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基于仿生学电极结构设计的高负载锂硫电池研究

批准号51602058 学科分类无机非金属能量存储材料 ( E021002 )
项目负责人艾果 负责人职称工程师 依托单位工业和信息化部电子第五研究所
资助金额20.00
万元
项目类别青年科学基金项目 研究期限2017 年 01 月 01 日 至
2019 年 12 月 31 日
中文主题词锂硫电池;仿生学;硫正极结构;高负载;导电粘合剂
英文主题词Li-S batteries ;bio-mimetic;electrode structure;high loading;conductive binder

摘要

中文摘要 锂硫电池已成为近年最受关注的研究领域之一,也是最有潜力商用化的新型储能体系。本项目将主要解决高负载、高硫含量锂硫电池的应用化进程中的几个基础科学问题,采用巧妙的方法模拟、重构高效蚁巢仿生结构进行锂硫电池电极结构设计,从机理层面逐一发现并解决问题:利用蚁巢仿生结构的存储能力的优势,抑制多硫化物的扩散;利用巢穴微孔间高效运输通道,避免离子运输通道堵塞;并通过导电粘合剂及碳管搭建结构,增强机械强度,提高活性物质利用率。项目将从机理层面充分挖掘该仿生电极结构对硫化物的负载能力,实现3 mg•cm-2的负载量、硫含量高达85 wt%的电极结构,并实现综合性能优异的高负载、高硫含量锂硫电池,达到世界领先水平。同时,保障该方法制备工艺的低成本,并与锂电池生产工艺兼容,为锂硫电池的应用化进程提供支持。
英文摘要 Lithium-sulfur (Li-S) battery is a promising candidate for the next generation energy storage device due to their high gravimetric energy density and low cost. Enormous efforts have been put on increasing the sulfur loading and sulfur/inactive-materials ratio of Li-S batteries. Inspired from the nature-created ant-nest structure, a novel Li-S electrode is designed to meet all these goals. With only three simple manufacturing-friendly methods, which includes slurry ball-milling, doctor-blade based laminate casting, and feasible sacrificial method, the ant-nest design can be successfully re-created in a Li-S electrode in this project, and the capabilities of ant-nest structures are studied with detailed reaction mechanism method, which include facilitate fast ion transportation, sustain polysulfide dissolution, and assist efficient precipitation. High cycling stability of Li-S batteries for practical application has been achieved with up to 3mgcm-2 sulfur loading. What’s more, the Li-S electrodes with up to 85% sulfur ratio have been achieved, which further demonstrates the efficient design of this novel ant-nest structure. This project aims at recreating the ant-nest structure with simple method, and solving the scientific problems in the Li-S battery with the bio-mimic design and deep mechanism study.
结题摘要

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