A Carbonyl Compound-Based Flexible Cathode with Superior Rate Performance and Cyclic Stability for Flexible Lithium-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 29226388.
- Also identified by DOI 10.1002/adma.201703868.
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Abstract
A sulfur-linked carbonyl-based poly(2,5-dihydroxyl-1,4-benzoquinonyl sulfide) (PDHBQS) compound is synthesized and used as cathode material for lithium-ion batteries (LIBs). Flexible binder-free composite cathode with single-wall carbon nanotubes (PDHBQS-SWCNTs) is then fabricated through vacuum filtration method with SWCNTs. Electrochemical measurements show that PDHBQS-SWCNTs cathode can deliver a discharge capacity of 182 mA h g<sup>-1</sup> (0.9 mA h cm<sup>-2</sup> ) at a current rate of 50 mA g<sup>-1</sup> and a potential window of 1.5 V-3.5 V. The cathode delivers a capacity of 75 mA h g<sup>-1</sup> (0.47 mA h cm<sup>-2</sup> ) at 5000 mA g<sup>-1</sup> , which confirms its good rate performance at high current density. PDHBQS-SWCNTs flexible cathode retains 89% of its initial capacity at 250 mA g<sup>-1</sup> after 500 charge-discharge cycles. Furthermore, large-area (28 cm<sup>2</sup> ) flexible batteries based on PDHBQS-SWCNTs cathode and lithium foils anode are also assembled. The flexible battery shows good electrochemical activities with continuous bending, which retains 88% of its initial discharge capacity after 2000 bending cycles. The significant capacity, high rate performance, superior cyclic performance, and good flexibility make this material a promising candidate for a future application of flexible LIBs.