Flame-assisted synthesis of Li ion battery materials

火焰辅助合成锂离子电池材料

• 批准号: 0928964
• 负责人: Richard Axelbaum
• 金额: $ 30.08万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-12-01 至 2012-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0928964&HistoricalAwards=false
• 关键词: Flame; assisted; synthesis; Li; ion

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.

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。该奖项的研究旨在发展火焰合成工艺所需的科学，以合成锂锰尖晶石纳米颗粒（LiMn2O4），并扩展该工艺以生产橄榄石型磷酸铁锂（LiFePO4）纳米颗粒。科学的理解对于控制颗粒大小、掺杂和碳涂层至关重要。如果成功，这项工作将为生产高性能锂离子电池材料带来低成本、高产量的方法。随着我们越来越需要减少对外国石油和温室气体排放的依赖，这项研究将使混合动力电动汽车和可再生能源的使用成为可能。基本的方法是将前体微粒气溶胶引入预混或扩散火焰中，在那里温度和火焰化学反应产生纳米颗粒。本研究中要遵循的技术步骤将以Li-Mn-O系统的先前工作以及该系统和Li-Fe-P-O系统的新平衡计算为指导。前驱体气溶胶的尺寸分布已被证明是实现纳米级颗粒的重要因素，因此将设计一种新的前驱体生成和尺寸细化系统。此外，还将研究在氢/氧扩散火焰颗粒中掺杂Co、Mg、Ni、Al等元素，优化合成条件以去除杂质，并对制备的粉末进行后处理以优化其电化学性能（可循环性、放电容量）。在研究的相关部分，LiFePO4颗粒纳米粒子将通过颗粒表面的多环芳烃的凝结和热解在火焰中被碳包覆。电化学性能测试电池将执行与粒度分离的微分质分析仪。这项研究可能会带来新的电池技术，在未来10到20年里，它将补充燃料电池在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的机会，离子电池技术有望成为未来的存储技术。同样，高中生和大学生也将通过外展项目参与其中。