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文献报告

文献报告. 马苓 2012.8.26. Degradation Mechanism and Life Prediction of Lithium-Ion Batteries. 内部阻抗影响很小，放电截止电压较低 2.5V 图 2 ，在放电结束时电压迅速下降. Increase of internal resistance. 由图得，随着储存时间增长，储存温度 升高而内部阻抗变 大. Thickness of the SEI layer. 储存时间越长， SEI 膜厚度增加，容量保持率降低. Amount of Mn on the carbon.

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文献报告

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  1. 文献报告 马苓 2012.8.26

  2. Degradation Mechanism and Life Predictionof Lithium-Ion Batteries • 内部阻抗影响很小，放电截止电压较低2.5V • 图2，在放电结束时电压迅速下降

  3. Increase of internal resistance • 由图得，随着储存时间增长，储存温度升高而内部阻抗变大

  4. Thickness of the SEI layer

  5. 储存时间越长，SEI膜厚度增加，容量保持率降低储存时间越长，SEI膜厚度增加，容量保持率降低

  6. Amount of Mn on the carbon • 负极C上Mn含量增多时容量衰减更严重。 • 由图5得，SEI和电解质的界面上Mn含量较大，负极上的Mn并不影响SEI膜的生长，不影响Li的消耗

  7. SEI膜的生长会引起容量的衰减。容量衰减速率可通过SEI膜生长速率来估计。SEI膜的生长会引起容量的衰减。容量衰减速率可通过SEI膜生长速率来估计。 • 负极表面SEI膜的形成包括3个过程（1）SEI膜中电解质由电解质相向负极C表面的扩散（2）锂离子向负极表面的扩散（3）电解质与锂离子的反应

  8. D遵循阿伦尼乌斯定律

  9. 负极C的比表面积越小，容量衰减越少 • 从方程4也可预测：负极C的比表面积越低，容量衰减越少。图15说明了此问题，由方程7得此预测曲线

  10. 高温储存后欧姆阻抗由1.7增大到2.4，电子转移阻抗由2增大到3.4.。故电子转移阻抗是不能忽略的高温储存后欧姆阻抗由1.7增大到2.4，电子转移阻抗由2增大到3.4.。故电子转移阻抗是不能忽略的 • 电池阻抗主要由负极阻抗决定，但是正极阻抗的影响不能忽略

  11. The End!

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