Doping type spinel lithium manganate electrode material and preparation method thereof

A spinel lithium manganate, electrode material technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problem of low capacity retention rate and low capacity retention rate of lithium ion batteries, and it is difficult to meet the needs of high-power lithium ion batteries. requirements and other issues, to achieve the effect of suppressing the Jahn-Teller effect, low specific surface area, and reducing material cost

Active Publication Date: 2013-01-30
焦作伴侣纳米材料工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity retention rate of lithium-ion batteries using this electrode material is low, especially at rel

Method used

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  • Doping type spinel lithium manganate electrode material and preparation method thereof
  • Doping type spinel lithium manganate electrode material and preparation method thereof
  • Doping type spinel lithium manganate electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] The molecular formula of the doped spinel lithium manganate electrode material of this embodiment is LiMn 1.7 Cr 0.2 Co 0.1 O 4 .

[0037] The doped spinel lithium manganate electrode material of this embodiment is prepared by the following method:

[0038] 1) Solution configuration:

[0039] Solution A: Prepare manganese sulfate into 1.0mol / L manganese sulfate aqueous solution, take chromium nitrate and dissolve it in the manganese sulfate aqueous solution according to the formula Mn:Cr=1.7:0.2 to obtain solution A;

[0040] Solution B: Prepare the buffering agent ammonium bicarbonate into a 1.5mol / L aqueous solution of ammonium bicarbonate to obtain solution B;

[0041] 2) Precursor preparation:

[0042] Combine solution A and solution B in step 1) into the co-precipitation tank at a flow rate of 2.0L / h, adjust the pH of the system to 7.0, keep it at 55°C and keep stirring for 3h, filter and dry to obtain precursor precipitation ;

[0043] 3) Treatment of the f...

Example Embodiment

[0051] Example 2

[0052] The molecular formula of the doped spinel lithium manganate electrode material of this embodiment is LiMn 1.5 Al 0.3 Co 0.2 O 4 .

[0053] The doped spinel lithium manganate electrode material of this embodiment is prepared by the following method:

[0054] 1) Solution configuration:

[0055] Solution A: Prepare manganese nitrate into a 0.6mol / L aqueous solution of manganese nitrate, take aluminum sulfate according to the formula Mn: Al=1.5: 0.3 and dissolve it in the aqueous solution of manganese nitrate to obtain solution A;

[0056] Solution B: The buffering agent sodium carbonate is formulated into a 0.8mol / L sodium carbonate aqueous solution to obtain solution B;

[0057] 2) Precursor preparation:

[0058] Combine solution A and solution B in step 1) into the co-precipitation tank at a flow rate of 2.0L / h, adjust the pH of the system to 8.5, keep it warm at 60°C and continue stirring for 2h, filter and dry to obtain precursor precipitation ;

[0059] 3) Trea...

Example Embodiment

[0067] Example 3

[0068] The molecular formula of the doped spinel lithium manganate electrode material of this embodiment is LiMn 1.45 Mg 0.4 Co 0.15 O 4 .

[0069] The doped spinel lithium manganate electrode material of this embodiment is prepared by the following method:

[0070] 1) Solution configuration:

[0071] Solution A: Prepare manganese acetate into a 0.2mol / L manganese acetate aqueous solution, take magnesium acetate according to the formula Mn:Mg=1.45:0.4 and dissolve it in the manganese acetate aqueous solution to obtain solution A;

[0072] Solution B: Prepare a 0.2mol / L potassium carbonate aqueous solution with the buffering agent potassium carbonate to obtain solution B;

[0073] 2) Precursor preparation:

[0074] Combine solution A and solution B in step 1) into the co-precipitation tank at a flow rate of 8.0L / h, adjust the pH of the system to 9.5, keep it at 40°C and keep stirring for 6h, filter and dry to obtain precursor precipitation ;

[0075] 3) Treatment of the ...

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Abstract

The invention discloses a doping type spinel lithium manganate electrode material and a preparation method of the doping type spinel lithium manganate electrode material, wherein the molecular formula of the doping type spinel lithium manganate electrode material is LiMn2-x-yMxNyO4; and in the formula, M and N are doping elements and selected from any two of Al, Mg, Cr and Co, and x+y is greater than 0 and less than 0.6. According to the doping type spinel lithium manganate electrode material, two metal elements M and N are used as epiphase dopants for remarkably improving the structure of pure lithium manganate, so that the proportion of trivalent Mn is further reduced, the stability of the structure is increased and the Jahn-Teller effect is restricted, and at the same time, the metal elements M and N are capable of restricting the dissolution of the Mn on the surface of the lithium manganate, so that the cycle performance and the high/low-temperature performance of the lithium manganate are improved; and at the same time, the epiphase doping has the effect of decreasing the doping amount under the condition with same doping effect, so that benefit is brought to reduce the material cost. The spinel lithium manganate electrode material provided by the invention is characterized by being suitable for the high-power lithium cells of electric tools and electric vehicles.

Description

technical field [0001] The invention relates to a spinel lithium manganate electrode material and a preparation method thereof, in particular to a doped spinel lithium manganate electrode material and a preparation method thereof, which belong to battery electrode active materials. Background technique [0002] The lithium manganese oxide electrode material with spinel structure has high working voltage, low price, wide source of raw materials, and no pollution to the environment. It is the most competitive electrode material especially in the field of power battery applications. Therefore, spinel-type lithium manganese oxide is considered to be one of the positive electrode materials for lithium batteries with good application prospects. However, lithium batteries using lithium manganese oxide as the positive electrode material in the prior art have obvious capacity decay during storage or discharge cycles, which hinders the wide application of lithium manganate materials. ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 李世江侯红军杨华春薛旭金罗成果罗传军田英鸽李小强纪冰秦俊光叶文豪
Owner 焦作伴侣纳米材料工程有限公司
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