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Published on: November 11, 2013
Enhanced Lithium-Ion Transport and Sulfur Conversion Kinetics in Li-S Batteries via High-Dielectric Composite
Jia Zhang1, Hao Yang1, Xiaoqing Zhu1
1State Key Laboratory for Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
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The development of lithium-sulfur (Li-S) batteries is hindered by lithium dendrite growth and slow sulfur redox kinetics. Here, we report a composite separator (CAFS) composed of nanocellulose fibers (NCF) and high-dielectric aluminum oxide (Al2O3) nanoparticles. The Al2O3 component produces a directional electric field under external bias, anchoring bis(trifluoromethanesulfonyl)imide (TFSI-) anions and promoting lithium salt dissociation, which enhances lithium-ion (Li+) transport and stabilizes the anode. Additionally, the electric field actively interacts with lithium polysulfides (LiPSs), improving sulfur conversion kinetics and guiding uniform, three-dimensional Li2S deposition. The CAFS separator exhibits a high Li+ transference number (0.776), enables ultrastable Li plating/stripping over 1000 h at 1 mA cm-2, and ensures superior cycling performance with a capacity decay rate of only 0.002% per cycle over 500 cycles at 1 C. This work offers a scalable, low-cost, and eco-friendly strategy to accelerate the commercial viability of next-generation Li-S batteries.
