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A kind of doped spinel lithium manganate electrode material and preparation method thereof

A technology of spinel lithium manganese oxide and electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem that it is difficult to meet the requirements of high-power lithium-ion batteries, the low capacity retention rate of lithium-ion batteries, and the low capacity retention rate. Low-level problems, to achieve the effect of suppressing the Jahn-Teller effect, reducing material costs, and low specific surface area

Active Publication Date: 2016-01-06
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 relatively high operating temperatures, and it is difficult to meet the requirements of high-power lithium-ion batteries.

Method used

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  • A kind of doped spinel lithium manganate electrode material and preparation method thereof
  • A kind of doped spinel lithium manganate electrode material and preparation method thereof
  • A kind of doped spinel lithium manganate electrode material and preparation method thereof

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Embodiment 1

[0036] The molecular formula of the doped spinel lithium manganate electrode material of the present embodiment is LiMn 1.7 Cr 0.2 co 0.1 o 4 .

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

[0038] 1) Solution configuration:

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

[0040] Solution B: the buffer ammonium bicarbonate was prepared into a 1.5mol / L ammonium bicarbonate aqueous solution to obtain solution B;

[0041] 2) Pre-body 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 value of the system to 7.0, keep warm at 55°C and keep stirring for 3h, filter and dry to obtain the precursor preci...

Embodiment 2

[0052] The molecular formula of the doped spinel lithium manganate electrode material of the present embodiment is LiMn 1.5 Al 0.3 co 0.2 o 4.

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

[0054] 1) Solution configuration:

[0055] Solution A: Manganese nitrate was prepared into a 0.6mol / L manganese nitrate aqueous solution, and aluminum sulfate was taken according to the ratio Mn:Al=1.5:0.3 in the molecular formula and dissolved in the manganese nitrate aqueous solution to obtain solution A;

[0056] Solution B: the buffer sodium carbonate was prepared into a 0.8mol / L sodium carbonate aqueous solution to obtain solution B;

[0057] 2) Pre-body 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 value of the system at 8.5, keep warm at 60°C and continue to stir for 2h, filter and dry to obtain the precursor...

Embodiment 3

[0068] The molecular formula of the doped spinel lithium manganate electrode material of the present embodiment is LiMn 1.45 Mg 0.4 co 0.15 o 4 .

[0069] The doped spinel lithium manganese oxide 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 ratio Mn:Mg=1.45:0.4 in the molecular formula, and dissolve it in the manganese acetate aqueous solution to obtain solution A;

[0072] Solution B: the buffer potassium carbonate was prepared into a 0.2mol / L potassium carbonate aqueous solution to obtain solution B;

[0073] 2) Pre-body preparation:

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

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 薛旭金李世江侯红军杨华春罗成果罗传军李小强秦俊光叶文豪邵俊华
Owner 焦作伴侣纳米材料工程有限公司
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