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Preparation method of battery positive electrode material LiMn2O4

A battery positive electrode and manganese salt technology, which is applied in the field of electrochemistry, can solve the problems of poor uniformity and batch stability, and affect the application effect of lithium-ion batteries, and achieve good dispersion, shorten preparation time, and uniform particles.

Active Publication Date: 2013-07-31
嘉峪关大友嘉能精碳科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Of course, it is also possible to directly use Mn 3 o 4 , MnO 2 and other solid compounds as manganese sources to increase the oxidation state of manganese ions, but at this time LiMn can only be prepared by solid-phase method 2 o 4
However, the products made by the solid phase method generally have the disadvantages of poor uniformity and batch stability, which affect the performance of the material and its actual application effect in lithium-ion batteries.

Method used

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  • Preparation method of battery positive electrode material LiMn2O4
  • Preparation method of battery positive electrode material LiMn2O4
  • Preparation method of battery positive electrode material LiMn2O4

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of battery cathode material LiMn 2 o 4 The preparation method, this method comprises the following steps:

[0027] 1. Get 0.0105 mol of lithium nitrate and 0.02 mol of manganese acetate tetrahydrate, dissolve in 100 mL of ethanol solution with a mass percentage concentration of 99.9%, and obtain a homogeneous mixed solution containing lithium salt and manganese salt, wherein the concentration of manganese ions is 0.2 mol / L, at this time the color of the mixture is light red of divalent manganese ions.

[0028] 2. Fully stir the above-mentioned mixed solution, continue blowing air with a blower, and add 9mL of concentrated ammonia water with a mass percentage concentration of 25%, so that the above-mentioned mixed solution becomes a dark black solution, that is, after the divalent manganese ion is oxidized to a higher valence state. color. Calculate with the density of ammonia water being 0.91g / mL, the molar weight of ammonia water is 6 times of the molar weig...

Embodiment 2

[0034] A kind of battery cathode material LiMn 2 o 4 The preparation method, this method comprises the following steps:

[0035] 1. Get 0.0104 mol of lithium nitrate and 0.02 mol of manganese acetate tetrahydrate and dissolve them in 100 mL of ethanol with a concentration of 99.9% by mass to obtain a homogeneous mixed solution containing lithium salt and manganese salt, wherein the concentration of manganese ions is 0.2 mol / L, the color of the solution at this time is light red of divalent manganese ions.

[0036] 2. Fully stir the above mixed solution, blow air continuously with a blower, add 45 mL of concentrated ammonia water with a concentration of 25% by mass, so that the above mixed solution becomes a dark black solution, that is, after the divalent manganese ions are oxidized to a higher valence state s color. Calculate with the density of ammonia water being 0.91g / mL, the molar weight of ammonia water is now 30 times of the molar weight of manganese salt.

[0037]...

Embodiment 3

[0042] A kind of battery cathode material LiMn 2 o 4 The preparation method, this method comprises the following steps:

[0043] 1. Get 0.0515 mol of lithium acetate dihydrate and 0.1 mol of manganese acetate, dissolve in 200 mL of methanol with a mass percentage concentration of 95%, and obtain a homogeneous mixed solution containing lithium salt and manganese salt, wherein the concentration of manganese ions is 0.5 mol / L, the color of the solution at this time is light red of divalent manganese ions.

[0044] 2. Fully stir the above mixed solution, blow air continuously with a blower, add 22.4 mL of concentrated ammonia water with a mass percentage concentration of 25%, so that the above mixed solution becomes a dark black solution, that is, after the divalent manganese ions are oxidized to a higher valence state s color. Calculate with the ammonia water density being 0.91g / mL, the molar weight of the ammonia water is 3 times of the manganese salt molar weight.

[0045]...

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Abstract

The invention discloses a preparation method of a battery positive electrode material LiMn2O4. The method includes: first dissolving a lithium salt and a manganese salt that are in a mole ratio of 1:2-1.05:2 in an alcohol compound solvent, then conducting stirring and introducing air or oxygen continuously, adding concentrated ammonia water or ammonia, raising the temperature to 80-120DEG C, and carrying out roasting at 600-850DEG C in a high temperature furnace for 3-24h, thus obtaining the battery positive electrode material LiMn2O4. According to the preparation method, as pre-oxidation is conducted on manganese ions during precursor preparation, the oxidation state of manganese ions in the precursor is improved, low temperature oxidation at 350-450DEG C is not needed, and the product preparation time is greatly shortened. In addition, in the preparation process, by controlling the dosage of the concentrated ammonia water or ammonia, a product with a particle size of 20-300nm can be produced. With the method, miscellaneous metal ions are not introduced during preparation, the preparation process is simple and fast, the prepared battery positive electrode material LiMn2O4 product has a uniform particle size and good dispersity.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a battery cathode material LiMn which adopts a high-valent manganese sol-gel method. 2 o 4 method of preparation. Background technique [0002] Lithium-ion batteries are a new generation of green and renewable chemical power sources with excellent performance. At present, they are rapidly occupying mobile phones, notebook computers, small video cameras, digital cameras, power tools, electric vehicles and other application fields with incomparable advantages. . Cathode material is one of the key materials for manufacturing lithium-ion batteries. Spinel LiMn 2 o 4 With the advantages of abundant resources, high energy density, low cost, no pollution, good safety, etc., it is one of the ideal cathode materials for lithium-ion batteries. [0003] Existing LiMn 2 o 4 Most of the relevant preparation technologies require a low-temperature calcination process at about...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505
CPCY02E60/122Y02E60/10
Inventor 李世友李永立夏锋山李春雷马彦李东仁
Owner 嘉峪关大友嘉能精碳科技股份有限公司
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