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US 8,257,864 B2Granted
Method of making tin-based alloys for negative electrode compositions
Assignee3M Innovative Properties Company
InventorsJeffrey R. Dahn, Pierre P. Ferguson, Mark N. Obrovac, Dinh B. Le, James R. Landucci
Life of this patent
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Abstract
Powder milling techniques, tin-based alloys formed thereby, and the use of such alloys as electrode compositions for lithium ion batteries are provided. The alloys include tin and at least one transition metal but contain no silicon. The powder milling is done using low energy roller milling (pebble milling).
Claims17
A method of making nanostructured alloy particles containing substantially no silicon, the method comprising:
- milling a millbase in a pebble mill containing milling media to provide the nanostructured alloy particles, wherein the millbase comprises:
- tin, and at least one of carbon or a transition metal, and wherein the nanostructured alloy particles are substantially free of crystalline domains greater than 50 nanometers in size, wherein the pebble mill has an inside diameter of R in feet, and wherein the pebble mill has a rotational speed of greater than 100 percent of 54.2/R1/2.
A method of making a negative electrode for a lithium-ion electrochemical cell, the method comprising:
- milling a millbase in a pebble mill wherein the millbase includes:
- tin;
- and
- at least one of carbon or a transition metal, wherein the nanostructured alloy particles are substantially free of crystalline domains greater than 50 nanometers in size;
- and
- dispersing the nanostructured alloy particles in a slurry including a polymeric binder;
- and
- coating the slurry onto a metal current collector,
- wherein the pebble mill has an inside diameter of R in feet, and wherein the pebble mill has a rotational speed of greater than 100 percent of 54.2/R1/2.
6 more elements
Dependencies are inferred from the claim text.