Journal
ENERGY STORAGE MATERIALS
Volume 40, Issue -, Pages 415-425Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.05.038
Keywords
Lithium-sulfur batteries; Calendering-compatible sulfur-rich secondary particles; Nanostorm technology; Vapor-condensation guided aggregation; Thick sulfur electrode
Funding
- Double First-Class Construction Funds of Sichuan University
- National Natural Science Foundation of China (NNSFC) [51873126, 51422305, 51721091]
- National Natural Science Foundation of China (NNSFC)
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This study successfully developed the HSN technology to produce calendering-compatible sulfur-rich secondary particles, explored the relationship between sulfur-rich particles properties and their electrochemical performance, and achieved a high areal capacity in coin-cell experiments.
Scalable fabrication of thick sulfur electrodes with high-energy-density and good calendering-compatibility is a prerequisite for the practical success of lithium-sulfur batteries. However, this task turns out extremely challenging due to the lack of scalable production of rationally designed sulfur-rich particles, as well as fundamental understanding of the main issues of thick electrodes. Here, we develop a hail-inspired sulfur nanostorm (HSN) technology to efficiently produce calendering-compatible sulfur-rich secondary particles with customizable composition and material functions. To dig out the fundamental links between sulfur-rich particles properties and their electrochemical performance, an electro-mechanical method is proposed to evaluate the sulfur-rich particles properties (calendering-compatibility and conductivity). Meanwhile, the role of active material calendering-compatibility in controlling its electrochemical performance is discussed by a healthy microenvironment model as learned from cell biology. Consequently, a high areal capacity of 12 mAh cm(-2) @ 1 mA cm(-2) is realized in coin-cell. Furthermore, a pouch cell with a high specific capacitance of 1294 mAh g(-1) in a quasi-lean electrolyte is successfully demonstrated. In a nutshell, this study may provide guidelines for the design, fabrication and characterization of high-quality of thick sulfur cathode for Li-S batteries.
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