Redox shuttle for rechargeable lithium-ion cell
First Claim
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1. A lithium ion cell electrolyte comprising a charge carrying medium, lithium salt and cyclable redox chemical shuttle comprising 2,5-di-tert-butyl-1,4-dimethoxybenzene.
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Abstract
A redox chemical shuttle comprising an aromatic compound substituted with at least one tertiary carbon organic group and at least one alkoxy group (for example, 2,5-di-tert-butyl-1,4-dimethoxybenzene) provides repeated overcharge protection in rechargeable lithium-ion cells.
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17 Claims
- 1. A lithium ion cell electrolyte comprising a charge carrying medium, lithium salt and cyclable redox chemical shuttle comprising 2,5-di-tert-butyl-1,4-dimethoxybenzene.
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6. A rechargeable lithium-ion cell comprising a negative electrode;
- positive electrode; and
an electrolyte comprising 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 and having an electrochemical potential vs. Li/Li+ that is greater than that of the positive electrode material. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
- positive electrode; and
- 15. A rechargeable lithium-ion cell comprising a negative electrode, positive electrode comprising LiFePO4, electrolyte and a cyclable redox chemical shuttle comprising an aromatic compound substituted with at least one tertiary carbon organic group and at least one alkoxy group and having an electrochemical potential vs. Li/Li+ that is greater than that of LiFePO4.
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