Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 49, Pages 42198-42206Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10795
Keywords
electrospun nanofibers; ion selective; dual functions; separator; lithium-sulfur battery
Funding
- National Natural Science Foundation of China [21604010, 51433001]
- Fundamental Research Funds for the Central Universities [2232017D-01]
- Chenguang Program - Shanghai Education Development Foundation
- Chenguang Program - Shanghai Municipal Education Commission [16CG39]
- Program of Shanghai Academic Research Leader [17XD1400100]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
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Lithium-sulfur (Li-S) batteries have attracted great attention because of their high energy density and high theoretical capacity. However, the shuttle effect caused by the dissolution of polysulfides in liquid electrolytes severely hinders their practical applications. Herein, we originally propose a carboxyl functional polyamide acid (PAA) nanofiber separator with dual functions for inhibiting polysulfide transfer and promoting Li+ migration via a one-step electrospinning synthesis method. Especially, the functional groups of -COOH in PAA separators provide an electronegative environment, which promotes the transport of Li+ but suppresses the migration of negative polysulfide anions. Therefore, the PAA nanofiber separator can act as an efficient electrostatic shield to restrict the polysulfide on the cathode side, while efficiently promoting Li+ transfer across the separator. As a result, an ultralow decay rate of only 0.12% per cycle is achieved for the PAA nanofiber separator after 200 cycles at 0.2 C, which is less than half that (0.26% per cycle) of the commercial Celgard separator.
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