Lithium manganese phosphate positive electrode material and preparation method thereof

A positive electrode material, lithium manganese phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as lattice inversion defects of lithium manganese phosphate materials, and achieve good discharge capacity and cycle performance

Active Publication Date: 2013-11-27
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that anti-site defects appear in the crystal lattice of the material easily caused by the preparation of lithium manganese phosphate cathode material by the above-mentioned hydrothermal method, the present invention proposes a novel structure lithium manganese phosphate cathode material and its preparation method

Method used

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  • Lithium manganese phosphate positive electrode material and preparation method thereof
  • Lithium manganese phosphate positive electrode material and preparation method thereof
  • Lithium manganese phosphate positive electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0034] First, weigh 115g of ammonium dihydrogen phosphate, 181g of manganese citrate, 15g of glucose and 30g of sodium dodecylbenzene sulfonate, and disperse the above raw materials in 816g of deionized water; then add the above suspension In the autoclave for hydrothermal reaction, the reaction temperature is 200°C, and the reaction time is 10 hours; after the reaction, the filter cake is filtered and washed, and the filter cake is dried at 80°C for 8 hours to obtain the square manganese phosphate precursor Body; then the precursor powder and 36.94g of lithium carbonate are fully mixed, and then sintered at high temperature for 2 hours under the protection of nitrogen atmosphere, the sintering temperature is 500 ℃, and finally natural cooling to obtain square lithium manganese phosphate cathode material.

[0035] The Shimadzu XRD-6000 X-ray powder diffractometer (XRD) was used to characterize the lithium manganese phosphate material prepared in Example 1, and the results are as f...

Embodiment 2

[0038] First weigh 126.8g of phosphoric acid (85%), 115g of manganese carbonate, 25g of glucose and 15g of Triton, and disperse the above raw materials in 1160g of deionized water; then add the above suspension to the autoclave The reaction temperature is 140°C, and the reaction time is 5 hours. After the reaction, the filter cake is filtered and washed, and the filter cake is dried at 120°C for 2 hours to obtain the prismatic manganese phosphate precursor; The precursor powder was fully mixed with 48 g of lithium hydroxide, and then sintered at a high temperature for 5 hours under the protection of a nitrogen atmosphere at a sintering temperature of 600° C., and finally cooled naturally to obtain a square lithium manganese phosphate cathode material.

[0039] The XRD and SEM spectra of the lithium manganese phosphate cathode material of Example 2 are the same as those of Example 1, and they are square particles with a particle size of 0.5 μm-1 μm. The electrochemical performance...

Embodiment 3

[0041] First weigh 132.5g of diammonium hydrogen phosphate, 173g of manganese acetate, 45g of glucose and 35g of cetyltrimethylammonium bromide, and disperse the above raw materials in 500g of deionized water; then suspend the above The liquid is added to the autoclave for hydrothermal reaction. The reaction temperature is 240°C and the reaction time is 15 hours. After the reaction, the filter cake is filtered and washed, and the filter cake is dried at 100°C for 5 hours to obtain square phosphoric acid. Manganese precursor; then the precursor powder and 68g of lithium carbonate are fully mixed, and then sintered at a high temperature for 8 hours under the protection of a nitrogen atmosphere at a sintering temperature of 700°C, and finally cooled naturally to obtain a square lithium manganese phosphate cathode material.

[0042] The XRD and SEM spectra of the lithium manganese phosphate cathode material of Example 3 are the same as those of Example 1, and they are square particles...

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Abstract

The invention relates to a lithium manganese phosphate positive electrode material and a preparation method thereof. The positive electrode material has morphology of square particles with a particle size of 0.5-1mum. The preparation method comprises the steps that: phosphorus and manganese source materials are weighed with a molar ratio of 1-1.2:1; a carbon source compound accounting for 5-15% of the total mass of the phosphorus and manganese source materials and a surfactant accounting for 1-10% of the total mass are adopted, such that a suspension liquid with a solid content of 10-50% is prepared; a hydrothermal reaction, filtration, washing, and drying are sequentially carried out, such that a manganese phosphate precursor is obtained; the precursor is sufficiently mixed with the lithium source; high-temperature sintering is carried out under the protection of a nitrogen atmosphere, and natural cooling is carried out. The material provided by the invention has a complete crystal structure, and has no impurity peak. Under 0.1C current under room temperature, an initial discharge capacity reaches 150mAh / g. The material has good circulation performance.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a lithium ion battery electrode material and preparation thereof, in particular to a lithium manganese phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion polyanionic phosphate cathode materials represented by lithium iron phosphate have the advantages of stable structure, excellent safety performance, and environmental friendliness, and have received widespread attention, especially in the fields of power batteries and energy storage. However, the 3.4V voltage platform relative to lithium metal severely limits the further improvement of the energy density of lithium iron phosphate batteries. However, the voltage platform of the lithium manganese phosphate material in the phosphate cathode material relative to the metal lithium is 4.1V, which is not only 0.7V higher than the voltage of the lithium iron phosphate material, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 陈鹏杰郭巍周明炯
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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