EAGER: New Lithium Oxy-ThioBorate Solid State Electrolytes

EAGER项目正在对新的多晶固体电解质进行基础高风险研究，这些电解质可用于开发更安全、能量密度更高的新型全固态电池。虽然锂离子电池功能强大，但在一些要求苛刻的应用中，它们存在潜在的火灾危险。在这个新项目中，正在准备和研究新的固体电解质，这将有助于创造一种新型的全固态电池，这种电池更耐用，耐腐蚀，可以容纳比传统锂电池多10倍的能量。该研究项目培养研究生在国家的最先进的固体电解质和材料合成，材料表征和固体电解质的固态电化学，并因此扩大了新的知识工作者在能源存储的关键领域的干部。此外，该项目支持的研究生将使用爱荷华州州立大学的Gaffers Guild Glass Blowing Studio进行非正式的科学教育。每一个锂电池的核心都是一种潜在的易燃有机液体电解质。如果锂电池过度充电、过热或过快地汲取太多电流，有机液体电解质会发生反应并造成损坏。在这个新项目中，正在进行基础研究，以研究新型硫代硼酸锂（LBS）和氧掺杂硫代硼酸锂（LBSO）固体电解质。该项目将研究混合硼、氧和硫的潜在结构化学，以探索三个假设：（1）这些新的LBS和LBSO固体电解质将具有有史以来最高的锂离子电导率，同时具有低密度和高电压稳定性。(2)添加氧将通过在硼原子之间形成桥接氧来改善固体电解质的化学耐久性和电化学稳定性。(3)添加硫将通过形成低结合能的低碱度BS 4 -1阴离子位点来增加锂离子电导率。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估而被认为值得支持。

This EAGER project is conducting fundamental high-risk research on new polycrystalline solid electrolytes that can be used in the development of new all solid-state batteries that are safer and more energy dense. While lithium-ion batteries are powerful, they present a potential dangerous fire hazard in some demanding applications. In this new project, new solid electrolytes are being prepared and studied that will help create a new type of all solid-state battery that is more durable and resistant to decay and can hold 10 times more energy than traditional lithium batteries. This research project trains graduate students in state-of-the-art solid electrolyte and materials synthesis, materials characterization, and solid-state electrochemistry of solid electrolytes and as such broadens the cadre of new knowledge workers in the critical field of energy storage. Further, the graduate students supported by this project will conduct informal science education using the Gaffers Guild Glass Blowing Studio at Iowa State University. At the very core of every lithium battery is a potentially flammable organic liquid electrolyte. If a lithium battery is overcharged, overheated, or draws too much current too rapidly, the organic liquid electrolyte can react and cause damage. In this new project, fundamental research is being conducted to study new kinds of lithium thioborate (LBS) and oxygen-doped lithium oxy-thioborate (LBSO) solid electrolytes. The project will examine the underlying structural chemistry of mixing boron, oxygen, and sulfur to explore three hypotheses: (1) That these new LBS and LBSO solid electrolytes will have among the highest ever reported Li ion conductivities combined with low density and high voltage stability. (2) That adding oxygen will improve the chemical durability and electrochemical stability of the solid electrolytes by forming bridging oxygens between the boron atoms. (3) That adding sulfur will increase the lithium ion conductivity by forming low basicity BS4-1 anion sites of low binding energy.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.