Abstract
LiNi0.8Co0.2O2 particles from high-power lithium-ion cells were examined to determine material changes that result from accelerated aging tests. X-ray absorption spectroscopy (XAS) and transmission electron microscope (TEM) data indicated a LixNil-xO-type layer on the particle surfaces. The greater thickness on particles from high-power fade cells indicate that these surface layers are a significant contributor to cathode impedance rise observed during cell tests.
| Original language | English |
|---|---|
| Pages (from-to) | 620-625 |
| Number of pages | 6 |
| Journal | Electrochemistry Communications |
| Volume | 4 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2002 |
Funding
This work was supported by the US Department of Energy, Office of Advanced Automotive Technologies, under contract No. W-31-109-ENG-38. The Center for Microanalysis of Materials at the University of Illinois is partially supported by the US Department of Energy under grant DEFG02-96-ER45439. The authors are grateful to D. Fischer and A. Moodenbaugh for help with the soft X-ray measurements and acknowledge fruitful discussions with Mike Thackeray, Ernie Sammann and other colleagues.
Keywords
- Bulk
- Electron microscopy
- LiNiCoO
- Lithium-ion
- Surface