Rechargeable lithium metal batteries can reduce the cost of energy storage for both transportation and grid applications. In order to combat issues of infinite volume change, dendrite growth and parasitic reactions with electrolytes, we have employed several approaches, which includes 3D hosts, new electrolytes and nanocomposite coatings for lithium protection. In one example, an ether-based electrolyte was identified that enables high-efficiency cycling of lithium metal with coulombic efficiency of &gt; 99.5% at current densities of &gt; 2 mA/cm<sup>2</sup>. Moreover, the electrolyte is high compatible with a sulfur-based cathode, which demonstrated &gt; 1000 cycles with negligible capacity degradation. In another example, we develop polymeric and inorganic coatings for lithium metal by using an in-situ reactive chemistry of the electrolyte. Such a approach has generated coatings that enhance uniform lithium flux and dendrite-free cycling.

Electrolytes and coatings for high-efficiency lithium-metal anodes

2019 Fall National Meeting

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