Hierarchical 3D micro/nanostructured LiMn1-xFexPO4/graphene hybrid composite for high power Li-ion battery and its dynamic study by in-situ X-ray absorption and THz spectroscopies

用于高功率锂离子电池的分层3D微/纳米结构LiMn1-xFexPO4/石墨烯杂化复合材料及其原位X射线吸收和太赫兹光谱动态研究

• 批准号: 494159-2016
• 负责人: Sun, Shuhui
• 金额: $ 12.03万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=666208
• 关键词: Hierarchical; 3D; micro; nanostructured; LiMn1

Lithium ion batteries (LIBs) represent an important family of energy storage devices due to their high voltage, high energy density, and good cycling stability. However, as a power source for electric vehicles (EVs) and hybrid EVs, the current LIB technology still needs to be further advanced to improve their power density. ** This Strategic project aims to develop new type of high-performance and cheap cathode materials for high-power and safe LIBs. We propose to focus on one of the most promising cathode materials, i.e. LiMn1-xFexPO4 (LMFP), which provides up to 20% increase in energy density compared with the well-developed LiFePO4. This could offer Canadian cell manufacturers with a competitive advantage by allowing energy storage systems to weigh less and require fewer cells. However, LMFP does have its own challenges, including (i) poor electronic conductivity, and (ii) sluggish Li+ diffusion. Further, deep understanding of the dynamics of Li+ ions and electrons in this new LMFP cathode material is lacking. ** In this project, we will employ nanotechnology to develop a novel hierarchical 3D micro/nanostructured LMFP with graphene coating cathode materials, targeting to solve the above challenges. Equally important is the application of novel terahertz (THz) and synchrotron radiation techniques, and theoretical modeling, to perform unique in situ and ex situ studies of the Li+ and electron dynamics. This would provide significant guidance to design super performance LMFP/graphene cathode materials, giving Canadian companies in the energy sector a competitive advantage. Particularly, THz spectroscopy is a non-contact electrical probe that can measure charge dynamics and photoconductivity on sub-picosecond to nanosecond timescales (temporal resolutions that traditional methods do not have). This would help to make LIBs safe and economically competitive with today's internal combustion engine for EVs. The applicants will work with three Canadian industrial partners for applications in sectors of high socio-economic impact to Canada.********

锂离子电池（LIB）由于其高电压、高能量密度和良好的循环稳定性而代表能量存储装置的重要家族。然而，作为电动汽车（EV）和混合动力汽车的动力源，目前的LIB技术仍需要进一步发展，以提高其功率密度。** 该战略项目旨在为大功率和安全的LIB开发新型高性能和廉价的阴极材料。我们建议专注于最有前途的正极材料之一，即LiMn 1-xFexPO 4（LMFP），与开发良好的LiFePO 4相比，其能量密度增加高达20%。这可以为加拿大电池制造商提供竞争优势，允许储能系统重量更轻，需要更少的电池。然而，LMFP确实具有其自身的挑战，包括（i）差的电子传导性，和（ii）缓慢的Li+扩散。此外，缺乏对这种新型LMFP阴极材料中Li+离子和电子的动力学的深入理解。** 在这个项目中，我们将采用纳米技术开发一种新型的分层3D微/纳米结构的LMFP，石墨烯涂层阴极材料，旨在解决上述挑战。同样重要的是应用新型太赫兹（THz）和同步辐射技术，以及理论建模，对Li+和电子动力学进行独特的原位和非原位研究。这将为设计超性能LMFP/石墨烯阴极材料提供重要指导，使加拿大能源部门的公司具有竞争优势。特别是，太赫兹光谱是一种非接触式电探针，可以在亚皮秒到纳秒的时间尺度上测量电荷动力学和光电导性（传统方法不具备的时间分辨率）。这将有助于使LIB与当今的电动汽车内燃机相比具有安全性和经济性。申请人将与三个加拿大工业合作伙伴合作，在对加拿大具有高度社会经济影响的部门申请。