David Chavis Shepard

US Patent:

20220393179, Dec 8, 2022

Filed:

Oct 30, 2020

Appl. No.:

17/770105

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Yunkui Li - Ann Arbor MI, US
Anatoly Bortun - Ypsilanti MI, US

International Classification:

H01M 4/62
H01M 50/446
H01M 10/0567
H01M 10/0525
H01M 50/124
H01M 50/451
H01M 50/414

Abstract:

A cell for use in an electrochemical cell, such as a lithium-ion secondary battery that includes a positive electrode with an active material that acts as a cathode and a current collector; a negative electrode with an active material that acts as an anode and a current collector; a non-aqueous electrolyte; and a separator placed between the positive and negative electrodes. At least one of the cathode, the anode, the electrolyte, and the separator includes an inorganic additive in the form of a transition phase alumina or a type of boehmite that absorbs one or more of moisture and/or hydrogen fluoride (HF) that become present in the cell. One or more cells may be combined in a housing to form a lithium-ion secondary battery. The inorganic additive may also be incorporated as a coating applied to the internal wall of the housing.

US Patent:

20220393239, Dec 8, 2022

Filed:

Oct 30, 2020

Appl. No.:

17/770106

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Yunkui Li - Ann Arbor MI, US
Anatoly Bortun - Ypsilanti MI, US

International Classification:

H01M 10/0567
H01M 4/62
H01M 50/431
H01M 50/124
H01M 10/0525
H01M 50/117

Abstract:

A cell for use in an electrochemical cell, such as a lithium-ion secondary battery that includes a positive electrode with an active material that acts as a cathode and a current collector; a negative electrode with an active material that acts as an anode and a current collector; a non-aqueous electrolyte; and a separator placed between the positive and negative electrodes. At least one of the cathode, the anode, the electrolyte, and the separator includes an inorganic additive in the form of a metal aluminate or a mixture of metal aluminates that absorbs one or more of moisture, free transition metal ions, or hydrogen fluoride (HF) that become present in the cell. One or more of the cells may be combined in a housing to form a lithium-ion secondary battery. The inorganic additive may also be incorporated as a coating applied to the internal wall of the housing.

US Patent:

20220379284, Dec 1, 2022

Filed:

May 10, 2022

Appl. No.:

17/740403

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Ashwin Sankaran - Arnhem, NL
Wei Wu - Ann Arbor MI, US
Yunkui Li - Ann Arbor MI, US

International Classification:

B01J 20/18
B01D 15/36
B01J 20/10
B01J 20/08
B01J 20/04
B01J 20/02
B01J 20/28

Abstract:

An apparatus, system, and method for removing impurities from a non-aqueous electrolyte used in an electrochemical cell. The apparatus includes a vessel having one or more chambers with an inlet and an outlet configured to allow the flow of the electrolyte through the one or more chambers; and an inorganic scavenging agent located within the one or more chambers. The inorganic scavenging agent includes one or more types of zeolite particles, at least one type of absorbent filler particles, or a combination of the zeolite and absorbent filler particles. The inorganic scavenging agent absorbs one or more of moisture, free transition metal ions, or hydrogen fluoride (HF) that is present as impurities in the non-aqueous electrolyte.

US Patent:

20220376357, Nov 24, 2022

Filed:

Oct 30, 2020

Appl. No.:

17/772268

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Yunkui Li - Ann Arbor MI, US
Anatoly Bortun - Ypsilanti MI, US

International Classification:

H01M 50/446
H01M 50/434
H01M 50/417
H01M 10/0525

Abstract:

An electrochemical cell that includes a positive electrode with an active material acting as a cathode; a negative electrode with an active material acting as an anode; a non-aqueous electrolyte; and a separator placed between the positive electrode and negative electrode. In one embodiment, the separator includes an inorganic material, i.e., a type of boehmite, formed of nanometer-sized particles and optionally one or more binders and/or ceramic particles. In a second embodiment, at least one of the cathode, the anode, the electrolyte, and the separator includes the boehmite particles, which absorb one or more of moisture and/or hydrogen fluoride that become present in the cell. One or more of the cells may be combined in a housing to form a lithium-ion secondary battery.

