Study on the preparation and properties of high-flame retardant sulfur cathode

doi:10.19799/j.cnki.2095-4239.2022.0772

Abstract

Abstract:

In this study, the effects of different contents of hexachlorocyclotriphosphazene (HCCP) on flame retardancy and electrochemical performance of sulfur cathode for lithium-sulfur batteries were examined. Combustion experiments show that the addition of HCCP resulted in excellent flame retardancy of the sulfur-positive electrode. In addition, the surface morphology, chemical composition and electrochemical properties of sulfur with and without HCCP were compared using scanning electron microscopy, X-ray diffraction and electrochemical performance testing techniques. The results showed that the sulfur-positive electrode exhibited the best cycling performance and Cullen efficiency when 10% HCCP was added to it. At the current density of 0.2 C, the discharge specific capacity of the lithium-sulfur battery with 10% HCCP added to the sulfur-positive electrode remained at 975.2 mAh/g after 100 cycle; this was better than lithium-sulfur battery without HCCP in the sulfur-positive electrode. In addition, the sulfur cathode material added with HCCP was uniformly dispersed, and even after 100 cycles, no obvious cracks and no obvious increase in impedance were observed. Moreover, the presence of HCCP helped the cathode material to anchor lithium polysulfide, an intermediate product of charge and discharge. This inhibited the shuttling of lithium polysulfide through the reaction experiments of HCCP and lithium polysulfide and improved the electrochemical performance of lithium-sulfur batteries. Thus, the findings of our study can help improve the electrochemical properties of flame-retardant lithium-sulfur cathode materials.

Key words: lithium-sulfur battery, flame retardant sulfur positive, HCCP, electrochemical properties

CLC Number:

TM 911

Shun ZHANG, Fanglei ZENG, Ning LI, Ningyi YUAN. Study on the preparation and properties of high-flame retardant sulfur cathode[J]. Energy Storage Science and Technology, 2023, 12(4): 1018-1024.

Figures/Tables 8

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