Diagnosing Li Ion Battery Health with Nonlinear Frequency Response Analysis

摘要

1. Knowing the state of health essential for safe and high performance operation of Li ion batteries 2. Quantification of single degradation processes advantageous 3. Classical methods often slow (e.g. ICA, disch.) or limited discrimination (R, C_(Ah)) 4. Electrochemical Impedance Spectroscopy holds potential for fast online analysis, but still limited insight: a. loss of nonlinear information (surface reactions/changes) b. no discrimination between lin. and nonlin. (kinetic) processes c. non-unique attribution (of changes) to processes.