A sulfur host based on silicon oxycarbide for advanced lithium‑sulfur batteries
A sulfur host based on silicon oxycarbide for advanced lithium‑sulfur batteries
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DOI：
10.1016/j.est.2023.108388
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发表时间：
2023-11
影响因子：
9.4
通讯作者：
M. M. Amaral-M.;S. B. Mujib;Érick A. Santos;J. Ribeiro;H. Zanin;Gurpreet Singh
中科院分区：
文献类型：
--
作者：
M. M. Amaral-M.;S. B. Mujib;Érick A. Santos;J. Ribeiro;H. Zanin;Gurpreet Singh
锂硫（Lisingle bondS）电池是有前途的电池系统，使用丰富的材料提供高容量和能量密度，但它们有一个显著的缺点，称为穿梭效应，这限制了它们的容量，增加了它们的内阻，并导致循环性能差。因此，一些努力集中在克服这个缺点，包括开发基于碳质主体的新型阴极材料以吸附多硫化锂（LiPS）并抑制穿梭效应，这是一项具有挑战性的任务。在这种情况下，本研究调查使用的硅氧碳化物（SiOC）作为硫主机的Lisingle bondS系统具有出色的电化学性能。以1，3，5-三乙烯基-1，1，3，5，5-五甲基三硅氧烷（TPTS）为前驱体，在800 °C下采用热解法合成了SiOC粉体。硫加载过程由在150 °C下进行的熔融扩散过程组成，其成功地将硫扩散到SiOC多孔结构中。然后，通过多种技术研究了S-SiOC复合材料的形貌和结构，证实了硫负载过程的有效性。S-SiOC复合阴极提供稳定的容量，在83.75 mA gs-1（0.05C，考虑1C = 1675 mA gs-1）的电流密度下50次循环后呈现711 mAh gs-1（其初始容量的约50.3%）的可逆充电容量，表明该复合物是用于Lisingle bondS电池的有前景的材料。
Lithium‑sulfur (Lisingle bondS) batteries are promising battery systems that provide high capacity and energy density using abundant materials, but they have a significant drawback known as the shuttle effect, which restricts their capacity, increases their internal resistance, and results in poor cyclability. Therefore, several efforts are being focused on overcoming this drawback, including the development of novel cathode materials based on carbonaceous hosts to adsorb lithium polysulfides (LiPS) and inhibit the shuttle effect, which is a challenging task. In this context, this study investigates the use of silicon oxycarbide (SiOC) as the sulfur host for Lisingle bondS systems with outstanding electrochemical performance. SiOC powder has been synthesized by pyrolysis process at 800 °C, using 1,3,5-trivinyl-1,1,3,5,5-pentamethyltrisiloxane (TPTS) as the precursor. The sulfur loading procedure consists of a melt-diffusion process conducted at 150 °C, which successfully diffused sulfur into the SiOC porous structure. Then, the S-SiOC composite material morphology and structure have been investigated by several techniques, which confirmed the efficacy of the sulfur loading process. The S-SiOC composite cathode provides a stable capacity, presenting a reversible charge capacity of 711 mAh gs−1(≈50.3 % of its initial capacity) after 50 cycles at a current density of 83.75 mA gs−1(0.05C, considering 1C = 1675 mA gs−1), indicating that this composite is a promising material for Lisingle bondS batteries.