Liao Yu-Kai, Liu Ru-Shi, Hu Shu-Fen
Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.
Department of Chemistry and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 106, Taiwan.
ACS Appl Mater Interfaces. 2023 Sep 20;15(37):44413-44421. doi: 10.1021/acsami.3c06527. Epub 2023 Sep 8.
Next-generation lithium-ion batteries must have high energy density and safety, making the development of all-solid-state batteries imperative. One of the biggest advantages of an all-solid-state lithium-ion battery (ASSLIB) is that its alloy uses lithium metal as an anode while ignoring its flammability and other dangers. Herein, high-conductivity garnet-type LiLaZrTaO (LLZTO) was chosen as the solid electrolyte part of an all-solid-state battery. A composite anode was formed by melting Li and MXene-MAX together, reducing the interface impedance from 566 to 55 Ω cm. The Li-MXene|LLZTO|LFP full battery displayed a high initial discharge capacity of 163.0 mAh g and a Coulombic efficiency of 97.0% and maintained 90.2% of its discharge capacity over 100 cycles, but it did not maintain a good overpotential. Therefore, the synergistic effect of Li-MXene-Pt will highly improve the performance of the full battery because of its high initial discharge capacity of 150.0 mAh g and Coulombic efficiency of 95.5%, discharge capacity maintained at 93.3% over 100 cycles, and low overpotential of 0.04 V.
下一代锂离子电池必须具备高能量密度和安全性，这使得全固态电池的研发势在必行。全固态锂离子电池（ASSLIB）最大的优势之一在于其负极使用锂金属合金，却忽略了其易燃性和其他危险。在此，高电导率的石榴石型LiLaZrTaO（LLZTO）被选作全固态电池的固体电解质部分。通过将锂与MXene-MAX熔融在一起形成复合负极，界面阻抗从566 Ω·cm降至55 Ω·cm。Li-MXene|LLZTO|LFP全电池展现出163.0 mAh/g的高初始放电容量和97.0%的库仑效率，并且在100次循环后仍保持其放电容量的90.2%，但它没有维持良好的过电位。因此，Li-MXene-Pt的协同效应将极大地提升全电池的性能，因为其初始放电容量为150.0 mAh/g，库仑效率为95.5%，在100次循环后放电容量保持在93.3%，且过电位低至0.04 V。
