Molten salt electrolyte battery cell with overcharge tolerance
First Claim
1. A lithium alloy battery having a plurality of cells, each with a positive electrode formed of FeS or FeS2, and a negative electrode formed of two lithium alloy phases, one of aluminium and the other of aluminium and iron, with 2 mol % to 50 mol % of the iron in said alloy being substituted with either nickel or cobalt to define the position of the overcharge region in the electro chemical characteristic, a plurality of electrolyte matrices separating said positive and negative electrodes formed of porous magnesium oxide, said electrolyte matrices holding an electrolyte formed of a mixture of potassium bromide, lithium bromide, and lithium chloride.
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Accused Products
Abstract
A molten salt electrolyte battery having an increased overcharge tolerance employs a negative electrode with two lithium alloy phases of different electrochemical potential, one of which allows self-discharge rates which permits battery cell equalization.
14 Citations
11 Claims
- 1. A lithium alloy battery having a plurality of cells, each with a positive electrode formed of FeS or FeS2, and a negative electrode formed of two lithium alloy phases, one of aluminium and the other of aluminium and iron, with 2 mol % to 50 mol % of the iron in said alloy being substituted with either nickel or cobalt to define the position of the overcharge region in the electro chemical characteristic, a plurality of electrolyte matrices separating said positive and negative electrodes formed of porous magnesium oxide, said electrolyte matrices holding an electrolyte formed of a mixture of potassium bromide, lithium bromide, and lithium chloride.
- 5. A method of producing a lithium alloy battery having, improved resistance to destructive overcharging comprising the steps of providing a plurality of serially connected cells, each with a positive electrode formed of FeS or FeS2, and a negative electrode formed of two lithium alloy phases, one of aluminum and the other of aluminum and iron, and substituting with either nickel or cobalt, a proportion of 2 mol % to 50 mol % of the iron in said alloy, to define the electro-chemical level of an overcharge zone at which self-discharge current is approximately equal to trickle charging current.
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11. A method of producing a lithium alloy battery having improved resistance to destructive overcharging, comprising the steps of providing at least one cell with a positive electrode formed of transition metal sulfides and a negative electrode formed of two lithium alloy phases, said two phases being selected with a difference of at least 150 millivolts in electrical activity in the minus 300 millivolts to 0 millivolts relative to α
- Al+β
LiAl reference, and electrolyte having at least 62 mol % lithium cations.
- Al+β
Specification