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Preparation method of lithium manganese oxide spinel positive material

A positive electrode material, spinel technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of limiting wide application, battery capacity attenuation, poor compatibility, etc., to shorten the reaction time, reduce volatilization loss, The effect of high reaction temperature

Inactive Publication Date: 2013-07-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor compatibility with the electrolyte, the Jahn-Teller effect is prone to occur during deep charge and discharge, resulting in distortion, causing the capacity of the battery to decay rapidly, and the general cycle life is less than 300 times, thus limiting its commercialization. widely used

Method used

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  • Preparation method of lithium manganese oxide spinel positive material
  • Preparation method of lithium manganese oxide spinel positive material
  • Preparation method of lithium manganese oxide spinel positive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Dissolve 1g of cobalt nitrate and 1.5g of aluminum nitrate in 20ml of water, add 0.5g of zirconia and 1g of lithium fluoride to ultrasonically disperse for 10 minutes, then mix with 100g of electrolytic MnO 2 After mixing, dispersing evenly and drying, heating at 500°C for 5 hours, and cooling to obtain crystal lattice doped with cobalt, aluminum, zirconium and fluorine, and containing MnO 2、 mn 2 o 3 Mixed crystal structure, Mn 3+ , Mn 4+ Coexisting manganese oxide precursors.

[0032] (2) with LiCO 3 The lithium source and the doped manganese oxide precursor obtained in (1) are mixed according to an excess of 3% Li, and 0.5 g of lithium fluoride is added at the same time.

[0033] (3) Mix the raw materials in (2) with ethanol as a dispersant, mix and ball mill for 3 hours according to the ratio of 1:1 ball to material, then dry it, then place it in a high-temperature furnace for calcination at a constant temperature of 600°C for 12 hours, and cool it to room ...

Embodiment 2

[0036] (1) Dissolve 1.2g of magnesium nitrate in 20ml of water, add 0.5g of nano-alumina and 0.5g of lithium fluoride to ultrasonically disperse for 10 minutes, then mix with 100g of electrolytic MnO 2 After mixing, dispersing evenly and drying, heat at 700°C for 2 hours, and after cooling, obtain crystal lattice doped with magnesium, aluminum and fluorine, and containing MnO 2、 mn 2 o 3 Mixed crystal structure, Mn 3+ , Mn 4+ Coexisting manganese oxide precursors.

[0037] (2) Lithium hydroxide is used as the lithium source and the doped manganese oxide precursor obtained in (1) is mixed with an excess of 5% Li, and 1 g of lithium fluoride is added at the same time.

[0038] (3) Mix the raw materials in (2) with ethanol as a dispersant, mix and ball mill for 1 hour according to the ratio of 1:3 ball to material, then dry it, then place it in a high-temperature furnace for calcination at a constant temperature of 700°C for 5 hours, and cool it to room temperature to obtain ...

Embodiment 3

[0041] (1) Add 1g of cobalt oxide, 0.5g of alumina and 1g of lithium fluoride to 20ml of water for ultrasonic dispersion for 20 minutes and mix with 100g of electrolytic MnO 2 After mixing, dispersing evenly and drying, heat at 750°C for 4 hours, and after cooling, a crystal lattice doped with cobalt, aluminum and fluorine, and containing MnO is obtained. 2、 mn 2 o 3 Mixed crystal structure, Mn 3+ , Mn 4+ Coexisting manganese oxide precursors.

[0042] (2) with LiCO 3 The lithium source and the doped manganese oxide precursor obtained in (1) are mixed according to an excess of 4% Li, and 1 g of lithium fluoride is added at the same time.

[0043] (3) Mix the raw materials in (2) with ethanol as a dispersant, mix ball mill at a ratio of 1:1 and ball mill for 5 hours, then dry them in a high-temperature furnace at a constant temperature of 700°C for 12 hours, cool to room temperature, and obtain high-magnification , High cycle performance spinel structure lithium manganate...

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Abstract

The invention relates to a preparation method of a lithium manganese oxide spinel positive material, and particularly relates to a preparation method of a lithium manganese oxide spinel positive material with high rate and high cycle performance, which belongs to the field of energy materials. The preparation method comprises the steps of preprocessing manganese dioxide which is taken as raw materials to obtain a lattice-doped precursor containing one, two or three of manganese dioxide, manganese sesquioxide and trimanganese tetroxide, and controlling the valence state of the precursor to improve the stability and the performance of the lithium manganese oxide structure.

Description

technical field [0001] The invention relates to a preparation method of lithium manganate cathode material, in particular to a preparation method of spinel lithium manganate cathode material with high rate and high cycle performance, belonging to the field of energy materials. Background technique [0002] With the development of the world economy, energy, information, and environment have become the three major themes of scientific and technological development, among which the issue of energy has attracted widespread attention from all over the world. Lithium-ion batteries are secondary batteries developed on the basis of lithium batteries. It has many advantages such as high working voltage, high specific energy, small size, light weight, and long life. Provide electrical energy. [0003] Since the early 1990s, LiCoO 2 The secondary battery as the positive electrode material has been commercialized, but its popularization and use are limited due to the shortage of coba...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/10
Inventor 张云刘文静黄丝丝
Owner SICHUAN UNIV
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