US 9,312,537 B2 · Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

Abstract

A method for modifying graphite particles having a prismatic shape or a cylindrical shape characterized by an edge function fe and a basal function fb, said method providing increase of the edge function and lowering of the basal function, wherein the method includes submitting the graphite particles to at least one physical means selected from attrition, jet mill, ball mill, hammer mill, or atomizer mill, in the presence of at least one chemical compound chosen from the group of compounds of the formula MFz, in which M represents an alkaline or alkaline-earth metal and z represents 1 or 2, NaCl and NH4F or a mixture thereof, said compound or compounds being added in solid form, at the beginning of the step using the physical means.

Claims15

Dependent claims

A method for modifying a shape of graphite particles comprising:

preparing a composition comprising graphite particles to be modified and at least one chemical compound chosen from the group consisting of compounds of the formula MF2, in which M represents an alkaline or alkaline-earth metal and z represents 1 or 2, NaCl and NH4F or a mixture thereof, and
subjecting the composition to at least one of grinding by attrition, jet milling, ball milling, hammer milling, or atomizer milling, to form modified graphite particles;
wherein the modified graphite particles have at least one of:
a tap density between 0.3 and 1.5 g/cc;
a granulometric dispersion, such that a D90/D10 ratio varies between 2.2 and 4.2 and the modified graphite particles have a size between 2 and 30 μm;
and
particles of NaCl and/or of NH4F attached to a surface thereof;
the particles of NaCl and/or of NH4F representing 1 to 10%, of total weight of the modified graphite particles.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/617,084Filed 14 Sep 2012 · continuation

Priority

CA 232443125 Oct 2000

Published

US 2013/0011554 A110 Jan 2013

Granted

12 Apr 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification43 codes

H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
B01J 20/3204
Characterised by the carrier, support or substrate used for impregnation or coating: inorganic carriers, supports or substrates
B01J 20/3236
Inorganic material layers: containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
B01J 20/3293
Characterised by the shape of the carrier, the coating or the obtained coated product: coatings on a core, the core being particle or fiber…

Family

PCT/CA01/01511Parent of this continuation · filed 24 Oct 2001

Application11/606,231Parent of this continuation · filed 30 Nov 2006

Application12/572,510Parent of this continuation · filed 2 Oct 2009

US 2013/0011554 A1Pre-grant publication · published 10 Jan 2013

Application10/381,843Parent of this continuation

US 2004/0053050 A1Published application

US 2007/0071669 A1Published application

US 2010/0092808 A1Published application

US 9,444,092 B2Related patent

US 9,312,537 B2This patent

From the US filing history. Foreign family members aren’t listed.

Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

Life of this patent

Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

Life of this patent

Abstract

Claims15