A Highly Durable Rubber-Derived Lithium-Conducting Elastomer for Lithium Metal Batteries

Elastomers offer attractive advantages over classical solid-state electrolytes in terms of ensuring stable interfacial contact and maintaining fatigue durability, but the low ionic conductivity obstructs their practical applications in long-life lithium metal batteries. In this work, rubber-derived lithium-conducting elastomer has been developed via sulfur vulcanization of nitrile butadiene rubber with a polymerizable ionic liquid to provide both high resilience and dramatically improved ionic conductivity. Owing to the chemically crosslinked network between rubber chains and ionic liquid fragments generated during vulcanization, the elastic lithium-conductor achieves high resilience of 0.92 MJ m(-3), superior cyclic durability of 1000 cycles at 50% strain, and high room-temperature ionic conductivity of 2.7 x 10(-4) S cm(-1). Consequently, the corresponding solid-state lithium/LiFePO4 battery exhibits a high capacity of approximate to 146 mAh g(-1) with a high capacity retention of 94.3% for up to 300 cycles.

Automated summary

A rubber-derived lithium-conducting elastomer with high resilience and improved ionic conductivity has been developed by sulfur vulcanization of nitrile butadiene rubber with a polymerizable ionic liquid. The elastic lithium-conductor exhibits high resilience, excellent cyclic durability, and high room-temperature ionic conductivity, leading to a solid-state lithium/LiFePO4 battery with high capacity and capacity retention.