石榴石型固态电解质/铝锂合金界面构筑及电化学性能

Construction and Electrochemical Performance of Garnet-Type Solid Electrolyte/Al-Li Alloy Interface

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740.6Ω·cm^2降低到复合锂负极/Garnet电解质界面的75.0Ω·cm^2.使用复合锂负极制备的对称电池在50μA·cm^-2和100μA·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50μA·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 Li6.5La3Zr1.75W0.25O12(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 740.6Ω·cm^2 to 75.0Ω·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 50μA·cm^-2 and 100μA·cm^-2.At a current density of 50μA·cm^-2,the cell cycled 400 hours stably without formation of lithium dendrite.