Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 25, Pages 30152-30160Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c03566
Keywords
Li-S battery; interlayer; heterostructure; amorphous-crystalline; MnO2
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Amorphous-crystalline heterostructured MnO2 (ACM) prepared through a simple calcination process was employed as the functional interlayer in lithium-sulfur batteries. ACM serves as an effective trapper for polysulfides and a multifunctional electrocatalyst. The unique interlayer design enhances the rate performance and cycle stability of the batteries.
Thepractical application of lithium-sulfur batteries (LSBs) isstill hindered by several technical issues, including severe polysulfideshuttling and sluggish redox kinetics, which reduces the sulfur utilizationand further results in low energy density. Herein, amorphous-crystallineheterostructured MnO2 (ACM) prepared through a simple calcinationprocess was employed as the functional interlayer to play a doublerole as effective trapper and multifunctional electrocatalyst forLSBs. ACM not only combines the strong sulfur chemisorption of theamorphous MnO2 (AM) and fast Li+ transportationof the crystalline MnO2(CM) but also accelerates the interfacecharge transfer at the amorphous/crystalline interfaces. The LSBswith such unique interlayer exhibited an excellent rate performanceof 1155.5 mAh center dot g(-1) at 0.2 C and 692.9 mAh center dot g(-1) at 3 C and a low decay rate of 0.071% per cycle over500 cycles at 0.5 C. Even for a high sulfur loading of 5 mg center dot cm(-2) at 0.1 C, a high capacity retention of 92.3% couldalso be achieved after 100 cycles. The concept of amorphous-crystallineheterostructures prepared by crystallization regulation might alsobe used for other electronic devices and catalyst designs.
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