Chunhu T Tan

US Patent:

20130062573, Mar 14, 2013

Filed:

Sep 10, 2010

Appl. No.:

12/879423

Inventors:

Zhigang Lin - Irvine CA, US
Chunhu Tan - Irvine CA, US

Assignee:

AEGIS TECHNOLOGY, INC - Garden Grove CA

International Classification:

H01B 1/04
H01B 1/00

US Classification:

252506, 252500

Abstract:

Objects of the present invention include creating cathode materials that have high energy density and are cost-effective, environmentally benign, and are able to be charged and discharged at high rates for a large number of cycles over a period of years. One embodiment is a battery material comprised of a doped nanocomposite. The doped nanocomposite may be comprised of Li—Co—PO4; C; and at least one X, where said X is a metal for substituting or doping into LiCoPO4. In certain embodiments, the doped nanocomposite may be LiCoMnPO4/C. Another embodiment of the present invention is a method of creating a battery material comprising the steps of high energy ball milling particles to create complex particles, and sintering said complex particles to create a nanocomposite. The high energy ball milling may dope and composite the particles to create the complex particles.

US Patent:

20130063184, Mar 14, 2013

Filed:

Sep 9, 2010

Appl. No.:

12/878931

Inventors:

Xiaoning Liang - Santa Ana CA, US
Chunhu Tan - Irvine CA, US
Zhigang Lin - Irvine CA, US

Assignee:

AEGIS TECHNOLOGY, INC - Garden Grove CA

International Classification:

H03K 3/00
H01L 27/088
H01L 29/161

US Classification:

327108, 257 77, 257E29084

Abstract:

Versions of the present invention have many advantages, including operation under high temperatures, or high frequencies while providing the required current for switching a SiC VJFET, providing electrical isolation and minimizing dv/dt noise. One embodiment is a silicon carbide gate driver comprising a first group of silicon on insulator devices and passive components and a second group of silicon carbide devices. The first group may have equivalent temperatures of operation and equivalent frequencies of operation as the second group.

US Patent:

20130193194, Aug 1, 2013

Filed:

Apr 19, 2010

Appl. No.:

12/763007

Inventors:

Quan Yang - San Diego CA, US
Chunhu Tan - Irvine CA, US
Zhigang Lin - Irvine CA, US

Assignee:

Aegis Technology Inc. - Santa Ana CA

International Classification:

B23K 1/00
B23K 35/02
B23K 35/34

US Classification:

2282629, 148 24, 428576

Abstract:

A superior braze material, along with a method of producing the braze material and a method of sealing, joining or bonding materials through brazing is disclosed. The braze material is based on a metal oxide-noble metal mixture, typically Ag—CuO, with the addition of a small amount of metal oxide and/or metal such as TiO, AlO, YSZ, Al, and Pd that will further improve wettability and joint strength. Braze filer materials, typically either in the form of paste or thin foil, may be prepared by a high-energy cryogenic ball milling process. This process allows the braze material to form at a finer size, thereby allowing more evenly dispersed braze particles in the resultant braze layer between on the surface of the ceramic substrate and metallic parts.

US Patent:

20220216505, Jul 7, 2022

Filed:

Jan 4, 2021

Appl. No.:

17/140690

Inventors:

- Santa Ana CA, US
Chunhu Tan - Santa Ana CA, US
Tianyu Meng - Santa Ana CA, US

International Classification:

H01M 10/0562
H01M 4/62
H01M 4/525
H01M 4/505
H01M 10/0525

Abstract:

Electrolyte-infiltrated composite electrode includes an electrolyte component consisting of a polymer matrix with ceramic nanoparticles embedded in the matrix to form a networking structure of electrolyte. Suitable ceramic nanoparticles have the basic formula LiLaZrO(LLZO) and its derivatives such as AlLiLaZrTaNbOwhere x ranges from 0 to 0.85, y ranges from 0 to 0.50 and z ranges from 0 to 0.75, wherein at least one of x, y and z is not equal to 0. The networking structure of the electrolyte establishes an effective lithium-ion transport pathway in the electrode and strengthens the contact between electrode layer and solid-state electrolyte resulting in higher lithium-ion electrochemical cell's cycling stability and longer battery life. Sold-state electrolytes incorporating the ceramic particles demonstrate improved performance. Large dimensional electrolyte-infiltrated composite electrode sheets can be used in all solid-state lithium electrochemical pouch cells which can be assembled into battery packs.

