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Improved lithium metal oxide rich cathode materials and method to make them

A technology of oxides and metals, applied in chemical instruments and methods, nickel compounds, active material electrodes, etc., can solve problems such as reduction

Inactive Publication Date: 2016-04-06
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, these improvements are usually only able to increase the cycle life by about tens or twenty times, and also significantly reduce other properties, such as the initial specific discharge capacity

Method used

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  • Improved lithium metal oxide rich cathode materials and method to make them
  • Improved lithium metal oxide rich cathode materials and method to make them
  • Improved lithium metal oxide rich cathode materials and method to make them

Examples

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example

[0043] Each of the examples and comparative examples in Table 1 uses the same lithium-rich metal oxide precursor (LRMO precursor) that can form an LRMO upon calcination, which has the formula Li 1.2 Ni 0.17 mn 0.56 co 0.07 o 2 . For Examples A to P, the LRMO precursors were prepared from the corresponding coprecipitated transition metal precursors by known techniques using the corresponding metal carbonate precursors. For Examples A to P, the LRMO precursor was doped using incipient wetness impregnation as follows. The solvents used were water, ethanol, isopropanol and tetrahydrofuran as shown in Table 1. The metal salt was dissolved in a solvent and added dropwise to the LRMO precursor until the point of incipient wetness was reached, as described above. After reaching the point of incipient wetness, for example, the powder can be dried at a low temperature where no LRMO is formed (eg, 130° C. for 30 minutes) and the process repeated to add additional dopant metals. Re...

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Abstract

A method of doping elements (particularly those that do not have stable divalent oxidation states) into lithium rich metal oxides useful in lithium ion batteries is comprised of the following steps. A dopant metal is dissolved in a liquid, which includes being present as a colloid, to form a solution. The solution is added to a particulate lithium rich metal oxide precursor while agitating said precursor to form a mixture. The solution is added in an amount that is at most that amount which would make the mixture a paste. The liquid is removed to form a doped lithium rich metal oxide precursor. A source of lithium is added. The doped lithium rich metal oxide precursor is heated to form the lithium rich metal oxide.

Description

technical field [0001] The present invention relates to a method of making improved lithium-rich metal oxide (LRMO) cathode materials for lithium-ion batteries (LIBs). In particular, the present invention relates to a method of incorporating dopant metals into LRMOs that improves the cycleability of LIBs fabricated from said LRMOs. Background technique [0002] Lithium-ion batteries have been used in portable electronic devices and more recently in hybrid or electric vehicles for the past few decades. Initially, lithium-ion batteries first used lithium cobalt oxide cathodes. Since lithium cobalt oxide cathodes are expensive, have toxicological concerns, and have limited capacity, other cathode materials have been developed or are being developed. [0003] A promising class of materials that has been developed is generally referred to as lithium-rich metal oxides or lithium-rich layered oxides (LRMOs). These materials usually exhibit a layered structure with monoclinic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/50H01M4/52H01M4/525
CPCC01G53/006C01G53/50C01P2002/50C01P2002/54C01P2004/61C01P2004/62C01P2006/12H01M4/505H01M4/525Y02E60/10H01M2004/028
Inventor A·L·斯托特尔迈尔沼田光一S·夏前田英明M·L·德雷伊贝尔维斯M·加德纳
Owner DOW GLOBAL TECH LLC
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