The effect of mechanical milling on the lithium-ion conductivity of lithium alanate (LiAlH₄) is investigated. Although pristine LiAlH₄ is a poor ion conductor in its highly crystalline state, short-time mechanical milling for 0.1–2 h is shown to significantly improve the conductivity. Hand-milling treatment in an argon-filled glove box is also shown to improve the conductivity. The activation energy (E_a) for ion conduction of milled LiAlH₄ is ~0.70 eV, which is attributed to Li-ion site vacancy-mediated conduction. However, the E_a of pristine LiAlH₄ shows a large value of 0.84 eV. The ⁷Li, ⁶Li, ²⁷Al nuclear magnetic resonance and infrared spectra suggest that surface Li hydroxide species would exhibit Li-ion conduction in pristine LiAlH₄. Thus, the milling treatment can eliminate the effect of surface hydroxide species and increase the vacancy concentration at the Li-ion site of inner LiAlH₄ grains, which results in the enhancement of the conductivity.

研究了机械研磨对铝酸锂（LiAlH ₄）的锂离子电导率的影响。尽管原始的LiAlH ₄在其高度结晶状态下是一种不良的离子导体，但短时间的机械研磨0.1–2 h可显着提高电导率。还显示了在充满氩气的手套箱中进行手磨处理可以提高电导率。研磨后的LiAlH _4的离子传导的活化能（E _a）为〜0.70 eV，这归因于Li离子位点空位介导的传导。然而，原始LiAlH ₄的E _a显示为0.84eV的大值。在⁷李，⁶力，²⁷ Al核磁共振和红外光谱表明，表面氢氧化锂会在原始LiAlH _4中表现出锂离子传导。因此，研磨处理可以消除表面氢氧化物种类的影响并增加内部LiAlH ₄晶粒的Li离子位点处的空位浓度，这导致电导率的提高。