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All-solid-state Li-S battery via spray deposition

喷雾沉积全固态锂硫电池

基本信息

批准号：
2441145
负责人：
金额：
--
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2441145
关键词：
solid state Li battery via

项目摘要

A key to the practical implementation of the Li-S battery is enabling the reversible and dendrite-free plating and stripping of the Li-metal anode at practical current densities (> 10 mA cm-2) and practical coulombic efficiencies (>99.9%). Several strategies have been proposed to achieve this target, from bulk electrolyte modifications to SEI engineering to in-situ and ex-situ surface modification. The Li-S chemistry imposes even more severe constraints having to protect the Li-metal from polysulphides shuttling between the sulfur cathode and the Li-metal anode, hampering the rechargeability of the battery, further decreasing coulombic efficiency/cell capacity and corroding the Li anode. Replacing the liquid electrolyte with a solid could address all these concerns. The SOLBAT fast-start project has made a good progress in understanding the fundamental causes at the origin of the poor cyclability and dendrite growth in solid electrolytes and toward the realization of thin film ceramic membranes. Sulfide-based solid electrolytes in particular have ionic conductivities and comparable to liquid electrolytes, they are softer and therefore more easily processable and densified at scale and their densities are comparable with the in particular solid electrolytes have higher ionic conductivities, soterIn particular, we have are now able to spray deposit Argyrodites (Li6PS5Cl) are particular. Experimental techniques: 4-electrodes electrochemistry, electrochemical impedance spectroscopy, in-situ and ex-situ Raman, XPS, AFM, TOF-SIMS and low-dose electron microscopy techniques will be used to characterize the interphase layer and its growth.The EPSRC theme is Energy.

Li-S电池实际实施的关键是在实际电流密度（> 10 mA cm-2）和实际库伦效率（>99.9%）下实现锂金属阳极的可逆且无枝晶的电镀和剥离。已经提出了几种策略来实现这一目标，从本体电解质改性到SEI工程到原位和非原位表面改性。Li-S化学施加了甚至更严格的限制，必须保护Li金属免受在硫阴极和Li金属阳极之间穿梭的多硫化物的影响，这阻碍了电池的可再充电性，进一步降低了库仑效率/电池容量并腐蚀了Li阳极。用固体电解质代替液体电解质可以解决所有这些问题。SOLBAT快速启动项目在了解固体电解质中循环性差和枝晶生长的根本原因以及实现薄膜陶瓷膜方面取得了良好进展。基于硫化物的固体电解质特别地具有离子电导率并且与液体电解质相当，它们更软并且因此更容易加工和按比例致密化，并且它们的密度与特别地具有更高离子电导率的固体电解质相当。特别地，我们现在能够喷射存款Argyrodite（Li 6PS 5Cl）。实验技术：四电极电化学、电化学阻抗谱、原位和非原位拉曼、XPS、AFM、TOF-SIMS和低剂量电子显微镜技术将用于表征界面层及其生长。EPSRC主题是能量。