LITHIUM ION BATTERIES WITH HIGH CAPACITY ANODE ACTIVE MATERIAL AND GOOD CYCLING FOR CONSUMER ELECTRONICS

摘要

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.

主权项

1. A lithium ion battery having a volume from about 500 mm3 to about 100,000 mm3 and comprising a positive electrode comprising a lithium metal 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 provided in an amount to compensate for about 100% to about 170% of the negative electrode first cycle irreversible capacity loss, wherein the positive electrode has a loading from about 10 mg/cm2 to about 40 mg/cm2 and a density of active material from about 2.5 g/cc to about 4.6 g/cc, and wherein the negative electrode has a loading from about 1.5 mg/cm2 to about 8 mg/cm2 and a density from about 0.5 g/cc to about 2.0 g/cc.