Friday, March 09, 2007

3M patents on lithium ion cathode materials

Further to discussions of lithium ion battery cases involving work of John Goodenough (
here and here), one has lithium ion battery cases involving the work of Jeffrey Dahn, including US 6,964,828.

The background section of the '828 states:

Lithium-ion batteries typically include an anode, an electrolyte, and a cathode that contains lithium in the form of a lithium-transition metal oxide. Examples of transition metal oxides that have been used include cobalt dioxide, nickel dioxide, and manganese dioxide. None of these materials, however, exhibits an optimal combination of high initial capacity, high thermal stability, and good capacity retention after repeated charge-discharge cycling.

There are some references to the Journal of the Electrochemical Society, including Paulsen and Dahn, "O2 Structure Li.sub.2/3 [Ni.sub.1/3 Mn.sub.2/3 ]O.sub.2 : A New Layered Cathode Material for Rechargeable Lithium Batteries," J. Electrochem. Soc., 2000, 147(3):861-868. This journal is a favorite of IPBiz, because it DOES ALLOW third party comments on papers published therein.

There is even a cite to a paper on XRD: Wiles and Young,"A new computer program for Rietveld analysis of X-ray powder diffraction patterns," J. Appl. Cryst., 1981, 14:149-151.

The work of Dahn pertains to cathodes comprising manganese.

From 3M Co. sued companies including Sony Corp., Lenovo Group Inc. and Matsushita Industrial Electric Co., accusing them of infringing patents for rechargeable lithium-ion batteries.


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