公开(公告)号：US20220320487A1

公开(公告)日：2022-10-06

申请号：US17713973

申请日：2022-04-05

申请人： University of North Texas

发明人： Wonbong Choi ,  Sanket Bhoyate

IPC分类号： H01M4/139 ,  H01M10/052 ,  H01M4/66 ,  H01M10/0562 ,  H01M4/04 ,  H01M4/62 ,  H01M4/36

摘要： Hybrid electrolyte-catalyst structures including a catalyst material, a solid state electrolyte (SSE) material, and a liquid electrolyte material deposited to form coating layer(s) on carbon materials (e.g., carbon nanotubes) prevent polysulfide shuttling, improve ion flow, and enhance utilization of active materials in lithium-sulfur batteries. For example, a solution including the catalyst material and the solid state electrolyte material may be drop casted on a carbon material or the catalyst material and the solid state electrolyte material may be deposited on the carbon material using a co-sputtering process. The liquid electrolyte material may be deposited on the solid state electrolyte-catalyst coated carbon material to form the hybrid electrolyte-catalyst coating layer(s). Coating a carbon substrate with the hybrid electrolyte-catalysts coating layer(s) can suppress polysulfide shuttling by catalyzing polysulfide reactions. Additionally, the coating layer(s) exhibit synergistic effects of accelerated and uniformly distributed ion flow for use as a carbon nanotube (CNT)-S cathode.

公开(公告)号：US10727004B2

公开(公告)日：2020-07-28

申请号：US16091474

申请日：2017-04-07

申请人： UNIVERSITY OF NORTH TEXAS

发明人： Wonbong Choi

IPC分类号： H01G11/86 ,  C01G39/06 ,  H01G11/30 ,  B32B15/04 ,  H01G4/33 ,  H01G4/08 ,  C23C14/14 ,  C23C14/35 ,  C23C16/30 ,  H01G11/28 ,  H01L21/285 ,  H01L21/306 ,  H01L29/40 ,  H01L29/45 ,  H01L29/66

摘要： The invention includes supercapacitors and methods of making supercapacitor by fabricating transition metal dichalcogenide (MX2) layers using a combination of magnetron sputtering followed by chemical vapor deposition.

公开(公告)号：US20160093491A1

公开(公告)日：2016-03-31

申请号：US14868428

申请日：2015-09-29

申请人： University of North Texas

发明人： Wonbong Choi ,  Nitin Choudhary

IPC分类号： H01L21/02 ,  H01L29/786 ,  H01L29/66

CPC分类号： H01L21/02568 ,  H01L21/02444 ,  H01L21/02485 ,  H01L21/02507 ,  H01L21/02527 ,  H01L21/0259 ,  H01L21/02614 ,  H01L21/02631 ,  H01L29/24 ,  H01L29/66969 ,  H01L29/778 ,  H01L29/78681 ,  H01L29/78696

摘要： The invention is for fabricating large-area, thickness-modulated MoS2, varying from single to few layer MoS2 films on various substrates using a combination of magnetron sputtering followed by chemical vapor deposition. The thickness dependent energy bandgap engineering and surface induced polarity change is disclosed.

摘要翻译： 本发明用于制造大面积，厚度调制的MoS2，其使用磁控溅射，然后化学气相沉积的组合，在各种衬底上从单层到几层MoS 2膜变化。 公开了厚度依赖能带隙工程和表面诱发极性变化。

公开(公告)号：US20230246187A1

公开(公告)日：2023-08-03

申请号：US18132871

申请日：2023-04-10

申请人： University of North Texas

发明人： Wonbong Choi

IPC分类号： H01M4/58 ,  H01M4/133 ,  H01M4/04

CPC分类号： H01M4/5815 ,  H01M4/133 ,  H01M4/0426 ,  H01M4/0428 ,  H01M2004/028

摘要： Two-dimensional (2D) material-based metal or alloy catalysts synthesized on carbon materials (e.g., carbon nanotubes) prevent polysulfide shuttling and overcome technical challenges for developing practical lithium-sulfur (Li—S) batteries. Soluble lithium polysulfides (LiPSs) tend to shuttle during battery cycling and corrode a Li anode, leading to eventual performance fading in the Li—S battery. This shuttle effect can be reduced by accelerating the conversion of the dissolved polysulfides to the insoluble LiPSs and back to the sulfur. A 2D material-based alloy or 2D material synthesized on carbon materials can suppress polysulfide shuttling by catalyzing polysulfide reactions. 2D material-based alloys with 2H (semiconducting)-1T (metallic) mixed phase exhibit synergistic effects of accelerated electron transfer and catalytic performance as confirmed by the lower charge-transfer resistance of carbon nanotube (CNT)-S cathode and the high binding energy of LiPSs to the catalyst.

