Palladium nanocrystals-imbedded mesoporous hollow carbon spheres with enhanced electrochemical kinetics for high performance lithium sulfur batteries

Ma, Shaobo; Wang, Liguang; Wang, Yang; Zuo, Pengjian; He, Mengxue; Zhang, Han; Ma, Lu; Wu, Tianpin; Yin, Geping

doi:10.1016/j.carbon.2018.11.086

Title: Palladium nanocrystals-imbedded mesoporous hollow carbon spheres with enhanced electrochemical kinetics for high performance lithium sulfur batteries

Journal Article · 29 November 2018 · Carbon

DOI: https://doi.org/10.1016/j.carbon.2018.11.086 · OSTI ID:1504769

Ma, Shaobo ^[1]; Wang, Liguang ^[2]; Wang, Yang ^[1];

^[1]; He, Mengxue ^[1]; Zhang, Han ^[1]; Ma, Lu ^[3]; Wu, Tianpin ^[3]; Yin, Geping ^[1]

Harbin Inst. of Technology, Harbin (China)
City Univ. of Hong Kong, Hong Kong (China)
Argonne National Lab. (ANL), Argonne, IL (United States)

Lithium sulfur (Li-S) battery is one promising candidate for high energy density electrochemical energy storage system. Accelerating the sluggish reaction kinetics of sulfur cathode and suppressing the lithium polysulfide (LiPS) shuttle are crucial for the high-performance Li-S batteries. Herein, we prepared the catalytic palladium nano-particles (Pd NPs) imbedded in hollow carbon spheres (Pd@HCS) as sulfur host by a sacrificial template method. Benefitting from the hollow nanostructure and strong chemisorption ability of Pd NPs, Pd@HCS can effectively mitigate the LiPS shuttling via physical and chemical pathways. Furthermore, the Pd NPs as one electrocatalyst can accelerate the redox reaction kinetics of LiPS. The theoretical calculation and X-ray absorption spectroscopy elucidate that the moderate Pd-S bonding between Pd NPs and sulfur species are beneficial to LiPS conversion. The Pd@HCS/S electrode delivers a high initial capacity of 1306 mAh g^–1 and 885 mAh g^–1 after 100 cycles at 0.2 C, as well as the good cycling stability (a slight capacity decay of 0.068% per cycle over 400 cycles at 1 C). In conclusion, the Pd@HCS/S cathode with the high sulfur loading of 5.88 mg cm^–2 delivers an initial capacity of 873 mAh g^–1 at 0.2 C and good capacity retention of 85% after 100 cycles.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1504769

Journal Information:: Carbon, Journal Name: Carbon Journal Issue: C Vol. 143; ISSN 0008-6223

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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