Double current collector cathode design using mixtures of...

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H - Electricity

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H01M 4/02 (2006.01) H01M 4/06 (2006.01) H01M 4/08 (2006.01) H01M 4/34 (2006.01) H01M 6/16 (2006.01) H01M 6/50 (2006.01) H01M 4/36 (2006.01) H01M 4/48 (2006.01) H01M 4/58 (2006.01) H01M 4/66 (2006.01)

Patent

CA 2363282

A new sandwich cathode design is provided having a first cathode structure of a first cathode active material of a relatively low energy density but of a relatively high rate capability, for example SVO, mixed with a second cathode active material having a relatively high energy density but a relatively low rate capability, for example CF x, with the percentage of SVO being less than that of CF x and sandwiched between two current collectors. Then, a second cathode mixture of SVO and CF x active materials is contacted to the outside of the current collectors. However, the percentage of SVO to CF x is greater in the second structure than in the first. Such an exemplary cathode design might look like: (100-y)% SVO + y% CF x, wherein 0 <= 100/current collector/(100-x)% SVO + x% CF x, wherein 0 <= x <= 100/current collector/(100-y)% SVO + y% CF x, wherein 0 <= y <= 100, and wherein the ratio of x to y is selected from the group consisting of y < x, x < y and x = y.

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