Investigation of solid electrolyte interfacial layer development during continuous cycling using ac impedance spectra and micro-structural analysis |
| |
Authors: | PL Moss G Au EJ Plichta JP Zheng |
| |
Affiliation: | 1. Department of Electrical and Computer Engineering, Florida A&M University and Florida State University, Tallahassee, FL 32310, United States;2. U.S. Army CERDEC, Ft. Monmouth, NJ 07703, United States;3. Center for Advance Power Systems, Florida State University, Tallahassee, FL 32310, United States |
| |
Abstract: | The formation of passivating surface films on the electrodes of a lithium-ion polymer battery was investigated at various cycling state using ac impedance spectroscopy and scanning electron microscopy (SEM). A sealed commercial cell (Sony Co.) with a nominal capacity of 840 mAh was used for the experiment. An equivalent circuit used to model the impedance spectra show that, with continuous cycling there is a relatively large increase in the interfacial impedance and charge transfer resistances after a few hundred charge–discharge cycles. It was observed that the cell capacity decrease with increase cell impedance. SEM analysis on the electrodes shows that during continuous charge–discharge cycling, the deposition of sub-micro-size particles and dissolution of surface films on the graphite surface. This observation is consistent with increase in cell impedance as a function of charge/discharge cycling. |
| |
Keywords: | Solid-electrolyte interfacial layer ac Impedance Cycling performance Lithium polymer battery |
本文献已被 ScienceDirect 等数据库收录! |
|