US Patent:

20230031405, Feb 2, 2023

Filed:

Dec 21, 2020

Appl. No.:

17/789535

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Yunkui Li - Ann Arbor MI, US
Ashwin Sankaran - Arnhem, NL

International Classification:

H01M 10/0525
H01M 50/451
H01M 50/414
H01M 50/46
H01M 50/446
H01M 4/485
H01M 4/38
H01M 4/583
H01M 10/0568
H01M 50/491

Abstract:

An electrochemical cell, such as a secondary cell of a lithium-ion battery, that includes a positive electrode with an active material that acts as a cathode; a negative electrode with an active material that acts as an anode; a non-aqueous electrolyte; and a separator placed between the positive electrode and negative electrode. The separator including an inorganic material. This inorganic material includes a mixture of a first inorganic particle and one or more second inorganic particles; wherein the inorganic material absorbs one or more of moisture, free transition metal ions, or hydrogen fluoride (HF) that become present in the electrochemical cell. One or more of the cells may be combined in a housing to form a lithium-ion secondary battery.

US Patent:

20210403334, Dec 30, 2021

Filed:

Nov 4, 2019

Appl. No.:

17/290794

Inventors:

- Ann Arbor MI, US
De Gao - Troy MI, US
David Shepard - Canton MI, US
Wei Wu - Ann Arbor MI, US
Jeffery Lachapelle - Northville MI, US
Geng Zhang - Utsunomiya, JP

International Classification:

C01B 39/48

Abstract:

A method of forming AEI-type zeolites in a hydrothermal synthesis without the use of hydrogen fluoride (HF) and in the presence of an FAU zeolite NaY with SAR ≤5, a Y zeolite with a SAR ≥5, or a combination thereof. A gel composition formed upon using this method includes one or more sources of silica, alumina, organic structure directing agents (OSDA), and alkali metal ions; zeolite seeds; and water. This gel composition is defined by the molar ratios of: SiO/AIO18:1 to 100:1; MO/SiO0.15:1 to 0.30:1; ROH/SiO0.05:1 to 0.13:1; and HO/SiO5:1 to 20:1; wherein M is the alkali metal ion and R is an organic moiety derived from the OSDA. This gel composition, after reacting at a temperature between 135 C. to about 200 C. for 10 hours to 168 hours forms the crystalline AEI-type zeolite having a silica to alumina ratio (SiO:AIO) that is greater than 15:1.

US Patent:

20210300778, Sep 30, 2021

Filed:

Jun 11, 2021

Appl. No.:

17/345121

Inventors:

- Ann Arbor MI, US
David Shepard - Canton MI, US
Jin Cho - Utsunomiya, JP
Mila Bortun - Ypsilanti MI, US
Yunkui Li - Ann Arbor MI, US
Wei Wu - Ann Arbor MI, US
Jeffery Lachapelle - Northville MI, US

International Classification:

C01G 25/00
F01N 3/10

Abstract:

A nanocrystal-sized cerium-zirconium mixed oxide material includes at least 30% by mass zirconium oxide; between 5% to 55% by mass cerium oxide; and a total of 25% or less by mass of at least one oxide of a rare earth metal selected from the group of lanthanum, neodymium, praseodymium, or yttrium. The nanocrystal-sized cerium-zirconium mixed oxide exhibits hierarchically ordered aggregates having a dparticle size less than 1.5 μm and a total pore volume after calcination at a temperature of 600 C. or more that is at least 0.7 cm/g with a fraction of pores between 2 nm to 10 nm being less than 15%. The nanocrystal-sized cerium-zirconium mixed oxide material is prepared using a co-precipitation method followed by milling the dried and calcined oxide material. The nanocrystal-sized cerium-zirconium mixed oxide material forms a particulate filter that may be used in an exhaust system arising from a gas or diesel engine.

US Patent:

20190336954, Nov 7, 2019

Filed:

May 1, 2018

Appl. No.:

15/967896

Inventors:

- Ann Arbor MI, US
Geng Zhang - Utsunomiya, JP
De Gao - Troy MI, US
David Shepard - South Lyon MI, US
Yunkui Li - Ann Arbor MI, US
Jeffery Lachapelle - Northville MI, US

International Classification:

B01J 29/76
B01J 29/70
B01J 35/00
B01J 35/10
B01J 37/30
B01J 37/02
B01D 53/94
F01N 3/20

Abstract:

A crystalline, core-shell hybrid Chabazite (CHA) material for use as a catalyst has a core with a silicon to aluminum ratio (SAR) that is less than 25 and a shell that at least partially encapsulates the core, the shell having an SAR of about 25 or greater. The crystalline, core-shell hybrid Chabazite is prepared by forming a first chabazite (CHA) material having a silicon to aluminum ratio (SAR) that is less than 25, placing the first CHA material into an aqueous reaction mixture comprising one or more precursors capable of forming a second chabazite (CHA) material having an SAR that is 25 or greater, growing the second CHA material on the surface of the first CHA material, and collecting the core-shell hybrid CHA material.