Preparation method of anode material LiMxNiyMn2-x-yO4

A positive electrode material and slurry technology, which is applied in the field of high-voltage positive electrode materials for lithium-ion batteries, can solve problems such as difficult process control, poor electrochemical performance, and inconsistent crystallinity, and the time to achieve high-temperature tempering treatment is short, which is conducive to industrialization The effect of high production and product consistency

Inactive Publication Date: 2012-12-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better control over the properties of materials used during battery manufacturing processes such as LCM (LiCoO2) or other types of active substances like manganese oxide. It also improves the quality of final products made from these materials compared with existing methods that use different starting materials.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to improve the efficiency at producing lightweight (L) metal oxide based secondary cells with improved capacity/power characteristics without compromising safety standards during use. Current methods involve adding expensive metals like manganese dioxyacene tungstenite powder into an alkaline solution beforehand, but these techniques result in decreased cycle life and increased risk associated with handling hazardous chemicals used therein.

Method used

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  • Preparation method of anode material LiMxNiyMn2-x-yO4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this example, LiNi 0.4 mn 1.6 o 4 The processing steps of the preparation method are as follows:

[0044] (1) Preparation of precursor slurry

[0045] According to the chemical formula LiNi 0.4 mn 1.6 o 4 The ratio of LiNO 3 3.4475g (the molar weight of Li is 0.05mol), Mn(NO 3 ) 2 4H 2 O 20.0008g (the molar weight of Mn is 0.08mol), Ni(NO 3 ) 2 ·6H 2 O 5.8162g (the molar weight of Ni is 0.02mol) is added in the reactor, then distilled water is added to form a mixed solution, and the amount of distilled water added is limited to the complete dissolution of each component; glucose 4.5g (0.025mol) is weighed and Put it into a container, add distilled water to form a glucose solution, the amount of distilled water added is limited to the complete dissolution of glucose; pour the glucose solution into the mixed solution, first stir at normal pressure and 50°C for 10h, and then heat up to 90°C ℃ and stirred until foaming (about 2 hours), to obtain the precursor

Embodiment 2

[0054] In this example, LiCr 0.2 Ni 0.4 mn 1.4 o 4 The processing steps of the preparation method are as follows:

[0055] (1) Preparation of precursor slurry

[0056] According to the chemical formula LiCr 0.2 Ni 0.4 mn 1.4 o 4 The ratio of LiNO 3 3.4475g (the molar weight of Li is 0.05mol), Mn(CH 3 COO) 2 4H 2 O 17.1563g (the molar amount of Mn is 0.07mol), Ni(NO 3 ) 2 ·6H 2 O 5.8162g (the molar weight of Ni is 0.02mol), Cr(CH 3 COO) 3 2.2913g (the molar weight of Cr is 0.01mol) is added in the reactor, and then deionized water is added to form a mixed solution. The amount of deionized water added is limited to the complete dissolution of each component; weigh 26.2675g of citric acid ( 0.125mol) and put it into a container, add deionized water to form a citric acid solution, the amount of deionized water added is limited to the complete dissolution of citric acid; pour the citric acid solution into the mixed solution, , Stir at 95°C until foaming (about 1.5 h

Embodiment 3

[0064] In this example, LiCo 0.2 Ni 0.4 mn 1.4 o 4 The processing steps of the preparation method are as follows:

[0065] (1) Preparation of precursor slurry

[0066] According to the chemical formula LiCo 0.2 Ni 0.4 mn 1.4 o 4 The matching ratio, the CH 3 COOLi 6.5990g (the molar weight of Li is 0.1mol), Mn(NO 3 ) 2 4H 2 O 35.0014g (the molar weight of Mn is 0.14mol), Ni(CH 3 COO) 2 4H 2 O 9.9544g (the molar weight of Ni is 0.04mol), Co(NO 3 ) 2 ·6H 2 O 5.821g (the molar weight of Co is 0.02mol) was added in the reactor, and then deionized water was added to form a mixed solution. The amount of deionized water added was limited to the complete dissolution of each component; 12.012g of urea was weighed ( 0.2mol) and put it into a container, add deionized water to form a urea solution, the amount of deionized water added is limited to the complete dissolution of urea; pour the urea solution into the mixed solution, Stir until foaming (about 4 hours) to obtain pr

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Abstract

The invention discloses a preparation method of an anode material LiMxNiyMn2-x-yO4. The processes are as follows: (1) metering Li, Ni, Mn and salt doped with metal M according to the ratio of a chemical formula LiMxNiyMn2-x-yO4, putting the materials into a reactor, then adding water to form mixed solution, in the chemical formula, x is smaller than or equal to 0.3 and greater than or equal to 0, and y is smaller than or equal to 0.5 and greater than 0, metering fuel according to the molar ratio of the fuel to the Li being 0.5-2.5 to 1 and putting the fuel into a container; then adding water to form fuel solution; adding the fuel solution into the mixed solution; agitating for 5-10 hours at a normal pressure at 50-80 DEG C and heating to 90-95 DEG C to agitate until foaming, or directly agitating until foaming at the normal pressure at 80-95 DEG C to obtain precursor slurry; (2) inputting the precursor slurry into a fuel tower, atomizing the precursor slurry through high-pressure air, and burning the atomized precursor slurry under the action of the fuel and compressed air, wherein the combustion product is precursor powder; (3) carrying out tempering on the precursor powder for 1-10 hours at 600-1000 DEG C at the normal pressure, and then naturally cooling the precursor powder to a room temperature to obtain the LiMxNiyMn2-x-yO4.

Description

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Claims

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Application Information

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Owner SICHUAN UNIV
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