Flame-assisted synthesis of Li ion battery materials

0928964 Axelbaum该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该奖项下的研究旨在开发火焰合成过程所需的科学，以合成锂锰尖晶石（LiMn 2 O 4）的纳米颗粒，并将此过程扩展到生产橄榄石型磷酸铁锂（LiFePO 4）纳米颗粒。 科学的理解是至关重要的，以便能够控制粒度，掺杂和碳涂层。 如果成功，这项工作将为生产高性能锂离子电池材料提供一种低成本，高产量的方法。随着减少对外国石油和温室气体排放的依赖的需求不断增加，这项研究将使混合动力汽车和可再生能源的使用成为可能。基本方法是将前体的细气溶胶引入预混或扩散火焰中，在那里温度和火焰化学产生纳米颗粒。本研究中所遵循的技术步骤将由Li-Mn-O系统中的先前工作以及该系统和Li-Fe-P-O系统的新平衡计算来指导。 前驱体气溶胶的尺寸分布以前被证明是实现纳米级颗粒的重要因素，因此将设计新的气溶胶生成和尺寸细化系统。 此外，将研究在氢/氧扩散火焰颗粒中用Co，Mg，Ni，Al掺杂LiMn 2 O 4，优化合成条件以去除杂质，并对所制备的粉末进行后处理以优化电化学性能（循环性能，放电容量）。 在相关的部分研究中，LiFePO 4颗粒纳米粒子将碳包覆在火焰中，通过冷凝和热解多环芳烃在颗粒表面上。测试电池的电化学性能将通过微分质量分析仪进行颗粒尺寸分离。该研究可能导致新的电池技术，将补充燃料电池在未来十到二十年的远程发电和汽车应用方面的努力。进行研究的学生将有一个独特的进入离子电池技术领域，这是准备成为未来的存储技术。同样，高中和本科生将通过一个外展计划参与。

0928964AxelbaumThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Research under this award aims to develop the needed science for a flame-synthesis process to synthesize nanoparticles of lithium manganese spinel (LiMn2O4) and to extend this process to produce olivine-type lithium iron phosphate (LiFePO4) nanoparticles. Scientific understanding is crucially needed to be able to control particle size, doping and carbon coating. If successful, this work will lead to a low-cost, high-production method for producing high-performance Li-ion battery materials. With the rising need to reduce our dependence on foreign oil and greenhouse gas emissions, this research will enable the use of hybrid electric vehicles and renewable energy.The basic approach is to introduce a fine aerosol of precursors into a premixed or diffusion flame, where temperature and flame chemistry produce the nanoparticles. The technical steps to be followed in this research will be guided by previous work in the Li-Mn-O system and by new equilibrium calculations on that system and the Li-Fe-P-O system. Size distribution of precursor aerosol was previously shown to be an important factor for achieving nanoscale particles, so a new precursor-generation and size-refinement system will be devised. In addition, doping of the LiMn2O4 with Co, Mg, Ni, Al in a hydrogen/oxygen diffusion flame particles will be studied, optimizing the synthesis conditions to remove impurities and post-processing the as-prepared powders to optimize the electrochemical performance (cyclability, discharge capacity). In a related part of the study, LiFePO4 particles nanoparticles will be carbon-coated in the flame by condensation and pyrolysis of polycyclic aromatic hydrocarbons on the surface of the particle. Electrochemical performance in test cells will be performed with particle sizes segregated by a differential mass analyzer.The research could lead to new battery technology that will complement fuel cell efforts toward remote power generation and automotive use for the next ten to twenty years. Students conducting the research will have a unique entry with the area of ion battery technologies, which are poised to be the storage technologies of the future. Likewise, high school and undergraduate students will be engaged through an outreach program.