公开(公告)号：US10822725B2

公开(公告)日：2020-11-03

申请号：US13986223

申请日：2013-04-15

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: D01F9/12 ,  D01D5/14 ,  D01D10/02 ,  C01B32/194 ,  D01D1/02 ,  D01D5/04

Abstract: A unitary graphene-based continuous graphitic fiber comprising at least 90% by weight of graphene planes that are chemically bonded with one another having an inter-planar spacing from 0.3354 to 0.4 nm and an oxygen content of 0.01 to 5% by weight, wherein the graphene planes are parallel to one another and parallel to a fiber axis direction and the graphitic fiber contains no core-shell structure, have no helically arranged graphene domains, and have a porosity level less than 5% by volume. This fiber can be produced by a continuous filament of graphene oxide gel having living graphene oxide molecules or functionalized graphene chains dissolved in a fluid medium. The filament is deposited onto a supporting substrate under a molecule-aligning stress condition along the filament axis direction and then subjected to drying and heating treatments.

公开(公告)号：US10748672B2

公开(公告)日：2020-08-18

申请号：US14120959

申请日：2014-07-17

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: H01B1/04 ,  H01B13/30 ,  C01B32/23 ,  C01B32/184 ,  C01B32/182 ,  C01B32/198

Abstract: A process for producing a solid graphene foam composed of multiple pores and pore walls The process comprises: (a) preparing a graphene dispersion having a graphene material dispersed in a liquid medium, which contains an optional blowing agent; (b) dispensing and depositing the graphene dispersion onto a supporting substrate to form a wet layer of graphene material having a preferred orientation; (c) partially or completely removing the liquid medium from the wet layer of graphene material to form a dried layer of graphene material having a content of non-carbon elements no less than 5% by weight (including blowing agent weight); and (d) heat treating the layer of graphene material at a first heat treatment temperature from 80° C. to 3,200° C. at a desired heating rate sufficient to induce volatile gas molecules from the non-carbon elements or to activate the blowing agent for producing the graphene foam having a density from 0.01 to 1.7 g/cm3 or a specific surface area from 50 to 3,000 m2/g.

公开(公告)号：US10163540B2

公开(公告)日：2018-12-25

申请号：US14757194

申请日：2015-12-03

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: C23C16/00 ,  H01B1/04 ,  C23C14/06 ,  C23C16/26 ,  C23C18/16 ,  C25D5/54 ,  C01B32/184 ,  C01B32/19 ,  C25D3/22 ,  C23C18/40

Abstract: A process for producing a highly conducting film of conductor-bonded graphene sheets that are highly oriented, comprising: (a) preparing a graphene dispersion or graphene oxide (GO) gel; (b) depositing the dispersion or gel onto a supporting solid substrate under a shear stress to form a wet layer; (c) drying the wet layer to form a dried layer having oriented graphene sheets or GO molecules with an inter-planar spacing d002 of 0.4 nm to 1.2 nm; (d) heat treating the dried layer at a temperature from 55° C. to 3,200° C. for a desired length of time to produce a porous graphitic film having pores and constituent graphene sheets or a 3D network of graphene pore walls having an inter-planar spacing d002 less than 0.4 nm; and (e) impregnating the porous graphitic film with a conductor material that bonds the constituent graphene sheets or graphene pore walls to form the conducting film.

公开(公告)号：US10102973B2

公开(公告)日：2018-10-16

申请号：US14121487

申请日：2014-09-12

Applicant: Nanotek Instruments, Inc.

Inventor： Yi-jun Lin ,  Bor Z Jang ,  Shaio-Yen Lee ,  Aruna Zhamu

IPC: H01G4/005 ,  H01G4/228 ,  H01G4/30 ,  H01G4/06 ,  H01G4/008 ,  H01G4/12 ,  C01B31/04 ,  B32B18/00 ,  C04B35/468 ,  C04B35/626 ,  C04B35/634 ,  C04B35/638

Abstract: A ceramic capacitor comprising at least a dielectric ceramic layer and at least a graphene electrode layer deposited on the ceramic layer, wherein the graphene electrode layer has a thickness no less than 2 nm and consists of a graphene material or a graphene composite material containing at least 0.1% by weight of a graphene material dispersed in a matrix material or bonded by a binder material, wherein the graphene material is selected from (a) a plurality of single-layer or multi-layer pristine graphene sheets having less than 0.01% by weight of non-carbon elements, or (b) one or a plurality of a non-pristine graphene material having at least 0.01% by weight of non-carbon elements, wherein the non-pristine graphene is selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, doped graphene, chemically functionalized graphene, or a combination thereof.

公开(公告)号：US09988273B2

公开(公告)日：2018-06-05

申请号：US15240543

申请日：2016-08-18

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: C01B32/182 ,  C01B31/04 ,  C09K5/14 ,  H01B1/04 ,  C07D413/14

CPC classification number: C01B32/20 ,  C01B31/04 ,  C07D413/14 ,  C09K5/14 ,  H01B1/04

Abstract: A process for producing a highly oriented humic acid (HA) film, comprising: (a) preparing a dispersion of HA or chemically functionalized HA (CHA) sheets dispersed in a liquid medium, wherein HA sheets contain an oxygen content higher than 5% by weight or CHA sheets contain non-carbon element content higher than 5% by weight; (b) dispensing and depositing HA or CHA dispersion onto a surface of a supporting substrate to form a wet layer, under an orientation-inducing stress; (c) removing liquid medium from the wet layer to form a dried HA or CHA layer having hexagonal carbon planes and an inter-planar spacing d002 of 0.4 nm to 1.3 nm as determined by X-ray diffraction; and (d) thermally reducing the dried HA or CHA layer at a first heat treatment temperature higher than 80° C. for a sufficient period of time to produce the film containing reduced HA or CHA.