US Patent:

20210159144, May 27, 2021

Filed:

Nov 26, 2019

Appl. No.:

16/696105

Inventors:

- Santa Ana CA, US
Chunhu Tan - Santa Ana CA, US
Shuyi Chen - Santa Ana CA, US

International Classification:

H01L 23/373
C01B 32/158
C01G 5/00
C01G 19/00
H01L 21/48

Abstract:

A high performance, lead free, Ag paste thermal interface material (TIM) for die attachment and substrate bonding in electronic packaging includes: (i) multiscale silver particles, (ii) metal-coated carbon nanotubes (CNTs), (iii) a polymer, and (iv) a liquid carrier. The multiscale silver particles and metal-coated carbon nanotubes, which function as hybrid filler components, are uniformly dispersed within the TIM composition. The sintered TIM exhibits high density, high mechanical strength, and high thermal conductivity. The components of the liquid carrier including the solvent, binder, surfactants, and thinner are completely evaporated or burned off during sintering. Sintering of the TIM can be conducted at a relatively low temperature, without or with very low (

US Patent:

20210102063, Apr 8, 2021

Filed:

Oct 7, 2019

Appl. No.:

16/595128

Inventors:

- Santa Ana CA, US
Chunhu Tan - Santa Ana CA, US
Tianyu Meng - Santa Ana CA, US
Shuyi Chen - Santa Ana CA, US
Kevin Zanjani - Santa Ana CA, US

International Classification:

C08L 71/02
C08J 5/18
H01M 6/18
H01M 10/052
H01M 10/056

Abstract:

Ceramic-polymer film includes a polymer matrix, plasticizers, a lithium salt, and a ceramic nanoparticle, LLZO: AlLiLaZrTaOwhere x ranges from 0 to 0.85. The nanoparticles have diameters that range from 20 to 2000 nm and the film has an ionic conductivity of greater than 1×10S/cm (−20 C. to 10 C.) and larger than 1×10S/cm (≥20 C.). Using a combination of selected plasticizers to tune the ionic transport temperature dependence enables the battery based on the ceramic-polymer film to be operable in a wide temperature window (−40 C. to 90 C.). Large size nanocomposite film (area ≥8 cm×6 cm) can be formed on a substrate and the concentration of LLZO nanoparticles decreases in the direction of the substrate to form a concentration gradient over the thickness of the film. This large size film can be employed as a non-flammable, solid-state electrolyte for lithium electrochemical pouch cell and further assembled into battery packs.

US Patent:

20200335814, Oct 22, 2020

Filed:

Apr 22, 2019

Appl. No.:

16/390584

Inventors:

- Santa Ana CA, US
Chunhu Tan - Santa Ana CA, US
Chao Yi - Santa Ana CA, US

International Classification:

H01M 10/056
H01M 4/38
H01M 4/58
H01M 10/052

Abstract:

A ceramic-polymer film includes a polymer matrix; a plasticizer; a lithium salt; and AlLiLaZrTaOwhere x ranges from 0.01 to 1 (LLZO), wherein the LLZO are nanoparticles with diameters that range from 20 to 2000 nm and wherein the film has an ionic conductivity of greater than 1×10S/cm at room temperature. The nanocomposite film can be formed on a substrate and the concentration of LLZO nanoparticles decreases in the direction of the substrate to form a concentration gradient over the thickness of the film. The film can be employed as a non-flammable, solid-state electrolyte for lithium electrochemical cells and batteries. The LLZO serves as a barrier to dendrite growth.

US Patent:

20200273620, Aug 27, 2020

Filed:

Feb 27, 2019

Appl. No.:

16/287921

Inventors:

- Santa Ana CA, US
Chunhu Tan - Santa Ana CA, US

International Classification:

H01G 4/12
H01G 4/30
C04B 35/117
C04B 35/622
C04B 35/58
B01J 2/16

Abstract:

Spherical ceramic-glass nanocomposite dielectrics made from ceramics and glasses that are separately pre-milled by mechanical ball milling using selected ball-to-powder weight ratios and combined to form a mixture that is ball milled. A stable liquid suspension of the milled mixture including an added dispersant such as polyacrylic acid to improve uniformity is spray dried through a nozzle and recovered product is annealed. The novel dielectrics have a microstructure where ceramic primary particles are uniformly distributed and fully embedded in a glass matrix. The dielectrics have a mean particle size of about 1-20 um and a sphericity of about 0.8 or higher which are suitable for fabricating multilayer ceramic capacitors for high temperature applications. The novel dielectrics afford decreased sintering temperature, enhanced breakdown strength, lower dielectric lose tangent, and lower costs. Calcium titanate zirconate with manganese-doping-based or barium titanate-based dielectric ceramics and alkali-free borosilicate glass produce superior nanocomposite dielectrics.