Graphite or carbon particulates for the lithium ion battery anode
AssigneeNanotek Instruments, Inc.
InventorsAruna Zhamu, Jinjun Shi, Guorong Chen, Qing Fang, Bor Z. Jang, Ming C. Wang
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AssigneeNanotek Instruments, Inc.
InventorsAruna Zhamu, Jinjun Shi, Guorong Chen, Qing Fang, Bor Z. Jang, Ming C. Wang
Estimating the term…
This invention provides a graphite or graphite-carbon particulate for use as a lithium secondary battery anode material having a high-rate capability. The particulate is formed of a core carbon or graphite particle and a plurality of satellite carbon or graphite particles that are each separately bonded to the core particle wherein the core particle is spherical in shape, slightly elongate in shape with a major axis-to-minor axis ratio less than 2, or fibril in shape, and wherein the satellite particles are disc-, platelet-, or flake-like particles each containing a graphite crystallite with a crystallographic c-axis dimension Lc and a lateral dimension. Preferably, Lc is less than 100 nm and the flake/platelet lateral dimension is less than 1 μm. The core particle may be selected from natural graphite, artificial graphite, spherical graphite, graphitic coke, meso-carbon micro-bead, soft carbon, hard carbon, graphitic fibril, carbon nano-fiber, carbon fiber, or graphite fiber. Preferably, the flat-shaped particles are randomly oriented with respect to one another.
A graphite or combined graphite-carbon particulate for forming a lithium secondary battery anode material, said particulate consists of an orientation-controlling core particle of carbon or graphite and a plurality of satellite carbon or graphite particles that are each separately bonded or attached to said core particle at a surface of said core particle, wherein the core particle is spherical or ellipsoidal in shape with a major axis-to-minor axis ratio less than 2, or a fibril shape having a diameter from 200 nm to 5 μm, wherein said satellite particles are flat-shaped, disc-, platelet-, or flake-like particles having a thickness less than 100 nm and a lateral dimension less than 1 μm that are selected from nano graphene platelets, graphite oxide, or graphite fluoride each consisting of a graphite crystallite having a preferred orientation defined by a crystallographic c-axis, wherein said satellite particles are single-crystal structures that are randomly oriented with respect to one another for the purpose of increasing power capability of said particulate, and wherein said satellite particles are bonded to said core particle using a conductive binder selected from an amorphous carbon, a polymeric carbon, a pitch, petroleum pitch, coal tar pitch, meso-phase pitch, coke, a conductive organic or polymer, or a combination thereof.
A graphite or combined graphite-carbon particulate for forming a lithium secondary battery anode material, said particulate is non-porous and is formed of an orientation-controlling core particle or portion of graphite or carbon that is spherical, spheroidal, or ellipsoidal in shape, and a plurality of flat-shaped satellite or perimeter portions of graphite that are integral with said core particle or portion, wherein said satellite or perimeter portions of graphite are single-crystal structures, and wherein the particulate is spherical in shape or ellipsoidal in shape with a major axis-to-minor axis ratio less than 2, or a fibril shape having a diameter from 200 nm to 5 μm, and said flat-shaped satellite portion consists of nano graphene platelets, graphite oxide, or graphite fluoride having a preferred orientation defined by a crystallographic c-axis thereof and wherein said plurality of flat-shaped satellite or perimeter portions of graphite are randomly oriented with respect to one another for the purpose of increasing power capability of said particulate, and said flat-shaped satellite portion consists of nano graphene platelets, graphite oxide, or graphite fluoride having a thickness less than 100 nm and a lateral dimension less than 1 μm.
Dependencies are inferred from the claim text.