基于Co-N-C改性隔膜的高性能锂硫电池
High Performance Lithium-Sulfur Batteries Enabled by Co-N-C Modified Separators
崔洪涛 1王哲 1曾涛 1李婧 1冯咏梅1
作者信息
- 1. 烟台大学化学化工学院,山东 烟台 264005
- 折叠
摘要
设计制备了一种钴嵌入式叶片状氮掺杂碳(Co-N-C)材料改性隔膜用于锂硫电池,借助高分散单质钴提供的活性位点实现对正极侧中间产物多硫化物的化学锚定,抑制其溶解导致的穿梭效应;利用氮掺杂碳材料的微纳结构加快离子传输速率,提高电化学反应动力学,使改性隔膜实现吸附-催化协同作用.实验结果表明,采用此改性隔膜组装的锂硫电池,首圈比容量高达1408 mAh/g,且在1C倍率下稳定循环400 圈,衰减率仅为每圈0.05%,电池性能明显提升.
Abstract
A leaf-like cobalt-embedded nitrogen-doped carbon material(Co-N-C)is successfully synthesized and then modified on the commercial separator for Li-S batteries.The Co nanoparticles are uniformly dispersed in the prepared Co-N-C.With a large surface area and amounts of micropores,Co-N-C materials provide more active sites to trap soluble polysulfides in the cathode and effectively inhibit the shuttle effect caused by the dissolution of poly-sulfides.Meanwhile,the micro-nano structure in N-doped carbon is beneficial to accelerate ion transport and en-hance the redox reaction kinetics.Benefitting from the integrated adsorption-catalyzing effect,the Li-S cell con-structed with a Co-N-C modified separator exhibits a high capacity of 1408 mAh/g and excellent cycling stability(a low capacity fading rate of 0.05%per cycle after 400 cycles at 1 C).
关键词
锂硫电池/改性隔膜/穿梭效应/催化转化Key words
lithium-sulfur battery/modified separator/shuttle effect/catalytic conversion引用本文复制引用
基金项目
山东省重大科技创新工程项目(2019JZZY010908)
山东省自然科学基金(ZR2021ME113)
出版年
2024
国家科技期刊平台
NSTL
万方数据