论文标题
LI3PS4在不同的有机溶剂中的溶解和重结晶行为
Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents
论文作者
论文摘要
固态电池可以基于硫代磷酸电解质（例如β-LI3PS4）构建。为了制备这些电解质，已经报道了各种基于溶剂的路线。为了基于这种硫代磷酸盐的寿命终止固态电池，我们考虑了恢复模型复合beta-li3ps4的溶解和重结晶策略的发展。我们表明，重结晶只能在诸如N-甲基甲酰胺（NMF）之类的极性，略微质量的溶剂中进行。重结晶经过了全面研究，表明它通过具有组成LI3PS4*2NMF的中间相进行，这在结构上表征了。该阶段对锂离子的运输具有很高的电阻率，必须去除以获得类似于原始材料的电导率的重结晶产品。此外，从溶液中重结晶会导致小betaβ-LI3PS4旁边的无定形相位分数增加，这导致活化能降低至0.2 eV，而原始相对于0.38 eV。
Solid state batteries can be built based on thiophosphate electrolytes such as beta-Li3PS4. For the preparation of these electrolytes, various solvent-based routes have been reported. For recycling of end-of-life solid state batteries based on such thiophosphates, we consider the development of dissolution and recrystallization strategies for the recovery of the model compound beta-Li3PS4. We show that recrystallization can only be performed in polar, slightly protic solvents such as N-methylformamide (NMF). The recrystallization is comprehensively studied, showing that it proceeds via an intermediate phase with composition Li3PS4*2NMF, which is structurally characterized. This phase has a high resistivity for the transport of lithium ions and must be removed in order to obtain a recrystallized product with a conductivity similar to the pristine material. Moreover, the recrystallization from solution results in an increase of the amorphous phase fraction next to crystalline beta-Li3PS4, which results in a decrease of the activation energy to 0.2 eV compared to 0.38 eV for the pristine phase.
