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首页> 外文会议>AABC tracks 2017: xEV battery technology, application amp; market and chemistry amp; materials for lead-based batteries >Pressure Induced Ionic Transport Limitations in Porous Lithium-Ion Battery Materials
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Pressure Induced Ionic Transport Limitations in Porous Lithium-Ion Battery Materials

机译：多孔锂离子电池材料中的压力诱导离子迁移限制

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摘要

The intercalation and ageing induced volume changes of lithium-ion battery electrodes lead to significant pressure levels on cell and module level. The prevailing mechanical conditions during cycling can lead to heterogeneous electrochemical systems and accelerates the cell ageing. For a deeper understanding of the mechanical-electrochemical coupling, we present a method to quantify the pressure dependent ionic transport in porous lithium-ion battery materials. Therefore a Li-free blocking electrolyte (TBA-PF6) in symmetrical pouch cells with NMC111 cathodes, graphite anodes and PE separator films is used to suppress the Li charge transfer reaction during electrochemical impedance spectroscopy (EIS). The EIS is performed at various mechanical pressures of up to 5 MPa, applied via a compression device which allows force measurement and homogeneous pressure distribution. The rise of the ionic resistance reveals a significant transport limitation at increased pressures, especially for soft anode and separator materials. The reduced transport properties can be linked to the reduction of porosity by compression as well as tortuosity variations.
机译：锂离子电池电极的嵌入和老化引起的体积变化会导致电池和模块水平上的显着压力水平。循环过程中的主要机械条件会导致电化学体系异质化，并加速电池老化。为了更深入地了解机械-电化学耦合，我们提出了一种方法来量化多孔锂离子电池材料中压力相关的离子迁移。因此，在带有NMC111阴极，石墨阳极和PE隔离膜的对称袋式电池中使用无锂的阻挡电解质（TBA-PF6）来抑制电化学阻抗谱（EIS）中的锂电荷转移反应。 EIS在最高5 MPa的各种机械压力下执行，并通过压缩装置施加压力，从而实现力测量和均匀的压力分布。离子电阻的升高揭示了在升高的压力下的显着运输限制，尤其是对于软阳极和隔板材料而言。降低的运输性能可以与通过压缩以及曲折度变化引起的孔隙率降低联系在一起。

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