The impact of electrode formation is studied by the spatially and time-resolved distribution of transverse relaxation. In situ ⁷Li nuclear magnetic resonance experiments are performed on an experimental lithium-ion battery cell to study the impact of electrode passivation via imaging and transverse relaxation in the interelectrode volume. The electrolyte in the battery, using technically relevant electrode material, i.e., graphite and lithium–nickel–cobalt–manganese–oxide, is studied by 2D magnetic resonance imaging. The electrolyte is 1 mol L⁻¹ lithium hexafluorophosphate dissolved in a binary mixture of ethylene carbonate and dimethyl carbonate. 1D profiles are acquired and related to ⁷Li concentration during passivation and during a constant current/constant voltage cycle. The transverse relaxation rate R₂(z,t) measured by multiecho profiles revealed changes within the electrolyte volume. The ongoing process changes the relaxation distribution. Indications for a defective electrode passivation are deduced from the data. During one charging cycle with constant current/constant voltage, the lithium concentration is measured spatially resolved, and the data are modeled by the Nernst–Planck equation.

中文翻译：

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通过磁共振成像研究横向弛豫率分布：电极形成的影响

通过横向弛豫的空间和时间分辨分布研究电极形成的影响。对实验性锂离子电池进行原位⁷ Li 核磁共振实验，通过成像和电极间体积的横向弛豫来研究电极钝化的影响。电池中的电解质使用技术上相关的电极材料，即石墨和锂-镍-钴-锰-氧化物，通过二维磁共振成像进行研究。电解质是溶解在碳酸亚乙酯和碳酸二甲酯的二元混合物中的1mol L ^-1六氟磷酸锂。获得一维轮廓并与⁷钝化期间和恒流/恒压循环期间的锂浓度。通过多回波剖面测量的横向弛豫率R ₂ ( z , t ) 揭示了电解质体积内的变化。正在进行的过程会改变松弛分布。从数据中推断出有缺陷的电极钝化的迹象。在恒定电流/恒定电压的一个充电周期中，锂浓度在空间上进行测量，数据由 Nernst-Planck 方程建模。