通过硫酸锂的氢气还原来合成应用于硫化物固态电解质的高纯硫化锂
Synthesis of High Purity Lithium Sulfide for Sulfide Solid Electrolyte Applications through Hydrogen Reduction of Lithium Sulfate
木村新文1
作者信息
- 1. 株式会社Chemicoat,日本 千叶 东金 283-0826
- 折叠
摘要
利用硫酸锂(Li2SO4)的氢气还原来实现清洁、廉价及可持续地合成高纯硫化锂(Li2S).系统研究了 Li2SO4-Li2S混合物的融解、烧结及还原行为,并成功研发了一种可合成出具有良好结晶度和单一相Li2S的三步还原法.研究发现,跟其他材料相比,比如碳、莫来石、石英、氮化硼和不锈钢,高纯氧化铝因为不受Li2SO4-Li2S熔体的侵蚀而成为最适合制备高纯Li2S的坩埚材料.研究还进一步证实了跟利用市售的Li2S制出的硫银锗矿型硫化物固态电解(Li6PS5Cl)(1.12mS.cm-1)相比,利用新合成的Li2S制备出的Li6PS5Cl具有较高的纯度和高得多的室温离子电导率(2.77 mS·cm-1).这种新方法将为制备应用于硫化物固态电解质的电池级Li2S提供一个更优途径.
Abstract
This paper is aimed to present a clean,inexpensive and sustainable method to synthesize high purity lithium sulfide(Li2S)powder through hydrogen reduction of lithium sulfate(Li2SO4).A three-step reduction process has been successfully developed to synthesize well-crystallized and single-phase Li2S powder by investigating the melting,sintering and reduction behavior of the mixtures of Li2SO4-Li2S.High purity alumina was found to be the most suitable crucible material for producing high purity Li2S,because it was not attacked by the Li2SO4-Li2S melt during heating,as compared with other materials,such as carbon,mullite,quartz,boron nitride and stainless steel.The use of synthesized Li2S resulted in higher purity and substantially higher room temperature ionic conductivity(2.77 mS·cm-1)for the argyrodite sulfide electrolyte Li6PS5Cl than commercial Li2S(1.12 mS·cm-1).This novel method offers a great opportunity to produce battery grade Li2S for sulfide solid electrolyte applications.
关键词
硫化锂/硫酸锂/氢气还原/硫化物固态电解质/全固态锂离子电池Key words
lithium sulfide/lithium sulfate/hydrogen reduction/sulfide solid electrolyte/all-solid-state lithium-ion battery引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据