Kaboli Shirin, Noel Pierre, Clément Daniel, Demers Hendrix, Paolella Andrea, Bouchard Patrick, Trudeau Michel L, Goodenough John B, Zaghib Karim
Hydro-Québec's Center of Excellence in Transportation Electrification and Energy Storage, Varennes, QC J3X 1S1, Canada.
Hydro-Québec's Center of Excellence in Transportation Electrification and Energy Storage, Shawinigan, QC G9N 7N5, Canada.
Sci Adv. 2020 Dec 9;6(50). doi: 10.1126/sciadv.abd5708. Print 2020 Dec.
Li-10 wt % Mg alloy (Li-10 Mg) is used as an anode material for a solid-state battery with excellent electrochemical performance and no evidence of dendrite formation during cycling. Thermal treatment of Li metal during manufacturing improves the interfacial contact between a Li metal electrode and solid electrolyte to achieve an all solid-state battery with increased performance. To understand the properties of the alloy passivation layer, this paper presents the first direct observation of its evolution at elevated temperatures (up to 325°C) by in situ scanning electron microscopy. We found that the morphology of the surface passivation layer was unchanged above the alloy melting point, while the bulk of the material below the surface was melted at the expected melting point, as confirmed by in situ electron backscatter diffraction. In situ heat treatment of Li-based materials could be a key method to improve battery performance.
锂含量为10 wt%的镁合金（Li-10 Mg）被用作固态电池的负极材料，具有优异的电化学性能，且在循环过程中没有枝晶形成的迹象。制造过程中对锂金属进行热处理可改善锂金属电极与固体电解质之间的界面接触，从而实现性能提升的全固态电池。为了解合金钝化层的特性，本文首次通过原位扫描电子显微镜对其在高温（高达325°C）下的演变进行了直接观察。我们发现，表面钝化层的形态在合金熔点以上保持不变，而表面以下的大部分材料在预期熔点处熔化，原位电子背散射衍射证实了这一点。对锂基材料进行原位热处理可能是提高电池性能的关键方法。
