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Lithium-ion power battery anode material lithium manganate and preparation method thereof

A material lithium manganese oxide, power battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of reduced electrical properties of materials, low material tap density, high degree of oxygen defects, etc., to improve lattice parameters, improve Stability and improvement of cycle performance

Active Publication Date: 2015-01-07
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, defects such as manganese dissolution and John-Teller effect of lithium manganate itself, as well as problems such as low tap density and high degree of oxygen defects caused by the material processing process, lead to a decrease in the electrical properties of the material, which seriously restricts LiMn. 2 o 4 Application as cathode material

Method used

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  • Lithium-ion power battery anode material lithium manganate and preparation method thereof
  • Lithium-ion power battery anode material lithium manganate and preparation method thereof
  • Lithium-ion power battery anode material lithium manganate and preparation method thereof

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Embodiment 1

[0031] Lithium ion power battery cathode material lithium manganate of the present embodiment, molecular formula is Li 1.05 mn 1.9 Ta 0.1 o 4 / 0.5Al 2 o 3 .

[0032] The preparation method of the lithium ion power battery positive electrode material lithium manganate of the present embodiment, the steps are as follows:

[0033] 1) Weigh lithium carbonate, manganese sulfate, and tantalum pentoxide according to the molar ratio of lithium: manganese: tantalum 1.05:1.9:0.1, mix well and ball mill at 300r / min for 5h;

[0034] 2) Carry out the high-temperature roasting of the precursor of step 1) ball milling, keep it at 600°C for 10 hours, then raise the temperature to 800°C and keep it for 20 hours at a heating rate of 3°C / min, pass through a 300-mesh sieve after cooling down;

[0035] 3) Add the sieved particles and deionized water in step 2) into the reaction kettle according to the mass ratio of 1:5, ultrasonically disperse and stir, and keep the temperature of the water ...

Embodiment 2

[0042] Lithium ion power battery cathode material lithium manganate of the present embodiment, molecular formula is Li 1.1 mn 1.8 Ta 0.2 o 4 / 1.0Al 2 o 3 .

[0043] The preparation method of the lithium ion power battery positive electrode material lithium manganate of the present embodiment, the steps are as follows:

[0044]1) Weigh lithium nitrate, manganese nitrate and tantalum nitrate according to the molar ratio of lithium: manganese: tantalum 1.1:1.8:0.2, mix well and ball mill at 400r / min for 6h;

[0045] 2) Roast the precursor of ball milling in step 1) at high temperature, hold at 500°C for 11 hours, then raise the temperature to 850°C for 30 hours at a heating rate of 4°C / min, pass through a 300-mesh sieve after cooling down;

[0046] 3) Add the sieved particles in step 2) and absolute ethanol into the reaction kettle according to the mass ratio of 1:6.5, ultrasonically disperse and stir, and keep the temperature of the water bath at 55°C;

[0047] 4) During ...

Embodiment 3

[0052] Lithium ion power battery cathode material lithium manganate of the present embodiment, molecular formula is Li 1.2 mn 1.95 Ta 0.05 o 4 / 0.1Al 2 o 3 .

[0053] The preparation method of the lithium ion power battery positive electrode material lithium manganate of the present embodiment, the steps are as follows:

[0054] 1) Weigh lithium acetate, manganese acetate, and tantalum nitrate according to the molar ratio of lithium: manganese: tantalum 1.2:1.95:0.05, mix well and ball mill at 350r / min for 8h;

[0055] 2) The precursor of step 1) ball milling is roasted at high temperature, kept at 400°C for 12 hours, then raised to 900°C for 25 hours at a heating rate of 5°C / min, and passed through a 300-mesh sieve after cooling down;

[0056] 3) Add the mixed solution of the particles sieved in step 2), deionized water and absolute ethanol to the reaction kettle at a mass ratio of 1:8, ultrasonically disperse and stir, and keep the temperature of the water bath at 53°C...

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Abstract

The invention discloses lithium-ion power battery anode material lithium manganate and a preparation method thereof. The molecular formula of the lithium manganate is Li<1+x>Mn<2-y>TayO4 / zAl2O3, wherein 0<x<=0.2, 0<y<=0.2, and 0<z<=1.0. The preparation method includes the steps of proportionally mixing a lithium source compound, a manganese source compound and a tantalum element additive and subjecting the lithium source compound, the manganese source compound and the tantalum element additive to ball milling and high-temperature roasting to obtain the lithium manganate; and dispersing the lithium manganate in a dispersing agent, adding aluminum stearate for reaction to obtain precipitate, and finally subjecting the precipitate to two-section roasting, second annealing, cooling and sieving to obtain the lithium-ion power battery anode material lithium manganate. By means of a composite metal dual-doping mechanism, doping vario-property of two elements of tantalum and lithium is performed to the lithium manganate, a John-Teller effect is inhibited, and normal temperature and high temperature cycle performances of a lithium manganate material are greatly improved; and by means of sectional roasting and multi-time annealing processes, controllability of particle diameters and specific surface areas is achieved, tap density and processing performances of the material are improved, and simultaneously, oxygen defect levels during material sintering are effectively reduced.

Description

technical field [0001] The invention relates to lithium manganate, a cathode material for lithium-ion power batteries, and a preparation method thereof, belonging to the field of cathode materials for batteries. Background technique [0002] With the continuous expansion of the application field of lithium batteries and the continuous development of new processes, the demand for lithium batteries in the world will also increase accordingly. As the development of power lithium batteries in particular has been paid more and more attention, the power supply field represented by electric vehicle applications has developed the most rapidly. However, the selection conditions for the positive electrode materials of high-power lithium-ion power batteries are harsh, and the positive electrode materials of traditional small lithium-ion batteries cannot meet the needs of power batteries. At present, lithium cobalt oxide still occupies a relatively large proportion in commercialized li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/122Y02E60/10
Inventor 李世江罗成果侯红军杨华春薛旭金罗传军郝建堂温丰源刘海霞
Owner 焦作伴侣纳米材料工程有限公司
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