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首页> 外文期刊>Journal of power sources >Electrode structure analysis and surface characterization for lithium-ion cells simulated low-Earth-orbit satellite operation I. Electrochemical behavior and structure analysis
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Electrode structure analysis and surface characterization for lithium-ion cells simulated low-Earth-orbit satellite operation I. Electrochemical behavior and structure analysis

机译：锂离子电池模拟低地球轨道卫星运行的电极结构分析和表面表征I.电化学行为和结构分析

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摘要

Lithium-ion cells for satellite applications operate under a special condition, and are expected to behave differently from those for commercial purposes. To understand the performance-degradation mechanism of lithium-ion cells experienced cycle-life testing in a simulated low-Earth-orbit (LEO) satellite operation, we conducted the structure analysis and surface characterization of the aged LiCoO_2 cathode and graphite anode obtained from a lithium-ion cell with 4350-cycle LEO simulation experience. The analysis results were compared with a fresh cell which served as control. This paper provides a review of testing results on electrochemical and structure analysis. The capacity-verification and impedance measure results indicated that the LiCoO_2 cathode, rather than graphite anode, was responsible for the performance degradation of the aged cell. This conclusion was confirmed by the structure analysis. The qualitative analysis of the XRD spectra disclosed that the aged cathode exhibited a much larger structure change than the aged anode. We also detected the lithium ions that were irreversibly reserved in graphite anode in XRD and ~7Li nuclear magnetic resonance (NMR) analysis of aged graphite anode. These results lead us to deduce that the serious structure change in LiCoO_2 cathode was primarily responsible for the performance degradation of the aged cell.
机译：用于卫星应用的锂离子电池在特殊条件下运行，并且有望表现出与商业用途不同的性能。为了了解锂离子电池在模拟的低地球轨道（LEO）卫星运行中经历的循环寿命测试的性能退化机理，我们对由LiCoO_2阴极和石墨阳极制成的老化LiCoO_2阴极和石墨阳极进行了结构分析和表面表征。锂离子电池具有4350次LEO仿真经验。将分析结果与用作对照的新鲜细胞进行比较。本文综述了电化学和结构分析的测试结果。容量验证和阻抗测量结果表明，LiCoO_2阴极而不是石墨阳极是导致老化电池性能下降的原因。结构分析证实了这一结论。 XRD光谱的定性分析显示，老化的阴极比老化的阳极表现出大得多的结构变化。我们还检测了XRD中不可逆地保留在石墨阳极中的锂离子，以及老化的石墨阳极的〜7Li核磁共振（NMR）分析。这些结果使我们推断出LiCoO_2阴极的严重结构变化是造成老化电池性能下降的主要原因。

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