Study of Fast Catalytic Conversion of Polysulfides by Porous N-Co3O4 Nanocages Embedded with rGONR/CNT Composite for High-Rate Li2S-Based Lithium Sulfur Batteries

Gokul Raj Deivendran, Manojkumar Seenivasan, Yi Shiuan Wu, Jeng Kuei Chang, Rajan Jose, Mrinal Poddar, Chia Liang Sun, Chun Chen Yang*

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

1 引文 斯高帕斯(Scopus)

摘要

Lithium sulfide (Li2S)-based batteries are considered promising alternative sources for intercalation-type lithium-ion batteries because of their high theoretical capacity. However, the practical application of Li2S is limited by two major issues: the dissolution of polysulfides (PSs) and the poor electronic conductivity of the Li2S cathode materials. To tackle these problems, the as-prepared 3D porous cobalt oxide nanocages (N-Co3O4) were embedded with a two-dimensional (2D) graphene oxide nanoribbon (rGONR) and a one-dimensional (1D) carbon nanotube (CNT) carbon matrix to form N-Co3O4/rGONR/CNT (N-Co3O4/C) double-shelled metal-carbon composites. This study uses the infiltration-evaporation method to incorporate Li2S into the porous nanocage carbon structure (N-Co3O4/C) as a sulfur host material. This interconnected metal-carbon matrix design offered good electron conductivity (∼3.51 × 10-3 S cm-1), high diffusion coefficients, suitable surface area, and pore size (2 to 14 nm) for PS confinement. Our porous N-Co3O4 filler synergistically immobilized PSs inside the cathode via chemisorption, impeding the shuttle effect in LSBs. In situ XRD analysis reveals that the designed N-Co3O4/C with a spinel-based structure as a catalyst facilitates Li2S conversion with minimal polarization in the first cycle. The advantages of the as-fabricated Li2S-N-Co3O4/rGONR/CNT composite cathode delivered a high initial specific capacity of 1004 mA h g-1 at 0.1C and 413 mAh g-1 on the 1000th cycle at 3C, demonstrating good retention capability. Therefore, the N-Co3O4/C-modified composite cathode shows excellent electrochemical performance, implying that LSBs offer promising practical applications in high-performance energy storage devices.

原文英語
頁(從 - 到)14553-14567
頁數15
期刊ACS Sustainable Chemistry and Engineering
12
發行號39
DOIs
出版狀態已出版 - 30 09 2024

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© 2024 American Chemical Society.

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