Rechargeable batteries
First Claim
1. An anode for use in electrochemical cells, which is an alloy of 2 to 30% lithium and other elements, containing at least 20% aluminum and at least 5% magnesium, the composition of the alloy being such that during charge and discharge of the cell, the curve of open circuit voltage as well as the voltage under working conditions versus lithium content of the anode is of a gradually sloping nature, said alloy remaining during charge and discharge in an intermediate phase range or in the variostoichimetric range, said anode containing from zero to 5% of elements selected from the group consisting of:
- Cd, Zn, Sn, Pb, Si, In, Ga, Hg and Sb,the total of these elements not to exceed 40%; and
from zero to 3% of elements selected form the group consisting of;
As, P, Si, Ge, C, Fe, Ni, Cu, CR, V, Co, Zn, Mo, Nb, and Mn,the total of these elements not to exceed a total of 20%, the slope being larger than 3 mV per 1 per cent change of the lithium content of the anode.
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Accused Products
Abstract
There are provided novel anodes for lithium alloy electrochemical cells, and cells based on such anodes. The alloys used comprise one or more active metals which leaves or leave the anode matrix during discharge of the cell, with the alloy remaining in an intermediate variostoichiometric range during both charge and discharge of the cell. The curve of open circuit voltage as well as working condition voltage versus lithium content of the anode slopes, with no appreciable plateau. A specific embodiment relates to such anodes with a solid polymer electrolyte containing a suitable polymer. Another embodiment refers to porous electrodes made by sintering an alloy powder with a binder.
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Citations
10 Claims
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1. An anode for use in electrochemical cells, which is an alloy of 2 to 30% lithium and other elements, containing at least 20% aluminum and at least 5% magnesium, the composition of the alloy being such that during charge and discharge of the cell, the curve of open circuit voltage as well as the voltage under working conditions versus lithium content of the anode is of a gradually sloping nature, said alloy remaining during charge and discharge in an intermediate phase range or in the variostoichimetric range, said anode containing from zero to 5% of elements selected from the group consisting of:
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Cd, Zn, Sn, Pb, Si, In, Ga, Hg and Sb, the total of these elements not to exceed 40%; and
from zero to 3% of elements selected form the group consisting of;As, P, Si, Ge, C, Fe, Ni, Cu, CR, V, Co, Zn, Mo, Nb, and Mn, the total of these elements not to exceed a total of 20%, the slope being larger than 3 mV per 1 per cent change of the lithium content of the anode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification