Esther S Takeuchi

US Patent:

6350542, Feb 26, 2002

Filed:

Jan 24, 2000

Appl. No.:

09/490355

Inventors:

Hong Gan - East Amherst NY
Esther S. Takeuchi - East Amherst NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 460

US Classification:

429215, 4292181, 429219, 429220, 4292315, 42923195, 429322, 429328, 429330, 429332, 429333, 429338, 429347

Abstract:

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one sulfite additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl sulfite compound.

US Patent:

6350546, Feb 26, 2002

Filed:

Mar 6, 2000

Appl. No.:

09/519534

Inventors:

Hong Gan - East Amherst NY
Esther S. Takeuchi - East Amherst NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 616

US Classification:

429340, 429347, 429205, 4292311, 4292312, 4292313, 4292315, 4292318, 42923195, 429330, 429332, 429221, 429223, 429322, 429319, 429232

Abstract:

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one sulfate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is selected from a silyl sulfate, tin sulfate or an organic sulfate.

US Patent:

6377850, Apr 23, 2002

Filed:

Mar 9, 2000

Appl. No.:

09/522327

Inventors:

Esther S. Takeuchi - East Amherst NY
Noelle M. Waite - Clarence Center NY
Kenneth C. Syracuse - Williamsville NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

A61N 108

US Classification:

607 2, 607 29, 320136, 320161

Abstract:

A âfuel gaugeâ for a pulse dischargeable alkali metal/solid cathode cell is described. The rate of voltage recovery is used to determine the state of charge of the cell. Voltage recovery includes recovery from one load to a second, lighter load, or a loaded condition to OCV. The present invention is particularly useful as an end-of-life indicator for a Li/CF cell powering an implantable medical device.

US Patent:

6403256, Jun 11, 2002

Filed:

Jan 24, 2000

Appl. No.:

09/490356

Inventors:

Hong Gan - East Amherst NY
Esther S. Takeuchi - East Amherst NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 460

US Classification:

429215, 4292181, 429219, 429220, 4292315, 42923195, 429322, 429328, 429330, 429332, 429333, 429338, 429347

Abstract:

An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one organic sulfite additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and a sulfite additive having at least one unsaturated hydrocarbon containing a C(sp or sp )âC(sp ) bond unit having the C(sp ) carbon directly connected to the âOSO â functional group.

US Patent:

6410181, Jun 25, 2002

Filed:

May 2, 2000

Appl. No.:

09/562532

Inventors:

David M. Spillman - Tonawanda NY
Esther S. Takeuchi - East Amherst NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 436

US Classification:

429101, 429242, 29 2

Abstract:

An alkali metal electrochemical cell, and particularly a lithium oxyhalide cell, is described. The oxyhalide cell also exhibits superior restart characteristics by the provision of a MANNIGLASS 1200 separator.

US Patent:

6413669, Jul 2, 2002

Filed:

Apr 4, 2000

Appl. No.:

09/542227

Inventors:

Esther S. Takeuchi - East Amherst NY
Randolph A. Leising - Williamsville NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 1024

US Classification:

4292181, 429219, 42923195

Abstract:

The present invention is directed to a process for preparing a cathode active material consisting of a single phase of mixed metal oxide, such as a single phase silver vanadium oxide. The synthesis technique involves first heating the starting materials to melt a decomposable starting constituent. This first heating temperature is held for a period of time sufficient to enable the decomposable starting constituent to melt and completely flow throughout and within the other starting materials. Then, the thusly produced melt impregnated reaction admixture is preferably ground to ensure complete homogeneity of the starting materials, followed by heating to the decomposition temperature of the decomposable starting constituent. To finish the synthesis, the decomposed admixture is heated to an elevated temperature above the decomposition temperature to provide the single phase mixed metal oxide.

US Patent:

6451483, Sep 17, 2002

Filed:

Sep 26, 2000

Appl. No.:

09/669370

Inventors:

Joseph Probst - Williamsville NY
Esther S. Takeuchi - East Amherst NY
Sally Ann Smesko - North Tonawanda NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 458

US Classification:

4292317, 4292318, 42923195, 429245, 296231

Abstract:

An alkali metal/solid cathode electrochemical cell, particularly a Li/CF cell, having an electrolyte-to-cathode (E/C) weight ratio of about 0. 938 to about 0. 73, and an anode-to-cathode (A/C) capacity ratio of about 1. 03, is described. This provides the cell with an improvement in terms of delivered capacity of about 6% to about 15% under a 1 kohm discharge load, and of about 2% to about 5% under a 2 kohm load in comparison to prior art Li/CF cells. Fabricating the cathode electrode at such high pressures was not previously thought possible.

US Patent:

6475666, Nov 5, 2002

Filed:

Feb 19, 1997

Appl. No.:

08/801006

Inventors:

Esther S. Takeuchi - Williamsville NY

Assignee:

Wilson Greatbatch Ltd. - Clarence NY

International Classification:

H01M 218

US Classification:

429144, 429145, 429142, 429 62

Abstract:

A separator for shutting down current flow in a lithium or other alkali metal battery during a short circuit condition to prevent cell rupture. In one form, the separator comprises a layer of microporous polyethylene film, or other suitable microporous film having a melting point which is less than about 135Â C. , for providing good puncture resistance and for melting at a low temperature for increasing the margin of safety without significantly sacrificing performance. The separator also includes a layer of non-woven polypropylene, or other suitable non-woven material having a melting point which is at least about 10Â C. higher than the melting point of the microporous film, to provide good strength and tear resistance so as to maintain physical integrity of the separator so that the short circuit condition is not worsened. In another form the separator comprises the combination of polyethylene on one of the battery electrodes, i. e. anode or cathode, and polypropylene on the other of the battery electrodes.