Lithium cell and method of forming same
AssigneeTadiran Batteries Ltd.
InventorsYamin Herzel, Chen Menachem, Dany Bar-Tov
Life of this patent
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Abstract
High capacity primary and rechargeable cells may include a cathode with a lithiated active cathode material and an anode including lithium intercalating carbonaceous material. The cells may also include a separator impregnated with a liquid electrolyte or a solid electrolyte. The ratio of the capacity to reversibly incorporate lithium ions of the cathode to the capacity to reversibly incorporate lithium ions in the form of LiC6 of the carbonaceous material of the anode is equal to or larger than 2:1. During charging a high grade high density substantially non-dendritic lithium metal layer is plated on the anode.
Claims21
An electrochemical cell comprising:
- an anode comprising a carbonaceous material, said carbonaceous material is capable of reversibly incorporating lithium ions therein and lithium metal on the surface thereof;
- a cathode capable of reversibly incorporating therein lithium ions;
- and
- a non-aqueous electrolyte in contact with said anode and said cathode;
- wherein the ratio of the capacity to reversibly incorporate lithium ions of said cathode to the capacity to reversibly incorporate lithium ions in the form of LiC6 of said carbonaceous material of said anode is equal to or larger than 2:1.
The cell according to claim I wherein said cathode comprises a lithiated transition metal intercalation active material.
An electrochemical cell comprising:
- an anode comprising an electrically conducting support member and a carbonaceous material attached to said support member, said carbonaceous material is capable of reversibly incorporating lithium ions therein and lithium metal on the surface thereof;
- a cathode capable of reversibly incorporating therein lithium ions;
- and
- a non-aqueous electrolyte in contact with said anode and said cathode;
- wherein prior to charging said cell, said cathode is lithiated by an amount of lithium ions that is equal to or larger than twice the capacity of said carbonaceous material of said anode to intercalate therein lithium ions in the form of LiC6.
A method for constructing an electrochemical cell, the method comprising the steps of:
- providing an anode comprising an electrically conducting support member and a carbonaceous material attached to said support member, said carbonaceous material is capable of reversibly incorporating lithium ions therein and lithium metal on the surface thereof;
- providing a cathode capable of reversibly incorporating therein lithium ions, the ratio of the reversible capacity to incorporate lithium ions of said cathode to the reversible capacity for incorporating lithium ions in the form of LiC6 of said carbonaceous material of said anode is equal to or larger than 2:1;
- providing a non-aqueous electrolyte;
- and
- assembling said cathode, said anode and said electrolyte in a housing to obtain said electrochemical cell.
A method for constructing an electrochemical cell, the method comprising the steps of:
- providing an anode comprising a carbonaceous material attached to a support member, said carbonaceous material is capable of reversibly incorporating lithium ions therein and lithium metal on the surface thereof;
- providing a cathode capable of reversibly intercalating therein lithium ions wherein in the cell's discharged state said cathode is lithiated by an amount of lithium ions that is equal to or larger than twice the capacity of said carbonaceous material of said anode to intercalate therein lithium ions in the form of LiC6;
- providing a non-aqueous electrolyte;
- assembling said cathode, said anode and said electrolyte in a housing to obtain said electrochemical cell.
Dependencies are inferred from the claim text.