公开(公告)号：US11652206B2

公开(公告)日：2023-05-16

申请号：US17219523

申请日：2021-03-31

申请人： University of North Texas

发明人： Wonbong Choi

IPC分类号： H01M4/58 ,  H01M4/13 ,  H01M4/04 ,  H01M4/133 ,  H01M4/02

CPC分类号： H01M4/5815 ,  H01M4/0426 ,  H01M4/0428 ,  H01M4/133 ,  H01M2004/028

摘要： Two-dimensional (2D) material-based metal or alloy catalysts synthesized on carbon materials (e.g., carbon nanotubes) prevent polysulfide shuttling and overcome technical challenges for developing practical lithium-sulfur (Li—S) batteries. Soluble lithium polysulfides (LiPSs) tend to shuttle during battery cycling and corrode a Li anode, leading to eventual performance fading in the Li—S battery. This shuttle effect can be reduced by accelerating the conversion of the dissolved polysulfides to the insoluble LiPSs and back to the sulfur. A 2D material-based alloy or 2D material synthesized on carbon materials can suppress polysulfide shuttling by catalyzing polysulfide reactions. 2D material-based alloys with 2H (semiconducting)—1T (metallic) mixed phase exhibit synergistic effects of accelerated electron transfer and catalytic performance as confirmed by the lower charge-transfer resistance of carbon nanotube (CNT)—S cathode and the high binding energy of LiPSs to the catalyst.

公开(公告)号：US11355739B2

公开(公告)日：2022-06-07

申请号：US16482372

申请日：2018-02-09

申请人： University of North Texas

发明人： Wonbong Choi ,  Eunho Cha

IPC分类号： H01M4/133 ,  H01M4/38 ,  H01M4/134 ,  H01M4/04 ,  C01B32/182 ,  C01B32/158 ,  H01M4/1393 ,  H01M10/0525

摘要： The present application relates to methods for depositing two-dimensional materials (e.g., MoS2, WS2, MoTe2, MoSe2, WSe2, BN, BN—C composite, and the like) onto lithium electrodes. Battery systems incorporating lithium metal electrodes coated with two-dimensional materials are also described. Methods may include intercalating the two-dimensional materials to facilitate flow of Lithium ions in and out of the lithium electrode. Two-dimensional material coated lithium electrodes provide for high cycling stability and significant performance improvements. Systems and methods further provide electrodes having carbon structures (e.g., carbon nanotubes (CNTs), graphene, porous carbon, free-standing 3D CNTs, etc.) with sulfur coatings.

公开(公告)号：US20210313576A1

公开(公告)日：2021-10-07

申请号：US17219523

申请日：2021-03-31

申请人： University of North Texas

发明人： Wonbong Choi

IPC分类号： H01M4/58 ,  H01M4/133 ,  H01M4/04

摘要： Two-dimensional (2D) material-based metal or alloy catalysts synthesized on carbon materials (e.g., carbon nanotubes) prevent polysulfide shuttling and overcome technical challenges for developing practical lithium-sulfur (Li—S) batteries. Soluble lithium polysulfides (LiPSs) tend to shuttle during battery cycling and corrode a Li anode, leading to eventual performance fading in the Li—S battery. This shuttle effect can be reduced by accelerating the conversion of the dissolved polysulfides to the insoluble LiPSs and back to the sulfur. A 2D material-based alloy or 2D material synthesized on carbon materials can suppress polysulfide shuttling by catalyzing polysulfide reactions. 2D material-based alloys with 2H (semiconducting)-1T (metallic) mixed phase exhibit synergistic effects of accelerated electron transfer and catalytic performance as confirmed by the lower charge-transfer resistance of carbon nanotube (CNT)-S cathode and the high binding energy of LiPSs to the catalyst.

公开(公告)号：US20220293919A1

公开(公告)日：2022-09-15

申请号：US17689974

申请日：2022-03-08

申请人： University of North Texas

发明人： Wonbong Choi ,  Sanket Bhoyate

IPC分类号： H01M4/36 ,  H01M4/04 ,  H01M10/36 ,  C23C18/54 ,  H01M4/60 ,  H01M4/50

摘要： The present disclosure describes a metal-ion rechargeable battery that includes a metal (such as zinc, aluminum, potassium, sodium, lithium, or lithium-alloys) anode coated with at least one layer of a two-dimensional (2D) transition metal dichalcogenide (TMD) material. The at least one layer of the 2D TMD material, such as molybdenum disulfide (MoS2), may be deposited on the metal electrode using electrochemical deposition. The battery may also include a carbon material cathode coated with at least one layer of manganese dioxide (MnO2) or another electrode material. A method of forming such a battery is also described. Batteries that include metal anodes with 2D TMD material coating may have reduced series resistance, exhibit excellent reversible specific capacity, and have stable performance over many cycles with little to no dendrite formation on the metal anodes.

公开(公告)号：US20220223868A1

公开(公告)日：2022-07-14

申请号：US17576632

申请日：2022-01-14

申请人： University of North Texas

发明人： Wonbong Choi ,  Juhong Park ,  Sungyong In

IPC分类号： H01M4/58 ,  H01M4/583 ,  H01M4/04 ,  H01M4/66

摘要： The present disclosure describes an “anode-less” solid state lithium battery (e.g., a solid-state battery that does not include a lithium metal anode). For example, the battery may include, in place of a conventional anode, a lithium metal-free current collector (e.g., a current collector that does not include lithium metal, such as one that includes copper, copper materials, aluminum, or a lithium alloy) that is coated with at least one layer of a two-dimensional (2D) transition metal dichalcogenide (TMD) material. A solid state electrolyte material may be disposed within the battery between the layer(s) of 2D TMD material and a cathode that includes a matrix structure of carbon materials and sulfur or lithium sulfide particles. A method of forming such a battery is also described. 2D TMD coated lithium metal-free current collectors and solid-state electrolytes provide for reduced lithium dendrite growth, reduced weight, reduced cost, and significant performance improvements to batteries.