Gulino Valerio, Brighi Matteo, Murgia Fabrizio, Ngene Peter, de Jongh Petra, Černý Radovan, Baricco Marcello
Department of Chemistry and Inter-departmental Center Nanostructured Interfaces and Surfaces (NIS), University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy.
Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands.
ACS Appl Energy Mater. 2021 Feb 22;4(2):1228-1236. doi: 10.1021/acsaem.0c02525. Epub 2021 Jan 29.
LiBH has been widely studied as a solid-state electrolyte in Li-ion batteries working at 120 °C due to the low ionic conductivity at room temperature. In this work, by mixing with MgO, the Li-ion conductivity of LiBH has been improved. The optimum composition of the mixture is 53 v/v % of MgO, showing a Li-ion conductivity of 2.86 × 10 S cm at 20 °C. The formation of the composite does not affect the electrochemical stability window, which is similar to that of pure LiBH (about 2.2 V Li/Li). The mixture has been incorporated as the electrolyte in a TiS/Li all-solid-state Li-ion battery. A test at room temperature showed that only five cycles already resulted in cell failure. On the other hand, it was possible to form a stable solid electrolyte interphase by applying several charge/discharge cycles at 60 °C. Afterward, the battery worked at room temperature for up to 30 cycles with a capacity retention of about 80%.
由于室温下离子电导率较低，LiBH作为工作温度为120°C的锂离子电池固态电解质受到了广泛研究。在这项工作中，通过与MgO混合，LiBH的锂离子电导率得到了提高。混合物的最佳组成是53 v/v%的MgO，在20°C时锂离子电导率为2.86×10 S cm。复合材料的形成不影响电化学稳定窗口，这与纯LiBH的电化学稳定窗口相似（约2.2 V Li/Li）。该混合物已被用作TiS/Li全固态锂离子电池的电解质。室温测试表明，仅五个循环就导致电池失效。另一方面，通过在60°C下进行几次充放电循环，可以形成稳定的固体电解质界面。之后，电池在室温下工作了30个循环，容量保持率约为80%。
