▎ 摘　　要

NOVELTY - Lithium ion battery comprises 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. The supplemental lithium is present in an amount to compensate for 110-170 wt.% of the negative electrode first cycle irreversible capacity loss. The silicon based active material generally has a specific capacity from 800-2500 mAh/g at a rate of C/3 when cycled from 1.5V to 0.005V against lithium. The lithium ion battery has a balance of negative electrode capacity relative to the sum of positive electrode capacity and supplemental lithium from 1.1-1.7. USE - Lithium ion battery for consumer electronics. ADVANTAGE - The lithium ion battery has high capacity silicon-based material negative electrode active material that stabilize the negative electrode materials over cycling while maintaining a high specific capacity, and reducing the irreversible capacity loss in the first charge and discharge cycle. DETAILED DESCRIPTION - Lithium ion battery comprises 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. The supplemental lithium is present in an amount to compensate for 110-170 wt.% of the negative electrode first cycle irreversible capacity loss. The silicon based active material generally has a specific capacity from 800-2500 mAh/g at a rate of C/3 when cycled from 1.5V to 0.005V against lithium. The lithium ion battery has a balance of negative electrode capacity relative to the sum of positive electrode capacity and supplemental lithium from 1.1-1.7. 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. The negative electrode has an active material loading from 1.5-8 mg/cm2. The battery exhibits a volumetric energy density at least 550 Watt-hours per litre (Wh/l). DESCRIPTION OF DRAWING(S) - The drawing shows an expanded view of a pouch battery with a battery core separated from two portions of the pouch case. 160Pouch battery 162Pouch enclosure 164Battery core 166Pouch cover 170Cavity 172Edge 174,176Terminal tabs