公开(公告)号：US11217792B2

公开(公告)日：2022-01-04

申请号：US15412852

申请日：2017-01-23

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: H01M4/62 ,  H01M4/136 ,  H01M4/04 ,  H01M4/1397 ,  H01M4/36 ,  H01M4/58 ,  H01M4/02

Abstract: A graphene-enhanced transition metal fluoride or chloride hybrid particulate for use as a lithium battery cathode active material, wherein the particulate is formed of a single or a plurality of graphene sheets and a plurality of fine transition metal fluoride or chloride particles with a size smaller than 10 μm (preferably sub-micron or nano-scaled), and the graphene sheets and the particles are mutually bonded or agglomerated into an individual discrete particulate with at least a graphene sheet embracing the transition metal fluoride or chloride particles, and wherein the particulate has an electrical conductivity no less than 10−4 S/cm and the graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the transition metal fluoride or chloride combined.

公开(公告)号：US10418662B2

公开(公告)日：2019-09-17

申请号：US15384749

申请日：2016-12-20

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Hui He ,  Baofei Pan ,  Yu-Sheng Su ,  Bor Z Jang

IPC: H01M10/054 ,  H01M2/16 ,  H01M4/66 ,  H01M4/75 ,  H01M4/80 ,  H01M10/052 ,  H01M10/058 ,  H01M6/16

Abstract: Provided is a cable-shaped alkali metal battery comprising: (a) a first electrode comprising an electrically conductive porous rod having pores and a first mixture of a first electrode active material and a first electrolyte, wherein the first mixture resides in the pores of the porous rod; (b) a porous separator wrapping around the first electrode; (c) a second electrode comprising an electrically conductive porous layer wrapping around or encasing the porous separator, wherein the conductive porous layer contains pores and a second mixture of a second electrode active material and a second electrolyte, and the second mixture resides in the pores of the porous layer; and (d) a protective casing or packing tube wrapping around or encasing the second electrode.

公开(公告)号：US10361460B2

公开(公告)日：2019-07-23

申请号：US14756698

申请日：2015-10-02

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: H01M10/05 ,  H01M10/058 ,  H01M4/131 ,  H01M4/133 ,  H01M4/136 ,  H01M4/48 ,  H01M4/52 ,  H01M4/525 ,  H01M4/58 ,  H01M4/583 ,  H01M4/60 ,  H01M4/66 ,  H01M4/80 ,  H01M6/02 ,  H01M6/14 ,  H01M10/0525 ,  H01M4/13 ,  H01M10/0585 ,  H01M4/38 ,  H01M4/50 ,  H01M4/587

Abstract: A process for producing a lithium battery, comprising: (A) Preparing a plurality of conductive porous layers, wet anode layers, and wet cathode layers; (B) Stacking a desired number of porous layers and wet anode layers in an alternating manner to form an anode electrode having a thickness no less than 100 μm; (C) Placing a porous separator layer in contact with the anode electrode; (D) Stacking a desired number of porous layers wet cathode layers in an alternating manner to form a cathode electrode in contact with the porous separator, wherein the cathode electrode has a thickness no less than 100 μm; and (F) Assembling and sealing the anode electrode, separator, and cathode electrode in a housing to produce the lithium battery. The consolidated anode or cathode layer is preferably thicker than 300 μm more preferably thicker than 400 μm, and further more preferably greater than 500 μm.

公开(公告)号：US20190165364A1

公开(公告)日：2019-05-30

申请号：US15822882

申请日：2017-11-27

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: H01M4/133 ,  H01M4/131 ,  H01M10/0525 ,  C01G33/00 ,  C01B32/182

Abstract: A graphene-enabled hybrid particulate for use as a lithium-ion battery anode active material, wherein the hybrid particulate is formed of a single or a plurality of graphene sheets and a single or a plurality of fine primary particles of a niobium-containing composite metal oxide, having a size from 1 nm to 10 μm, and the graphene sheets and the primary particles are mutually bonded or agglomerated into the hybrid particulate containing an exterior graphene sheet or multiple exterior graphene sheets embracing the primary particles, and wherein the hybrid particulate has an electrical conductivity no less than 10−4 S/cm and said graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the niobium-containing composite metal oxide combined.

公开(公告)号：US10276856B2

公开(公告)日：2019-04-30

申请号：US14756754

申请日：2015-10-08

Applicant: Nanotek Instruments, Inc.

Inventor： Aruna Zhamu ,  Bor Z Jang

IPC: H01M10/052 ,  H01M4/04 ,  H01M10/0525 ,  H01M10/054 ,  H01M10/058 ,  H01M4/80 ,  H01M10/0565 ,  H01M4/139

Abstract: A process for producing an electrode for an alkali metal battery, comprising: (a) Continuously feeding an electrically conductive porous layer to an anode or cathode material impregnation zone, wherein the conductive porous layer has two opposed porous surfaces and contain interconnected conductive pathways and at least 70% by volume of pores; (b) Impregnating a wet anode or cathode active material mixture into the porous layer from at least one of the two porous surfaces to form an anode or cathode electrode, wherein the wet anode or cathode active material mixture contains an anode or cathode active material and an optional conductive additive mixed with a liquid electrolyte; and (c) Supplying at least a protective film to cover the at least one porous surface to form the electrode.