Liu Fengquan, Hu Zhiyu, Xue Jinxin, Huo Hong, Zhou Jianjun, Li Lin
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University Beijing 100875 P. R. China
RSC Adv. 2019 Dec 6;9(69):40471-40477. doi: 10.1039/c9ra08238g. eCollection 2019 Dec 3.
Lithium-sulfur (Li-S) batteries have been considered as one of the most promising next-generation energy storage systems with high-energy density. The huge volumetric change of sulfur ( 80% increase in volume) in the cathode during discharge is one of the factors affecting the battery performance, which can be remedied with a binder. Herein, a self-crosslinking polyacrylate latex (PAL) is synthesized and used as a binder for the sulfur cathode of a Li-S battery to keep the cathode structure stable. The synthesized PAL has nano-sized latex particles and a low glass transition temperature ( ), which will ensure a uniform dispersion and good adhesion in the cathode. This crosslinking structure can provide fine elasticity to recover from the deformation due to volumetric change. The stable cathode structure, stemming from the fine elasticity of the PAL binder, can facilitate ion migration and diffusion to decrease the polarization. Therefore, the Li-S batteries with the PAL binder can function well with excellent cycling stability and superior C-rate performance.
锂硫（Li-S）电池被认为是最具前景的下一代高能量密度储能系统之一。放电过程中阴极硫的巨大体积变化（体积增加80%）是影响电池性能的因素之一，而这可以通过粘结剂来补救。在此，合成了一种自交联聚丙烯酸酯乳胶（PAL）并将其用作锂硫电池硫阴极的粘结剂，以保持阴极结构稳定。合成的PAL具有纳米级乳胶颗粒和较低的玻璃化转变温度（ ），这将确保其在阴极中均匀分散并具有良好的粘附性。这种交联结构可以提供良好的弹性，以从体积变化引起的变形中恢复。源于PAL粘结剂良好弹性的稳定阴极结构，可促进离子迁移和扩散，以降低极化。因此，具有PAL粘结剂的锂硫电池能够良好运行，具有出色的循环稳定性和优异的倍率性能。
