离子键合
纳米晶材料
锂(药物)
化学
材料科学
差示扫描量热法
价(化学)
电导率
热重分析
离子电导率
阴极
相(物质)
分析化学(期刊)
无机化学
离子
物理化学
电解质
纳米技术
热力学
有机化学
电极
内分泌学
物理
色谱法
医学
作者
Jian Gao,Siqi Shi,Ruijuan Xiao,Hong Li
标识
DOI:10.1016/j.ssi.2015.12.028
摘要
The pure phase α-LiAlO2 is synthesized by a solid-state reaction. The obtained product has nanocrystalline structure with the Li deficient regions near the surfaces. Combining X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry (TG-DSC), the synthesis mechanism is revealed. The measured room-temperature ionic conductivity of the α-LiAlO2 ceramic pellet is as low as 10− 21 S·cm− 1. This could be caused by the absence of conduction pathways, as calculated from the bond-valence (BV) method. In addition, a first-principles calculation is performed. The calculated result suggests that although the α-LiAlO2 bulk has the extremely low ionic conductivity, its ionic conductivity could be increased significantly when applied the bias voltage, which is due to the introduction of external lithium sources (lithium reservoirs of interstitials/vacancies) and external charge sources (electrons/holes). This may explain why α-LiAlO2 as the coating layer on cathode for Li-ion batteries does not block the transport of lithium ions.
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