Electrocrystallized lithuim metal, method for producing the same, and lithium secondary battery
First Claim
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1. Crystalline metal lithium having a polygonal surface shape deposited on a cathode metal substrate by electrolysis of a lithium ion-conductive non-aqueous liquid electrolyte.
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Abstract
A non-aqueous electrolyte secondary battery having a long cycle life and a high reliability with substantially no internal short-circuit is provided by incorporating crystalline metal lithium as its negative electrode. The crystalline metal lithium is electrochemically deposited on a metal substrate in an electrolyte including a tetrahydrofran derivative or a 1,3-dioxolan derivative as a solvent.
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Citations
16 Claims
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1. Crystalline metal lithium having a polygonal surface shape deposited on a cathode metal substrate by electrolysis of a lithium ion-conductive non-aqueous liquid electrolyte.
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2. A method for producing crystalline metal lithium with a polygonal surface shape consisting of the steps of:
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disposing in opposition to each other a metal substrate as a cathode and an ion source as an anode that electrochemically frees lithium ions, in a lithium ion-conductive non-aqueous liquid electrolyte including, as its solvent, at least one member selected from the group consisting of tetrahydrofuran derivatives represented by the formula;
##STR3## wherein R1 =Cm H2m+1, and R2 =Cn H2n+1, and m and n do not represent 0 at the same time and 1,3-dioxolan derivatives represented by the formula;
. ##STR4## wherein R1 =Cm H2m+m, and R2 =Cn H2n+1, and m and n do not represent 0 at the same time, andpassing a cathode current through said metal substrate to deposit lithium with a polygonal surface shape on said metal substrate. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A non-aqueous liquid electrolyte lithium secondary battery comprising:
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a rechargeable positive electrode, a negative electrode consisting of metal lithium with a polygonal surface shape deposited on a metal substrate by electrolysis of a lithium ion-conductive non-aqueous liquid electrolyte, and a lithium ion-conductive non-aqueous liquid electrolyte. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification