Dahn's 2,5-di-tert-butyl-1,4-dimethoxybenzene patent

http://www.google.com/patents?id=EYaVAAAAEBAJ&printsec=frontcover&dq=Redox+shuttles+for+high+voltage+cathodes&source=bl&ots=eMYfFrnM5a&sig=wd70Otm0sspe242rxxr24UG9Zhw&hl=en&sa=X&ei=2GQ_UMrOGoeq2gX6i4G4DQ&ved=0CDsQ6AEwBA

1. A lithium ion cell electrolyte comprising a charge carrying medium, lithium salt and cyclable redox chemical shuttle comprising an aromatic compound substituted with at least one tertiary carbon organic group and at least one alkoxy group.
2. An electrolyte according to claim 1 wherein the charge carrying medium comprises ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, dimethoxyethane or combination thereof and the lithium salt comprises LiPF6, lithium bis(oxalato)borate or combination thereof.
3. An electrolyte according to claim 1 wherein the aromatic compound has a single organic ring.
4. An electrolyte according to claim 1 wherein the aromatic compound is substituted with two tertiary carbon groups, each tertiary carbon group independently having up to 12 carbon atoms.
5. An electrolyte according to claim 1 wherein the tertiary carbon group is tert-butyl.
6. An electrolyte according to claim 1 wherein the aromatic compound is substituted with two alkoxy groups, each alkoxy group independently having up to 10 carbon atoms.
7. An electrolyte according to claim 1 wherein the aromatic compound comprises 2,5-di-tert-butyl- 1 ,4-dimethoxybenzene.