本文通过在锂负极中熔入少量铝制备了一种含Al-Li合金（Al₄Li₉）的新型复合锂负极,可有效改善Garnet/金属锂界面润湿性,从而显著降低了界面阻抗. XRD研究结果表明这一复合锂负极由Al₄Li₉合金和金属锂两相复合而成. SEM研究表明,复合锂负极可以有效改善金属锂与Garnet电解质的界面接触,形成更为紧密的接触界面. 电化学测试表明,复合锂负极显著降低了金属锂与Garnet电解质的界面阻抗,界面阻抗由锂/Garnet电解质界面的740.6 Ω·cm ²降低到复合锂负极/Garnet电解质界面的75.0 Ω·cm ². 使用复合锂负极制备的对称电池在50 μA·cm ^-2和100 μA·cm ^-2电流密度锂沉积-溶出过程中表现出较低的极化和良好的循环稳定性,在50 μA·cm ^-2电流密度下,可以稳定循环超过400小时.

Garnet-type solid electrolyte is a newly developed Li ion conductor and promising in the application of all-solid-state batteries. However, Garnet is incompatible with Li anode, which restricts the application of Garnet-type solid batteries. In order to improve the contact between Garnet-type solid electrolyte and Li electrode, a composite anode which contains Al-Li alloy (Al₄Li₉) was prepared as an electrode. Al-Li alloy has many advantages such as easy preparation, low cost, simple post-treatment and high capacity. Garnet-type Li_6.5La₃Zr_1.75W_0.25O₁₂ (LLZWO) was synthesized via solid-state reaction. Garnet solid electrolyte has poor interfacial wettability with lithium, but has good interfacial wettability with Al-Li alloy. By using Al-Li alloy as an electrode, the contact between LLZWO and Li electrodes could be well improved. SEM images also confirmed that Al-Li alloy and Garnet had a sufficient interface contact. On the other side, the interface resistance could be dramatically reduced. Impedance spectra show that the interface resistance between Al-Li alloy and Garnet reduced from 740.6 Ω·cm ² to 75.0 Ω·cm ², which is only one-tenth of interface resistance between Li alloy and Garnet. Symmetric cell with Al-Li alloy and Garnet showed excellent and stable cycle performance with almost 0 polarization voltage when cycling at a current density between 50 μA·cm ^-2 and 100 μA·cm ^-2. At a current density of 50 μA·cm ^-2, the cell cycled 400 hours stably without formation of lithium dendrite.