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Preparation method of modified spinel lithium manganate cathode material

A type of lithium manganese oxide and positive electrode material technology, which is applied in the field of preparation of modified spinel lithium manganate positive electrode materials, can solve the problems of poor cycle performance and poor high temperature performance, and achieve fast capacity decay and high temperature performance. Excellent results with low production costs

Active Publication Date: 2015-09-02
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing lithium manganese oxide materials generally have the disadvantages of poor cycle performance and poor high temperature performance.

Method used

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  • Preparation method of modified spinel lithium manganate cathode material
  • Preparation method of modified spinel lithium manganate cathode material
  • Preparation method of modified spinel lithium manganate cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) In a wet environment, add the manganese salt solution with a concentration of 0.5-3mol / L, the NaOH solution with a concentration of 1-10mol / L and the complexing agent solution with a concentration of 0.5-200g / L into the reaction vessel together, and control it appropriately temperature, pH and stirring conditions to obtain the desired particle size of Mn 3 o 4 ;

[0023] (2) Mn obtained by the above reaction 3 o 4 (3μm), LiOH and MgO as raw materials, according to the molar ratio of Li:Mn:M of 1.10:1.75:0.15, mix them in a dry mixer for 30 minutes, and get a uniform powder;

[0024] (3) Put the mixed material into the crucible and push it into the muffle furnace for sintering. Firstly, the temperature is controlled at 750°C and kept for 6h, then the temperature is lowered to 600°C, kept for 4h, and finally cooled to room temperature, and the sintering is complete. The gas fed into the process is air, and the ventilation volume is controlled to 1.5m 3 / h;

[00...

Embodiment 2

[0030] (1) In a wet environment, add the manganese salt solution with a concentration of 0.5-3mol / L, the NaOH solution with a concentration of 1-10mol / L and the complexing agent solution with a concentration of 0.5-200g / L into the reaction vessel together, and control it appropriately temperature, pH and stirring conditions to obtain the desired particle size of Mn 3 o 4 ;

[0031] (2) Choose Mn 3 o 4 (3μm), LiOH and ZrO 2 As a raw material, the molar ratio of Li:Mn:M is 1.10:1.80:0.10 for batching, put into a dry mixer and mix for 30 minutes to obtain a uniformly mixed powder;

[0032] (3) Put the mixed material into the crucible and push it into the muffle furnace for sintering. Firstly, the temperature is controlled at 770°C and kept for 7 hours, then the temperature is lowered to 650°C, kept for 3 hours, and finally cooled to room temperature, and the sintering is complete. The gas fed into the process is air, and the ventilation volume is controlled to 1.5m 3 / h;

...

Embodiment 3

[0038] A preparation method of a modified spinel type lithium manganate cathode material, comprising the steps of:

[0039] (1) In a wet environment, add the manganese salt solution with a concentration of 0.5-3mol / L, the NaOH solution with a concentration of 1-10mol / L and the complexing agent solution with a concentration of 0.5-200g / L into the reaction vessel together, and control it appropriately temperature, pH and stirring conditions to obtain the desired particle size of Mn 3 o 4 ;

[0040] (2) Choose Mn 3 o 4 (3 μm), LiOH and NiO as raw materials, according to the chemical formula Li (1+X) mn (2-X-Y) m Y o 4 Carry out dosing, wherein M is a doping modifier, and X is 0.20, and Y is 0.25, mixed in a dry mixer or a mixer for 10 minutes;

[0041] (3) Put the material in step (2) into a crucible and push it into a muffle furnace or kiln for sintering. The sintering temperature is controlled at 650°C, the holding time is 4h, then the temperature is lowered to 500°C, ...

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Abstract

The invention discloses a preparation method of modified spinel lithium manganese oxide, an cathode material for a lithium ion cell. The preparation method comprises the following steps of metering one or more than two manganese compounds selected from MnO2, Mn3O4, Mn(OH)2 and Mn2O3, a lithium compound selected from Li2CO3 and LiOH and one or more doping agents selected from oxides or hydroxides of Cr, La, Ce, Zr, Ni, Mg, Ti, Al, Ca, V and B according to a chemical formula Li(1+X)Mn(2-X-Y)MYO4 (M is a doping modifier, X is not less than 0 and not more than 0.20 and Y is not less than 0 and not more than 0.25), mixing the materials uniformly, then carrying out sintering and surface treatment, reducing the alkali content of the sintered substance through surface treatment, controlling the alkali content in a certain range and then carrying out smashing, dispersing and grading and sieving, thus obtaining the uniformly doped lithium manganese oxide cathode material. The method is simple, the preparation processes are easy to operate and control, the production cost is low and the product performances are excellent.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion battery, in particular to a method for preparing a modified spinel type lithium manganate positive electrode material. Background technique [0002] Spinel-type lithium manganate has the advantages of abundant resources, low price, non-toxic and non-polluting. Several aspects: (1) Portable electronic equipment, such as notebook computers, video cameras, cameras, game consoles, small medical equipment, etc.; (2) Communication equipment, such as mobile phones, cordless phones, satellite communications, walkie-talkies, etc.; (3) Military equipment , such as missile ignition systems, cannon launch equipment, submarines, torpedoes, and some special military applications; (4) transportation equipment, such as electric vehicles, motorcycles, bicycles, small recreational vehicles, etc. However, the existing lithium manganese oxide materials generally have the disadv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12
CPCY02E60/10
Inventor 李兴翠潘刚平池田一崇
Owner NANTONG RESHINE NEW MATERIAL
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