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Updated: Jul 27, 2025
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Activation of Bulk Li2 S as Cathode Material for Lithium-Sulfur Batteries through Organochalcogenide-Based Redox
Qianqian Fan1, Yubing Si1, Fulong Zhu1
1College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Abstract:
Lithium sulfide (Li2 S) is considered as a promising cathode material for sulfur-based batteries. However, its activation remains to be one of the key challenges against its commercialization. The extraction of Li+ from bulk Li2 S has a high activation energy (Ea ) barrier, which is fundamentally responsible for the initial large overpotential. Herein, a systematic investigation of accelerated bulk Li2 S oxidation reaction kinetics was studied by using organochalcogenide-based redox mediators, in which phenyl ditelluride (PDTe) can significantly reduce the Ea of Li2 S and lower the initial charge potential. Simultaneously, it can alleviate the polysulfides shuttling effect by covalently anchoring the soluble polysulfides and converting them into insoluble lithium phenyl tellusulfides (PhTe-Sx Li, x>1). This alters the redox pathway and accelerates the reaction kinetics of Li2 S cathode. Consequently, the Li||Li2 S-PDTe cell shows excellent rate capability and enhanced cycling stability. The Si||Li2 S-PDTe full cell delivers a considerable capacity of 953.5 mAh g-1 at 0.2 C.
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