Ping V Liu

US Patent:

20100291416, Nov 18, 2010

Filed:

May 13, 2009

Appl. No.:

12/465102

Inventors:

Mark W. Verbrugge - Troy MI, US
Ping Liu - Irvine CA, US
Elena Sherman - Culver City CA, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

H01M 10/44
H01M 4/02
H01M 4/58
H01M 4/48

US Classification:

429 50, 429209, 42923195, 4292318, 4292311, 429221

Abstract:

An exemplary embodiment includes a battery cell electrode including a first material having a first potential versus state of charge (SOC) relationship; a second material having a second potential versus state of charge (SOC) relationship; wherein the second material becomes active to transfer ions at a selected SOC level to result in a readily observable change in measured potential from the first to the second potential versus SOC relationship.

US Patent:

20110014548, Jan 20, 2011

Filed:

Jul 20, 2009

Appl. No.:

12/505557

Inventors:

Richard H. Blunk - Macomb Township MI, US
Ping Liu - Irvine CA, US
Sky Leigh Van Atta - Los Angeles CA, US
Kevin W. Kirby - Calabasas Hills CA, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

H01M 2/00
C07C 303/02
B05D 5/12
C25D 5/34
H01M 4/82

US Classification:

429518, 562 45, 427115, 205205, 296235, 429535

Abstract:

A fuel cell comprises a bipolar plate having a conductive and hydrophilic surface layer disposed on at least a portion of its exterior area. The surface layer comprises a conductive carbon material having a hydrophilic organic group covalently attached to its surface. A process of producing a bipolar plate and a fuel cell is also disclosed.

US Patent:

20120101674, Apr 26, 2012

Filed:

Oct 26, 2010

Appl. No.:

12/912407

Inventors:

SHUOQIN WANG - WESTLAKE CA, US
MARK W. VERBRUGGE - TROY MI, US
JOHN S. WANG - LOS ANGLES CA, US
PING LIU - IRVINE CA, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - DEROIT MI

International Classification:

G06F 17/10
G01R 31/36

US Classification:

701 22, 702 63, 180 6521, 903903

Abstract:

A method of determining and predicting a state of a rechargeable battery device in real time involves measuring a current and a voltage of the rechargeable battery in real time, inputting the measured current and voltage into an algorithm, and applying the algorithm to determine the state of the rechargeable battery. The algorithm includes a first mathematical model based on a direct solution of at least one differential equation characterizing an equivalent RC circuit of the battery as a function of time. The first model generates a plurality of parameters that are usable to determine the state of the battery. The algorithm further includes a second mathematical model configured to regress the parameters over time, and a third mathematical model configured to estimate the state of the battery.

US Patent:

20120109503, May 3, 2012

Filed:

Jun 28, 2011

Appl. No.:

13/170241

Inventors:

Jihui Yang - Lakeshore, CA
Mark W. Verbrugge - Troy MI, US
Ping Liu - Irvine CA, US
John S. Wang - Los Angeles CA, US
Steven Cai - Macomb MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

F02N 11/08

US Classification:

701113

Abstract:

The operation of internal combustion, reciprocating engines in some automotive vehicles may be managed such that the engine operation is stopped each time the vehicle is brought to a stop, and then the engine is re-started when the operator presses the accelerator pedal to put the vehicle in motion. In some driving situations the engine of the vehicle may be stopped and re-started many times, which is a mode of engine operation for which the traditional 12 volt, lead-acid battery is not well suited. It is found that a six cell, lithium-ion battery combining LiFePOas the active positive electrode material and LiTiOas the active negative electrode material, together with suitable separators and a suitable low freezing point electrolyte may be adapted to deliver starting power for repeated engine starting, despite short intervening charging periods.

US Patent:

20130071736, Mar 21, 2013

Filed:

Sep 16, 2011

Appl. No.:

13/234209

Inventors:

Xingcheng Xiao - Troy MI, US
Anil K. Sachdev - Rochester Hills MI, US
Mark W. Verbrugge - Troy MI, US
Ping Liu - Irvine CA, US
John S. Wang - Los Angeles CA, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

H01M 4/38
H01B 1/04
C23C 14/16
H01M 4/64
H01M 4/485
B82Y 30/00

US Classification:

429211, 4292181, 252512, 427527, 977779

Abstract:

A composite of silicon and tin is prepared as a negative electrode composition with increased lithium insertion capacity and durability for use with a metal current collector in cells of a lithium-ion battery. This electrode material is formed such that the silicon is present as a distinct amorphous phase in a matrix phase of crystalline tin. While the tin phase provides electron conductivity, both phases accommodate the insertion and extraction of lithium in the operation of the cell and both phases interact in minimizing mechanical damage to the material as the cell experiences repeated charge and discharge cycles. In general, roughly equal atomic proportions of the tin and silicon are used in forming the phase separated composite electrode material.

US Patent:

20140113197, Apr 24, 2014

Filed:

Oct 18, 2012

Appl. No.:

13/654905

Inventors:

Xingcheng Xiao - Troy MI, US
Mark W. Verbrugge - Troy MI, US
John S. Wang - Los Angeles CA, US
Ping Liu - Irvine CA, US

International Classification:

H01M 4/485
H01M 4/04
H01M 4/505
H01M 4/525
B82Y 30/00

US Classification:

429223, 4292311, 429224, 427 58, 977755

Abstract:

An electroactive material for use in an electrochemical cell, like a lithium-ion battery, is provided. The electroactive material comprises lithium titanate oxide (LTO) and has a surface coating with a thickness of less than or equal to about 30 nm that suppresses formation of gases within the electrochemical cell. Methods for making such materials and using such materials to suppress gas formation in electrochemical cells are likewise provided.

US Patent:

20140106220, Apr 17, 2014

Filed:

Dec 13, 2013

Appl. No.:

14/105241

Inventors:

- Detroit MI, US
Anil K. Sachdev - Rochester Hills MI, US
Mark W. Verbrugge - Troy MI, US
Ping Liu - Irvine CA, US
John S. Wang - Los Angeles CA, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

H01M 4/36

US Classification:

4292181, 252512

Abstract:

A composite of silicon and tin is prepared as a negative electrode composition with increased lithium insertion capacity and durability for use with a metal current collector in cells of a lithium-ion battery or a lithium-sulfur battery. This negative electrode material is formed such that the silicon is present as a distinct amorphous phase in a matrix phase of crystalline tin. While the tin phase provides electron conductivity, both phases accommodate the insertion and extraction of lithium in the operation of the cell and both phases interact in minimizing mechanical damage to the material as the cell experiences repeated charge and discharge cycles. In general, roughly equal atomic proportions of the tin and silicon are used in forming the phase separated composite electrode material.