Mayer Alexander, Ates Tugce, Varzi Alberto, Passerini Stefano, Bresser Dominic
Helmholtz Institute Ulm (HIU), Ulm, Germany.
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
Front Chem. 2022 Aug 23;10:974202. doi: 10.3389/fchem.2022.974202. eCollection 2022.
Solid-state lithium batteries are considered one of the most promising candidates for future electrochemical energy storage. However, both inorganic solid electrolytes (such as oxide-based or sulfide-based materials) and polymer electrolytes still have to overcome several challenges to replace the currently used liquid organic electrolytes. An increasingly adopted approach to overcome these challenges relies on the combination of different electrolyte systems. Herein, we report the synthesis and characterization of a novel sulfur-doped single-ion conducting multi-block copolymer (SIC-BCE) system. This SIC-BCE may serve as interlayer between the electrodes and the sulfidic electrolyte such as LiPSCl, thus benefitting of the high ionic conductivity of the latter and the favorable interfacial contact and electrochemical stability of the polymer. The polymer shows excellent ionic conductivity when swollen with ethylene carbonate and allows for stable stripping/plating of lithium, accompanied by a suitable electrochemical stability towards reduction and oxidation. First tests in symmetric Cu|SIC-BCE|LiPSCl|SIC-BCE|Cu cells confirm the general suitability of the polymer to stabilize the electrode|electrolyte interface by preventing the direct contact of the sulfidic electrolyte with, e.g., metallic copper foils.
固态锂电池被认为是未来电化学储能最有前景的候选者之一。然而，无机固体电解质（如氧化物基或硫化物基材料）和聚合物电解质仍需克服若干挑战才能取代目前使用的液体有机电解质。一种越来越被采用的克服这些挑战的方法是依赖于不同电解质系统的组合。在此，我们报告了一种新型硫掺杂单离子导电多嵌段共聚物（SIC - BCE）体系的合成与表征。这种SIC - BCE可作为电极与诸如LiPSCl之类的硫化物电解质之间的中间层，从而受益于后者的高离子电导率以及聚合物良好的界面接触和电化学稳定性。该聚合物在碳酸亚乙酯溶胀时表现出优异的离子电导率，并允许锂进行稳定的脱嵌/沉积，同时对还原和氧化具有合适的电化学稳定性。在对称的Cu|SIC - BCE|LiPSCl|SIC - BCE|Cu电池中的首次测试证实了该聚合物通过防止硫化物电解质与例如金属铜箔直接接触来稳定电极|电解质界面的总体适用性。
