高阻燃硫正极的制备及其性能

doi:10.19799/j.cnki.2095-4239.2022.0772

摘要/Abstract

摘要：

本工作系统研究了锂硫电池硫正极中添加不同含量的六氯环三磷腈对硫正极阻燃性能和电化学性能的影响。通过燃烧实验，发现六氯环三磷腈的加入可使硫正极表现出优异的阻燃性能。此外，通过借助扫描电镜（SEM）、X射线衍射（XRD）技术和电化学性能测试等手段，对比了添加和未添加六氯环三磷腈硫正极循环前后的表面形貌、组成成分和电化学性能。结果表明，当六氯环三磷腈添加量为10%时，硫正极表现出最优的循环性能和库仑效率。在0.2 C电流密度下，硫正极中添加量为10%六氯环三磷腈的锂硫电池在100次循环后放电比容量仍保持在975.2 mAh/g，明显优于硫正极中未添加六氯环三磷腈的锂硫电池。而且，添加六氯环三磷腈的硫正极材料分散均匀，即使循环100次后，也未出现明显的裂纹，阻抗也未明显增加。此外，通过六氯环三磷腈和多硫化锂的反应实验，发现六氯环三磷腈的存在有助于锚定充放电中间产物多硫化锂，进而抑制多硫化锂的穿梭，提升锂硫电池的电化学性能，这为提高阻燃锂硫正极材料的电化学性能提供了新的思路。

关键词: 锂硫电池, 阻燃硫正极, 六氯环三磷腈, 电化学性能

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

中图分类号:

TM 911

张顺, 曾芳磊, 李宁, 袁宁一. 高阻燃硫正极的制备及其性能[J]. 储能科学与技术, 2023, 12(4): 1018-1024.

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.

图/表 8

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