Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 35, Pages 41698-41706Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11594
Keywords
modified separator; oxygen defect; amorphous; electrocatalyst; lithium-sulfur batteries; polysulfides
Funding
- joint fund project of Guangdong and Guangxi [2020A1515410008]
- Science and Technology Program of Guangdong Province [2018B050502010]
- Science and Technology Program of Guangzhou [2019050001]
- National Key Research and Development Program of China [2019YFE0198000]
- third batch of Zhaoqing Xijiang Talent Innovation Team project
- Guangxi Innovation-driven Science and Technology Major Special Project [AA17204022]
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The defect-rich amorphous a-Fe3O4-x/GO material, with a unique open framework structure, serves as both an adsorber and electrocatalyst for Li-S batteries. Its oxygen defects are capable of absorbing polysulfides and boosting their conversion rate, leading to enhanced stability and activity during extended cycles.
The sluggish sulfur reduction reaction, severe shuttle effect, and poor conductivity of sulfur species are three main problems in lithium-sulfur (Li-S) batteries. Functional materials with a strong affinity and catalytic effect toward polysulfides play a key role in addressing these issues. Herein, we report a defect-rich amorphous a-Fe3O4-x/GO material with a nanocube-interlocked structure as an adsorber as well as an electrocatalyst for the Li-S battery. The composition and defect structure of the material are determined by X-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy measurements. The distinctive open framework architecture of the as-engineered composite inherited from the metal-organic framework precursor ensures the stability and activity of the catalyst during extended cycles. The oxygen defects in the amorphous structure are capable of absorbing polysulfides and similarly work as catalytic centers to boost polysulfide conversion. Taking advantage of a-Fe3O4-x/GO on the separator surface, the Li-S battery shows a capacity over 610 mA h g(-1) at 1 C and a low decay rate of 0.12% per cycle over 500 cycles and superior rate capability. The functional material made via the low-cost synthesis process provides a potential solution for advanced Li-S batteries.
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