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High capacity lithium-ion electrochemical cells and methods of making same

A lithium-ion battery, electrochemical technology, applied in the manufacture of electrolyte batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve the problems of difficult high-energy batteries, poor cycle life, etc., to achieve long cycle life, energy loss, The effect of high capacity

Inactive Publication Date: 2014-06-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such alloys may include one or more of the following electrochemically active elements - Si, Sn, Al, Ga, Ge, In, Bi, Pb, Zn, Cd, Hg, and Sb, however, this is currently difficult to achieve with alloy anodes High energy battery and leads to poor cycle life

Method used

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  • High capacity lithium-ion electrochemical cells and methods of making same
  • High capacity lithium-ion electrochemical cells and methods of making same
  • High capacity lithium-ion electrochemical cells and methods of making same

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Embodiment Construction

[0028] In the following description, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration several specific embodiments. It is to be understood that other embodiments may be conceived and practiced without departing from the scope or spirit of the invention. Therefore, the following specific embodiments are not limiting.

[0029] Unless otherwise indicated, all numerical values ​​expressing characteristic dimensions, quantities and physical properties used in the specification and claims are to be understood as modified by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be determined depending upon the desired properties sought to be obtained by those skilled in the art utilizing the teachings disclosed herein. Variety. The recitation of numerical ranges by endpoints includes all nu...

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Abstract

High capacity lithium-ion electrochemical cells are provided that include positive electrode comprising a layered lithium transition metal oxide having a first irreversible capacity and a negative electrode that includes an alloy anode material that also has a first irreversible capacity. The first irreversible capacity of the positive electrode is less than the first irreversible capacity of the negative electrode. The discharge voltage curve of the positive electrode covers at least 10% of its capacity at voltages below 3.5 V vs. Li / Li+. The average discharge voltage of the positive electrode is above 3.75 V vs. Li / Li+ when the cell is discharged from about 4.6 V vs. Li / Li+ to about 2.5 V vs. Li / Li+ at a rate of C / 10 or slower and when the electrochemical cell is discharged to a final discharge voltage of about 2.5 V vs. Li / Li+ or greater.

Description

technical field [0001] The present invention relates to high capacity lithium ion electrochemical cells. Background technique [0002] Secondary lithium-ion electrochemical cells typically include: a positive electrode, containing lithium in the form of a lithium transition metal oxide (usually in a layered or spinel structure); a negative electrode (usually carbon or graphite); and an electrolyte. Examples of transition metal oxides that have been used in positive electrodes include lithium cobaltate (LCO) and lithium nickelate. Other exemplary transition metal oxide materials that have been used in positive electrodes include mixtures of oxides of cobalt, nickel, and / or manganese. Most commercial lithium-ion electrochemical cells operate by reversible intercalation and extraction of lithium into both the active negative electrode material and the active positive electrode material. To date, the increase in energy density of Li-ion electrochemical cells has mainly been ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/525H01M4/505H01M4/131H01M4/62
CPCH01M4/505Y02E60/122H01M4/525H01M10/0525H01M4/366H01M10/058H01M4/485H01M4/362H01M4/131H01M4/1391Y10T29/49108Y02E60/10Y02P70/50
Inventor 莱夫·克里斯坦森凯文·W·埃贝曼
Owner 3M INNOVATIVE PROPERTIES CO
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