Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831 (USA).
Angew Chem Int Ed Engl. 2015 Jan 2;54(1):129-33. doi: 10.1002/anie.201408124. Epub 2014 Oct 21.
Batteries with an aqueous catholyte and a Li metal anode have attracted interest owing to their exceptional energy density and high charge/discharge rate. The long-term operation of such batteries requires that the solid electrolyte separator between the anode and aqueous solutions must be compatible with Li and stable over a wide pH range. Unfortunately, no such compound has yet been reported. In this study, an excellent stability in neutral and strongly basic solutions was observed when using the cubic Li7 La3 Zr2 O12 garnet as a Li-stable solid electrolyte. The material underwent a Li(+) /H(+) exchange in aqueous solutions. Nevertheless, its structure remained unchanged even under a high exchange rate of 63.6 %. When treated with a 2 M LiOH solution, the Li(+) /H(+) exchange was reversed without any structural change. These observations suggest that cubic Li7 La3 Zr2 O12 is a promising candidate for the separator in aqueous lithium batteries.
具有水性电解液和锂金属阳极的电池由于其出色的能量密度和高的充放电率而引起了人们的兴趣。这种电池的长期运行要求阳极和水性溶液之间的固体电解质隔板必须与 Li 兼容，并在很宽的 pH 范围内稳定。遗憾的是，尚未报道具有这种性能的化合物。在这项研究中，立方 Li7 La3 Zr2 O12 石榴石用作 Li 稳定的固体电解质时，在中性和强碱性溶液中表现出优异的稳定性。该材料在水溶液中经历了 Li(+) / H(+) 交换。然而，即使在 63.6%的高交换率下，其结构仍保持不变。用 2 M LiOH 溶液处理时，Li(+) / H(+) 交换被反转而没有任何结构变化。这些观察结果表明，立方 Li7 La3 Zr2 O12 是水性锂离子电池中隔膜的有前途的候选材料。
