Yan Yigang, Grinderslev Jakob B, Burankova Tatsiana, Wei Shanghai, Embs Jan P, Skibsted Jørgen, Jensen Torben R
Institute of New Energy and Low-Carbon Technology, Sichuan University, 610207 Chengdu, China.
Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, 8000 Aarhus, Denmark.
J Phys Chem Lett. 2022 Mar 10;13(9):2211-2216. doi: 10.1021/acs.jpclett.2c00136. Epub 2022 Mar 2.
Design of new functional materials with fast Mg-ion mobility is crucial for the development of competitive solid-state magnesium batteries. Herein, we present new nanocomposites, Mg(BH)·1.6NH-AlO, reaching a high magnesium conductivity of σ(Mg) = 2.5 × 10 S cm at 22 °C assigned to favorable interfaces between amorphous state Mg(BH)·1.6NH; inert and insulating AlO nanoparticles; and a minor fraction of crystalline material, mainly Mg(BH)·2NH. Furthermore, quasi-elastic neutron scattering reveals that the Mg-ion mobility in the solid state appears to be correlated to relatively slow motion of NH molecules rather than the fast dynamics of BH complexes. The nanocomposite is compatible with a metallic Mg anode and shows stable Mg stripping/plating in a symmetric cell and an electrochemical stability of ∼1.2 V. The nanocomposite has high mechanical stability and ductility and is a promising Mg electrolyte for future solid-state magnesium batteries.
设计具有快速镁离子迁移率的新型功能材料对于开发具有竞争力的固态镁电池至关重要。在此，我们展示了新型纳米复合材料Mg(BH)·1.6NH - AlO，在22°C时达到了σ(Mg) = 2.5×10 S cm的高镁电导率，这归因于非晶态Mg(BH)·1.6NH、惰性绝缘的AlO纳米颗粒以及少量主要为Mg(BH)·2NH的晶体材料之间的良好界面。此外，准弹性中子散射表明，固态中的镁离子迁移率似乎与NH分子的相对缓慢运动相关，而非BH络合物的快速动力学。该纳米复合材料与金属镁阳极兼容，在对称电池中表现出稳定的镁剥离/镀覆，并且具有约1.2 V的电化学稳定性。该纳米复合材料具有高机械稳定性和延展性，是未来固态镁电池有前景的镁电解质。
