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Modified lithium manganate material, and preparation method and application thereof

A technology of permanent lithium manganese oxide and manganese ions, which is applied in the field of modified lithium manganate materials, can solve the problems of low capacity of lithium manganate, influence on material performance, weak binding force, etc., and achieve high current and excellent cycle performance with low cost Inexpensive, good stability

Active Publication Date: 2013-04-10
嘉善县国创新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the capacity of lithium manganese oxide itself is not high, if the overall doping will lead to a further decrease in capacity, and simple surface modification will affect the material performance due to weak binding force or blocking lithium ion diffusion channels.

Method used

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  • Modified lithium manganate material, and preparation method and application thereof
  • Modified lithium manganate material, and preparation method and application thereof
  • Modified lithium manganate material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing aluminum nitrate nonahydrate powder 0.188g, be made into 20ml solution, measure 50wt.% manganese nitrate (Mn(NO 3 ) 2 ) solution, 0.349ml, was dropped into the aluminum nitrate solution, and stirred evenly. Weigh 0.696g of manganese dioxide, put it into the mixed solution, stir evenly, weigh 0.42g of lithium hydroxide monohydrate, dissolve it in 10ml of deionized water, slowly drop it into the mixed solution, and stir for 30 minutes. The above mixed solution was placed in a hydrothermal reactor at 200 o C reacted for 20 hours, filtered, washed and dried to obtain the finished precursor, after 3 hours 750 o C heat treatment to prepare LiMn 1.5 al 0.5 o 3.95 Uniformly coated LiMn 2 o4 Powder, coating element stoichiometry was determined by X-ray photoelectron spectroscopy (XPS).

[0033] X-ray diffraction analysis was done to the modified lithium manganate material prepared in this way, by figure 1 It can be seen that the prepared lithium manganat...

Embodiment 2

[0037] Take by weighing nickel nitrate hexahydrate powder 0.145g, be made into 20ml solution, measure 50wt.% manganese nitrate (Mn(NO 3 ) 2 ) solution 0.349ml, drop in the nickel nitrate solution, and stir evenly. Weigh 0.696g of manganese dioxide, put it into the mixed solution, stir evenly, weigh 0.42g of lithium hydroxide monohydrate, dissolve it in 10ml of deionized water, slowly drop it into the mixed solution, and stir for 30 minutes. The above mixed solution was placed in a hydrothermal reactor at 200 o C reacted for 20 hours, filtered, washed and dried to obtain the finished precursor, after 3 hours 750 o C heat treatment to prepare LiMn 1.5 Ni 0.5 o 3.95 Uniformly coated LiMn 2 o 4 Powder, coating element stoichiometry was determined by X-ray photoelectron spectroscopy (XPS).

[0038] Using the prepared modified lithium manganese oxide material as the positive electrode material, assemble it into a 2032 button battery according to the method of Example 1, and ...

Embodiment 3

[0040] Take by weighing cerium nitrate hexahydrate powder 0.217g, be made into 20ml solution, measure 50wt.% manganese nitrate (Mn(NO 3 ) 2 ) solution 0.349ml, drop into the cerium nitrate solution, and stir evenly. Weigh 0.696g of manganese dioxide, put it into the mixed solution, stir evenly, weigh 0.42g of lithium hydroxide monohydrate, dissolve it in 10ml of deionized water, slowly drop it into the mixed solution, and stir for 30 minutes. The above mixed solution was placed in a hydrothermal reactor at 200 o C reacted for 20 hours, filtered, washed and dried to obtain the finished precursor, after 3 hours 750 o C heat treatment to prepare LiMn 1.5 Ce 0.5 o 3.97 Uniformly coated LiMn 2 o 4 Powder, coating element stoichiometry was determined by X-ray photoelectron spectroscopy (XPS).

[0041] Using the prepared modified lithium manganese oxide material as the positive electrode material, assemble it into a 2032 button battery according to the method of Example 1, an...

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Abstract

The invention discloses a modified lithium manganate material, and a preparation method and application thereof. The modified lithium manganate material adopts a core-shell structure taking LiMn204 as a core and LiMn2-xMxO4-delta as a coating layer, wherein M is one of Al, Ti, Ce, Co and Ni, the value of x ranges from 0.05 to 0.5, and delta ranges from 0.01-0.1. The modified lithium manganate material is prepared by co-precipitation coating, hydro-thermal reaction and high-temperature heat treatment, and used as the cathode material of a lithium ion battery. The preparation process is simple and feasible, the components and the proportion of the raw materials are easy to control, the stability from batch to batch is good, the cost is low, and the synthesized lithium manganate material is high in specific capacity, high in current and excellent in cycle performance, and is expected to be applied in the field of power cells.

Description

(1) Technical field: [0001] The invention relates to a modified lithium manganate material LiMn with a core-shell structure 2-x m x o 4-δ LiMn 2 o 4 Its preparation method and application as lithium ion battery cathode material. (2) Background technology: [0002] Since the discovery that lithium manganese oxide with a spinel structure can be used as the cathode material of lithium-ion batteries, due to its excellent electrochemical performance, abundant raw material sources, good safety performance, environmental protection and non-toxicity, it has become the most active research and development. It is one of the cathode materials with the greatest strength and the most application prospects, and is favored by a large number of scientific research institutions and commercial companies. Now people have preliminarily realized the commercial production of spinel lithium manganese oxide, and the lithium-ion power battery using it as the positive electrode material has also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/10
Inventor 王连邦姚金翰沈超奇
Owner 嘉善县国创新能源研究院
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