Patent ID: 6030719
Filing Date: 2000-02-29
Classification: H01M,Y02E,Y02P

Abstract:
A lithium ion electrolytic cell comprising:a first electrode and a second electrode, wherein at least one of the first or second electrodes is a carbonaceous electrode having a surface;an electrolyte; anda passivating layer, associated with the surface of the carbonaceous electrode, including at least carbon, lithium and at least one of an additive or the product of the interaction of the additive with the carbonaceous electrode,the passivating layer having a relative thickness index from about 10 to about 90, and a relative lithium ion content index from about 0.1 to about 0.7, as measured by X-ray photoelectron spectroscopy, relative to the carbon and lithium, at a discharged state after at least one electrolytic cell cycling, wherein,the relative thickness index is calculated from the formula: A[C1s(2)]/A[C1s(1)], wherein,A[C1s(1)]=the area under the peak of the measured carbon in the 1 s orbital, and which peak top is between 284.4 and 284.8 eV, andA[C1s(2)]=the total area of all measured peaks for carbon in the 1 s orbital (-) A[C1s(1)]; andthe relative lithium ion content index is calculated from the formula A[Li1s]/A[C1s(2)], wherein,A[Li1s]=the total area of all measured peaks for lithium in the 1s orbital.