基于平面三角形基团的新型无机固体电解质探索及其在储能电池中的应用

项目名称： 基于平面三角形基团的新型无机固体电解质探索及其在储能电池中的应用

项目编号： No.51272049

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 贺蒙

作者单位： 国家纳米科学中心

项目金额： 78万元

中文摘要： 风电、光电等可再生绿色能源以及智能电网的发展都需要安全高效的储能电池系统。采用无机固体电解质可以避免现有电池使用液体电解质带来的泄漏、起火、爆炸等问题，从根本上提高电池安全性。尽管进行了长期、广泛的研究，但目前仍然缺乏具有良好综合性能的固体电解质材料。迄今为止，探索无机固体电解质材料的研究工作主要集中于由高价阳离子与氧、硫构成的四面体或八面体所组成的结构中，而对由平面三角形基团组成的结构一直没有进行系统地研究。本项目申请人在前期研究工作中发现，通过异价离子替代，可以在由平面三角形基团组成的结构中引入大量的锂离子或钠离子空位并产生显著的离子导电性。在此基础上，本项目拟对由平面三角形基团构成的结构进行异价离子替代等系统研究，探索离子替代引起的成相规律、结构演变特点，通过第一性原理与价键分析，深入理解平面三角形结构中离子导电的特性，以期发现新型固体电解质材料并应用于储能电池。

中文关键词： 固体电解质；离子导体；晶体结构；全固态锂离子电池；键价

英文摘要： Energy storage batteries of high efficiency and safety are imperative for the development of the renewable energy sources and smart grid. Inorganic solid state electrolyte is one of the key materials for developing all solid stationary energy storage batteries. Due to free of leakage and explosion, solid batteries do not have serious safety problems as for batteries using liquid electrolyte. Unfortunately, current solid state electrolyte could not meet all demands and great efforts have to be paid further. So far, exploration of inorganic solid state electrolyte has been mainly focused on structures consisting of tetrahedral and octahedral groups. No systematic studies have been performed on structures which are composed of triangular planer groups. Recently, we have found that Li and Na cation vacancies can be generated by aliovalent substitutions in the structures consisting of triangular planer groups, and significant ionic conductivity was achieved. Accordingly, we propose to investigate the inorganic electrolyte materials composed of triangular planer groups systematically. The structural evolution and ionic conductivity caused by the aliovalent substitutions will be investigated mainly. New solid state electrolyte with excellent performance is expected and will be demonstrated in energy storage batteries.

英文关键词： solid electrolyte；ion conductor；crystal structure；all solid state lithium ion battery；bond valence