Lithium ion batteries with high capacity anode active material and good cycling for consumer electronics
AssigneeZenlabs Energy, Inc.
InventorsShabab Amiruddin, Bing Li, Swapnil J. Dalavi, Sujeet Kumar
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Abstract
Battery designs are provided that exhibit commercially suitable cycling properties for consumer electronics with silicon based active materials in the electrodes. The batteries can have stacked or wound electrodes and suitable electrode designs.
Claims24
A lithium ion battery comprising a positive electrode comprising lithium cobalt oxide, a negative electrode comprising a silicon based active material, a separator between the positive electrode and the negative electrode, supplemental lithium and an electrolyte comprising lithium ions, wherein the supplemental lithium is present in an amount to compensate for 110% to 170% of the negative electrode first cycle irreversible capacity loss, wherein the silicon based active material generally has a specific capacity from 800 mAh/g to 2500 mAh/g at a rate of C/3 when cycled from 1.5V to 0.005V against lithium, wherein the lithium ion battery has a balance of negative electrode capacity relative to the sum of positive electrode capacity and supplemental lithium from 1.1 to 1.7 and wherein the lithium ion battery has a 150th cycle discharge capacity at a discharge rate of C/3 discharged from 4.35V to 2.75V that is at least 80% of the 5th cycle discharge capacity at a discharge rate of C/3 discharged from 4.35V to 2.75V, and wherein the negative electrode has an active material loading from 1.5 mg/cm2 to 8 mg/cm2 wherein the battery exhibits a volumetric energy density at least 550 Wh/l.
A lithium ion battery comprising a positive electrode comprising a lithium metal oxide, a negative electrode, a separator between the positive electrode and the negative electrode, and an electrolyte comprising lithium ions, wherein supplemental lithium is in an amount to compensate for 110% to 170% of the negative electrode first cycle irreversible capacity loss, wherein the negative electrode comprises a physical blend of a silicon based active material, and a distinct graphitic carbon active material with graphitic carbon being 30 wt % to 60 wt % of the active material of the negative electrode, and wherein the lithium ion battery has a 150th cycle discharge capacity at a discharge rate of C/3 discharged from 4.35V to 2.75V that is at least 80% of the 5th cycle discharge capacity at a discharge rate of C/3 discharged from 4.35V to 2.75V.
Dependencies are inferred from the claim text.