373 K. A window voltage of 3 V was identified by means of the cyclic voltammetry (CV) measurements on LiBH4-NaX (X = Cl, I) composites for 4 cycles. Furthermore, the structural stability of LiBH4-NaX (X = Cl, I) composites during the ramping process from room temperature to 393 K were demonstrated by in-situ X-ray diffraction (XRD) as well as Fourier Transform infrared spectroscopy (FTIR). It can be concluded that additional NaX (X = Cl or I) plays important roles in the enhancement of ionic conductivity of LiBH4 due to stabilizing the high-temperature phase of LiBH4.
AB - In the present study, ball-milled LiBH4-NaX (X = Cl, I) composites were investigated as fast ionic conductors, in which both halide solid solution LiBH4-xClx and eutectic composite LiBH4-NaBH4 coexist and facilitate the ionic transportation jointly within the system. Measurements by differential scanning calorimetry (DSC) observed that both transition enthalpies and transition temperatures were all reduced, implying that the high temperature phase of LiBH4 was stabilized. LiBH4-NaX (X = Cl, I) composites deliver a conductivity value of 10−2 S cm−1 when temperature is higher than 373 K. At the same time, these values are almost 100 times higher than that of pristine LiBH4 at a temperature below 373 K. A window voltage of 3 V was identified by means of the cyclic voltammetry (CV) measurements on LiBH4-NaX (X = Cl, I) composites for 4 cycles. Furthermore, the structural stability of LiBH4-NaX (X = Cl, I) composites during the ramping process from room temperature to 393 K were demonstrated by in-situ X-ray diffraction (XRD) as well as Fourier Transform infrared spectroscopy (FTIR). It can be concluded that additional NaX (X = Cl or I) plays important roles in the enhancement of ionic conductivity of LiBH4 due to stabilizing the high-temperature phase of LiBH4.
KW - Chemical stability
KW - Electrochemical stability
KW - Ionic conductivity
KW - LiBH-NaX composite
UR - http://www.scopus.com/inward/record.url?scp=85048291620&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2018.06.091
DO - 10.1016/j.jallcom.2018.06.091
M3 - 文章
AN - SCOPUS:85048291620
SN - 0925-8388
VL - 764
SP - 307
EP - 313
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -