Influence of surface modification of LiCoO2 by organic compounds on electrochemical and thermal properties of Li/LiCoO2 rechargeable cells

LiCoO2 is the most famous positive electrode (cathode) for lithium ion cells. When LiCoO2 is charged at high charge voltages far from 4.2 V, cycleability of LiCoO2 becomes worse. Causes for this deterioration are instability of pure LiCoO2 crystalline structure and an oxidation of electrolyte solutions LiCoO2 at higher charge voltages. This electrolyte oxidation accompanies with the partial reduction of LiCoO2. We think more important factor is the oxidation of electrolyte solutions. In this work, influence of 10 organic compounds on electrochemical and thermal properties of LiCoO2 cells was examined as electrolyte additives.



J. Power Sources.  2011, 196: 2790–2801
http://dx.doi.org/10.1016/j.jpowsour.2010.11.064

A Guide to Li-Ion Coin-Cell Electrode Making for Academic Researchers

"To remain as relevant as possible, academic researchers need to be able to produce electrodes for lithium ion batteries that are comparable to those used in industry. This requires both a high percentage of active material and a high electrode density. Furthermore, the electrodes also need to adhere well enough to the current collecting foil to prevent particle detachment during cycling. While much of the knowledge needed to produce such electrodes is widely known in the industrial sphere, it is not readily available in the academic literature. Now that Li-ion battery technology has matured, reports of materials and cells tested using impractical electrodes are of limited value. This report outlines an effective method for producing high density, high capacity electrodes that have low amounts of binder and carbon black while still possessing excellent adhesion and electrochemical performance."

Journal of The Electrochemical Society. 2011, 158 (1 ), A51-A57

http://jes.ecsdl.org/content/158/1/A51.full.pdf+html