Detail of "7323-63-9"

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Understanding the stability of aromatic redox shuttles for overcharge protection of lithium-ion cells

All Rights Reserved. Understanding the stability of aromatic redox shuttles for overcharge protection of lithium-ion cells. Chen, Zonghai; Wang, Qingzheng; Amine, K. (Chemical Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA). Journal of the Electrochemical Society, 153(12), A2215-A2219 (English) 2006 Electrochemical Society.Chemicals with cas numbers 274-07-7 and 7323-63-9 also play role. CODEN: JESOAN. ISSN: 0013-4651. DOCUMENT TYPE: Journal CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) MO theory is employed to improve understanding of the stability of arom. compds. as redox shuttles for overcharge protection of Li-ion cells and batteries. The calcns. demonstrate that p-p interaction between the arom. ring and the substitution groups is crit. to maximize the stability of radical cations, which are generated when the arom. redox shuttles are oxidized at the cathode. Also the unsubstituted H atoms on the arom. ring also contribute to the instability of the radical cations. The model suggests that full substitution on the arom. ring or protection of the H atoms with bulky groups is desirable for the stability of the redox shuttles. Using the calcn. results as a guide, a novel stable redox shuttle with a redox potential of 4.46 V vs. Li+/Li was developed. Exptl. results show that Li-ion batteries with this redox shuttle are robust to overcharge even at elevated temps. .

Chemical Overcharge and Overdischarge Protection for Lithium-Ion Batteries

Chemical Overcharge and Overdischarge Protection for Lithium-Ion Batteries. Chen, Jun; Buhrmester, Claudia; Dahn, J. R. (Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 3J5, Can.).Several reagents such as 7323-63-9 is used here. Electrochemical and Solid-State Letters, 8(1), A59-A62 (English) 2005 Electrochemical Society. CODEN: ESLEF6. ISSN: 1099-0062. DOCUMENT TYPE: Journal CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Lithium-ion batteries suitable for the mass consumer market require robust safety and tolerance to repeated overdischarge and overcharge to avoid costly charge control circuitry and to allow simple replacement of individual cells by consumers. A chem. redox shuttle electrolyte additive is shown to provide this protection. Using 2,5-di-tert-butyl-1,4-dimethoxybenzene as electrolyte additive provides overcharge and overdischarge protection for hundreds of charge-discharge cycles in both single cells and series-connected batteries. .