Dynamic impact of LiCoO2 electrodes for Li-ion battery aging evaluation
By Adams, Ryan A.; Li, Bing; Kazmi, Jafr; Adams, Thomas E.; Tomar, Vikas; Pol, Vilas G.
Published in Electrochimica Acta
2018
Abstract
As Li-ion batteries (LIBs) see increasing usage for electric vehicles, the effect of transportation history on battery state-of-health remains unclear. In particular, the influence of dynamic impact on battery behavior is investigated in terms of its effect on battery aging. Standard LiCoO2 electrodes were dynamically impacted using a nano-impactor setup, and the relationship between impact cycle number (N = 0, 3, 12, and 1000) and electrochemical performance is studied. Li-ion half cells constructed from impacted electrodes display decreasing first cycle Coulombic and energy efficiency with number of impacts, with electrochemical impedance spectroscopy analysis revealing an increase in the charge-transfer resistance. Accelerated capacity fading through long-term cycling is observed for N = 1000 impacts, with significant voltage hysteresis and decay occurring by cycle 50. Additional ex-situ material characterization of cycled electrodes reveals a negative Raman shift by ?2