Long life lithium batteries with stabilized electrodes
First Claim
Patent Images
1. A non-aqueous electrolyte comprising:
- an alkali metal salt that is LiClO4, LiBF4, LiAsF6, LiPF6, LiCF3SO3, Li(CF3SO2)2N, Li(CF3SO2)3C, LiN(SO2C2F5)2, lithium alkyl fluorophosphates, or a mixture of any two or more thereof;
a polar aprotic solvent;
a first additive that is a substituted or unsubstituted organoamine selected from the group consisting of pyridazine, vinyl pyridazine, quinoline, vinyl quinoline, pyridine, vinyl pyridine, indole, vinyl indole, triethanolamine, imidazole, vinyl imidazole, piperidine, vinyl piperidine, pyrimidine, vinyl pyrimidine, pyrazine, vinyl pyrazine, isoquinoline, vinyl isoquinoline, quinoxaline, vinyl quinoxaline, N-methylpyrrole, and a mixture of any two or more thereof; and
Li(C2O4)BF2.
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Abstract
The present invention relates to non-aqueous electrolytes having stabilization additives and electrochemical devices containing the same. Thus the present invention provides electrolytes containing an alkali metal salt, a polar aprotic solvent, a first additive that is a substituted or unsubstituted organoamine, substituted or unsubstituted alkane, substituted or unsubstituted alkene, or substituted or unsubstituted aryl compound, and/or a second additive that is a metal (chelato)borate. When used in electrochemical devices with, e.g., lithium manganese oxide spinel electrodes, the new electrolytes provide batteries with improved calendar and cycle life.
46 Citations
16 Claims
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1. A non-aqueous electrolyte comprising:
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an alkali metal salt that is LiClO4, LiBF4, LiAsF6, LiPF6, LiCF3SO3, Li(CF3SO2)2N, Li(CF3SO2)3C, LiN(SO2C2F5)2, lithium alkyl fluorophosphates, or a mixture of any two or more thereof; a polar aprotic solvent; a first additive that is a substituted or unsubstituted organoamine selected from the group consisting of pyridazine, vinyl pyridazine, quinoline, vinyl quinoline, pyridine, vinyl pyridine, indole, vinyl indole, triethanolamine, imidazole, vinyl imidazole, piperidine, vinyl piperidine, pyrimidine, vinyl pyrimidine, pyrazine, vinyl pyrazine, isoquinoline, vinyl isoquinoline, quinoxaline, vinyl quinoxaline, N-methylpyrrole, and a mixture of any two or more thereof; and Li(C2O4)BF2. - View Dependent Claims (2, 3)
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4. A non-aqueous electrolyte comprising:
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an alkali metal salt; a polar aprotic solvent; and a first additive that is a substituted or unsubstituted unsaturated organoamine; a second additive that is Li(C2O4)BF2. - View Dependent Claims (5, 6, 7, 8, 9)
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10. An electrochemical device comprising:
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a cathode; an anode; and an electrolyte comprising an alkali metal salt; a polar aprotic solvent; a first additive that is a substituted or unsubstituted organoamine selected from the group consisting of pyridazine, vinyl pyridazine, quinoline, vinyl quinoline, pyridine, vinyl pyridine, indole, vinyl indole, triethanolamine, imidazole, vinyl imidazole, piperidine, vinyl piperidine, pyrimidine, vinyl pyrimidine, pyrazine, vinyl pyrazine, isoquinoline, vinyl isoquinoline, quinoxaline, vinyl quinoxaline, N-methylpyrrole, and a mixture of any two or more thereof; and a second additive that is Li(C2O4)BF2. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification