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Method for doping and cladding double modifying for lithium manganate in one step

A double-modified, lithium manganate technology, applied in electrode manufacturing, electrode heat treatment, electrical components, etc., can solve the problems of heavy workload and poor product performance improvement effect, achieve cost savings, easy industrial application, process simple effect

Active Publication Date: 2016-05-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current coating doping is generally carried out in two steps, the workload is relatively large, and the performance improvement effect of the product obtained in two steps is not good.

Method used

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  • Method for doping and cladding double modifying for lithium manganate in one step
  • Method for doping and cladding double modifying for lithium manganate in one step
  • Method for doping and cladding double modifying for lithium manganate in one step

Examples

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Effect test

Embodiment 1

[0037] Weigh 20g trimanganese tetroxide with a median diameter of 12μm and add it to distilled water, and stir in a water bath at 80°C;

[0038] Dilute 3g of aluminum sol with 20ml of distilled water and slowly drop it into the manganese tetroxide aqueous solution that is rapidly stirred at a speed of 600 rpm / min, continue to stir for 60 minutes, and then place it in an oven at 150°C for 12 hours to dry to obtain a powder;

[0039] The obtained powder and 5.15 g of lithium carbonate are fully ground, and the temperature is raised to 650° C. for 6 hours at a heating rate of 2° C. / min, and the temperature is continued to be increased to 800° C. for 15 hours, and the temperature is naturally cooled to room temperature.

[0040] The trimanganese tetroxide used in all the examples and comparative examples was prepared by the following method:

[0041] Take deionized water and add it to the reaction kettle as the bottom liquid, turn on the heating device and stir at a speed of 500r / min. When...

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Abstract

The invention provides a method for doping and cladding double modifying for lithium manganate in one step. In a product obtained by virtue of the method, during the heat treatment process of an aluminum source on the surface of manganous-manganic oxide, partial aluminum can enter the outer layer lithium manganate to form a LiMn2-xAlxO4 solid solution, and the rest aluminum exists in an oxide form, so that the double modification of doping and cladding on the lithium manganate can be achieved. The aluminum oxide can effectively isolate the direct contact between the lithium manganate and electrolyte; the LiMn2-xAlxO4 solid solution has a structure more stable than that of LiMn2O4 under the condition that the passing of lithium ions is not obstructed. The double-functional modification effectively inhibits the dissolution of bivalent manganese, so that the cycling performance and the high temperature performance of the lithium manganate are improved.

Description

Technical field [0001] The invention relates to the field of lithium ion battery cathode materials, in particular to a method for double modification of lithium manganate doping and coating in one step. Background technique [0002] Currently, lithium-ion batteries have been widely used in portable electronic devices such as mobile phones and notebooks. With the excessive consumption of fossil fuels and the intensification of environmental pollution problems, lithium-ion batteries have begun to be used as power batteries in the automotive industry due to the advantages of high operating voltage, high energy density, long cycle life, and environmental protection. [0003] Among commercial lithium ion cathode materials, lithium manganate has the advantages of low cost, large manganese reserves, environmental friendliness, and good safety, making it one of the choices of power battery materials. However, the high temperature cycle performance and structural stability of lithium manga...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M4/04H01M4/1391H01M10/0525
CPCH01M4/0471H01M4/1391H01M4/366H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 胡国荣彭忠东杜柯曹雁冰王高峰
Owner CENT SOUTH UNIV
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