In-situ X-ray diffraction studies on lithium-ion battery cathodes
Understanding the intercalation process and the associated structural changes of lithium-ion cathodes is an important area of research for improvement of Li-ion batteries. The coupling of electrochemical measurements obtained by cyclic and linear sweep voltammetry (CV, LSV) and structural data such as X-Ray Diffraction (XRD) can serve as a powerful means of understanding battery cathode materials during cycling. This coupling is most effective when structural (XRD) and electrochemical (CV) data are obtained on a battery simultaneously. This in-situ type analysis improves data interpretation by (1) reducing sample-to-sample variability, (2) accurately correlating XRD and CV results, and (3) obtaining results on battery materials under actual operating conditions. The authors have previously demonstrated a simple coffee-bag cell design for in-situ analysis of battery anodes (such as graphite) and cathodes (such as LiMn{sub 2}O{sub 4}). In this paper they present the use of this in-situ cell for analysis of the layered-type compound LiN{sub 0.8}Co{sub 0.2}O{sub 2} and compare its structural and electrochemical behavior to that of the LiNiO{sub 2} compound. They have performed in-situ analysis on other, similar cathode materials such as LiCoO{sub 2} and Li{sub 8}Ni{sub 5}MnO{sub 16}, however, due to space limitations only the results for the LiNi{sub 0.8}Co{sub 0.2}O{sub 2} phase will be presented here.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 20086865
- Country of Publication:
- United States
- Language:
- English
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