| US 7,615,312 B2 | ||
| Substituted phenothiazine redox shuttles for rechargeable lithium-ion cell | ||
| Jeffrey R. Dahn, Hubley (Canada); Claudia Buhrmester, Prospect (Canada); Richard L. Wang, Halifax (Canada); and William M. Lamanna, Stillwater, Minn. (US) | ||
| Assigned to 3M Innovative Properties Company, St. Paul, Minn. (US) | ||
| Filed on May 17, 2005, as Appl. No. 11/130,850. | ||
| Prior Publication US 2006/0263697 A1, Nov. 23, 2006 | ||
| Int. Cl. H01M 4/58 (2006.01) | ||
| U.S. Cl. 429—231.1 [429/221; 429/224; 429/231.95; 429/328; 429/336; 429/330; 429/332; 429/338; 429/342; 429/339; 429/340; 429/50; 29/623.2; 29/623.1] | 17 Claims |
| 1. A rechargeable lithium-ion cell comprising:
(a) a positive electrode having a recharged potential and comprising LiFePO4, Li2FeSiO4, LixMnO2 (where x is about 0.3 to about 0.4), or MnO2;
(b) a negative electrode;
(c) a charge-carrying electrolyte comprising a charge carrying medium comprising a charge carrying medium that includes an
organic carbonate and a lithium salt; and
(d) a cyclable redox chemical shuttle comprising 10-methyl-phenothiazine, 10-ethyl-phenothiazine, 3-chloro-10-ethyl-phenothiazine,
10-isopropyl-phenothiazine, 2-perfluoromethyl-phenothiazine, 10-acetyl-phenothiazine 2-cyano-10-perfluoromethylsulfonyl-phenothiazine,
2-methoxy-10-perfluoromethylsulfonyl-phenothiazine, 2-perfluoromethyl-10-perfluoromethylsulfonyl-phenothiazine, 10-perfluoromethyl-phenothiazine,
10-perfluoromethylsulfonyl-phenothiazine, 10-(1,1,1,2,3,3)-hexafluoropropyl-phenothiazine, or mixtures thereof, wherein
the recharged potential is the potential at which the positive electrode becomes delithiated during the first charge cycle
to a lithium level corresponding to at least 90% of the available recharged cell capacity.
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