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Race between Polymer Electrolytes and Inorganic Sulfide Electrolytes

March 12, 2019

Latest company news about Race between Polymer Electrolytes and Inorganic Sulfide Electrolytes

   Electrolytes are key components in electrochemical storage systems, which provide an ion-transport mechanism between the cathode and anode of a cell. As battery technologies are in continuous development, there has been growing demand for more efficient, reliable and environmentally friendly materials. Solid-state lithium ion batteries (SSLIBs) are considered as next-generation energy storage systems and solid electrolytes (SEs) are the key components for these systems. Compared to liquid electrolytes, SEs are thermally stable (safer), less toxic and provide a more compact (lighter) battery design. However, the main issue is the ionic conductivity, especially at low temperatures. So far, there are two popular types of SEs: (1) inorganic solid electrolytes (InSEs) and (2) polymer electrolytes (PEs). Among InSEs, sulfide-based SEs are providing very high ionic conductivities (up to 10−2 S/cm) and they can easily compete with liquid electrolytes (LEs). On the other hand, they are much more expensive than LEs. PEs can be produced at less cost than InSEs but their conductivities are still not sufficient for higher performances. This paper reviews the most efficient SEs and compares them in terms of their performances and costs. The challenges associated with the current state-of-the-art electrolytes and their cost-reduction potentials are described.

  we provides strong reasons for sulfide/phosphide-based solid electrolytes vs. oxide/phosphate ones. Besides others, these have higher conductivity, feasible handling options for side reactions in production under ambient conditions, and mechanical properties such as ductility. Finally, it seems reasonable and feasible to combine sulfide/phosphidebased solid electrolytes with polymer electrolytes as a glue between the grains. This approach can yield excellent solutions for successful Li-dendrite suppression in highly compressed films as well as a simple and effective adaption of solid electrolytes to conventional Li-Ion manufacturing, particularly if this approach is combined with an in-situ Li metal anode formation upon the first charge in the formation step.

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