LLZO-based hybrid electrolyte to suppress the shuttle effect of Li-S battery

doi:10.12028/j.issn.2095-4239.2016.0034

Abstract

Abstract: Compared with traditional lithium-ion batteries, lithium-sulfur (Li-S) batteries have many advantages such as high specific capacity, high energy density and environment-friendly characteristic, which makes them a promising system for electric vehicles and energy storage. However, the Li-S batteries have been facing problems, such as the shuttle effect, low efficiency, and volume change during cycling. In this paper, we try to suppress the shuttle effect by introducing a LLZO-based hybrid electrolyte. Firstly, we prepare the dense LLZO solid electrolyte with the ionic conductivity of 6.4×104 S/cm; then we use the LLZO as the separator, Li anode, and S-C composite cathode to assemble Li-S test cells. The electrochemical test results indicate that the cell can obtain a Coulomb efficiency closely to 100%. The post-test examination shows that element S can only be found on the side of LLZO facing the S-C cathode, not on the side facing the Li anode, suggesting that the LLZO can effectively block the transport of the dissolved polysulfides.

Key words: LLZO, Li-S battery, oxidized graphene, the shuttle effect, coulomb efficiency

LLZO-based hybrid electrolyte to suppress the shuttle effect of Li-S battery. LLZO-based hybrid electrolyte to suppress the shuttle effect of Li-S battery[J]. Energy Storage Science and Technology, 2016, 5(5): 719-724.

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