Tuning Nitrogen in Graphitic Carbon Nitride Enabling Enhanced Performance for Polysulfide Confinement in Li–S Batteries,Energy & Fuels

当前位置： X-MOL 学术 › Energy Fuels › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Tuning Nitrogen in Graphitic Carbon Nitride Enabling Enhanced Performance for Polysulfide Confinement in Li–S Batteries
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-08-03 , DOI: 10.1021/acs.energyfuels.0c02278
Mingjie Du ₁ , Xiaoqing Tian ₁ , Ran Ran ₁ , Wei Zhou ₁ , Kaiming Liao ₁ , Zongping Shao ₁

Affiliation

The cycling performance of lithium–sulfur (Li–S) batteries, which is a major parameter determining the practical application of such an advanced high-energy-density battery system (1675 mA h g^–1), is strongly affected by the properties of the cathodic sulfur hosts. As a desirable sulfur host, it should possess high surface area, good electronic conductivity, and superior physisorption and chemisorption to polysulfides. Here, by taking advantage of the magnesiothermic denitriding technology, the graphitic carbon nitride (GCN) with a tunable nitrogen content, surface area, and pore volume has been designed as a sulfur host for high-performance Li–S batteries. With a nitrogen content of ∼6%, a surface area of 594 m² g^–1, and a pore volume of about 2 cm³ g^–1, the GCN-based host can retain sulfur and allow its reversible convention within cathodic region, thereby delivering a high capacity of 852.2 mA h g^–1 at 0.5 C with a low capacity decay of 0.12% per cycle within 300 cycles. This work provides a feasible way to design nitrogen-doped carbon materials with tunable nitrogen content and enlightens the host material design for practical Li–S batteries.

中文翻译：

调整石墨化氮化物中的氮，增强Li-S电池中多硫化物限制的性能

锂-硫（Li-S）电池的循环性能是决定这种先进的高能量密度电池系统（1675 mA hg ^–1）实际应用的主要参数，其性能受到强烈影响。阴极硫宿主。作为理想的硫主体，它应具有高表面积，良好的电子传导性以及对多硫化物的优异的物理吸附和化学吸附。在这里，利用镁热脱氮技术，将具有可调氮含量，表面积和孔体积的石墨氮化碳（GCN）设计为高性能Li-S电池的硫基质。氮含量约为6％，表面积为594 m ² g ^–1，孔体积约为2 cm³ g ^–1，基于GCN的主体可以保留硫，并允许其在阴极区域内具有可逆的惯例，从而在0.5 C时提供852.2 mA hg ^–1的高容量，在300个循环内每个循环的容量衰减为0.12％。这项工作为设计具有可调氮含量的氮掺杂碳材料提供了可行的方法，并为实际的Li-S电池的主体材料设计提供了启发。

更新日期：2020-09-18

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南