Fiber-ball-shaped lithium manganese phosphate anode material of lithium ion battery and preparation method of fiber-ball-shaped lithium manganese phosphate anode material

A lithium-ion battery and lithium manganese phosphate technology, which is applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of reduced production cost, low volumetric energy density, and complicated preparation process of lithium manganese phosphate, and achieve broad industrial applications Foreground, increased bulk density, high purity effect

Active Publication Date: 2012-07-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the current LiMnPO 4 Most of the preparation process has the problems of complex preparation process and high cost. At the same time, the particle size of the product is large, the shape is irregular, the bulk density is low, and the volume energy density is low, which leads to the outstanding technical problems of poor final electrochemical performance. The main purpose of the invention is to provide a method for preparing lithium manganese phosphate, a positive electrode material of a fiber-shaped lithium ion battery. This method not only has a simple process, but also can prepare high-purity fiber-shaped lithium manganese phosphate, and can greatly reduce the preparation cost of lithium manganese phosphate. , more suitable for industrial production

Method used

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  • Fiber-ball-shaped lithium manganese phosphate anode material of lithium ion battery and preparation method of fiber-ball-shaped lithium manganese phosphate anode material
  • Fiber-ball-shaped lithium manganese phosphate anode material of lithium ion battery and preparation method of fiber-ball-shaped lithium manganese phosphate anode material
  • Fiber-ball-shaped lithium manganese phosphate anode material of lithium ion battery and preparation method of fiber-ball-shaped lithium manganese phosphate anode material

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Effect test

Embodiment 1

[0057] Weigh a certain amount of lithium dihydrogen phosphate and manganese carbonate in proportion, so that the molar ratio of lithium, manganese, and phosphorus is 1:1:1, add it to the mixed solution of deionized water and absolute ethanol, and put it in a stirring ball mill Ball milling while stirring for 8 hours, then, respectively add polyvinyl alcohol with a mass percentage of 10% of the lithium manganese phosphate product as a carbon source, and add polyammonium methacrylate with a mass percentage of 3% of the total mass of raw materials as a dispersant , continue to stir the ball mill for 10 hours, transfer it to the ultrafine mill and ball mill it for 8 hours to obtain a uniform slurry, spray dry the slurry, the inlet temperature is 240°C, the outlet temperature is 65°C, and the fiber spherical precursor is obtained , the fiber spherical precursor was heat-treated in an argon atmosphere at a heating rate of 5°C / min, during the heat treatment, it was fired at a constant...

Embodiment 2

[0059] Weigh a certain amount of lithium dihydrogen phosphate, ammonium dihydrogen phosphate, lithium carbonate and manganese carbonate in proportion, so that the molar ratio of lithium, manganese and phosphorus is 1.05:1:1, add it to deionized water, ethylene glycol and In the mixed solution of water and ethanol, ball mill while stirring in a stirring ball mill for 2 hours, then, add a mixture of 0.1% cellulose and carbon black as a carbon source with a mass percentage of lithium manganese phosphate product, and add a mass percentage of raw material The mixture of polyvinyl alcohol and ammonium citrate with a total mass of 15% is used as a dispersant. After continuing to stir and ball mill for 20 hours, it is transferred to an ultrafine mill for another 1 hour to obtain a uniform slurry. The slurry is spray-dried. The temperature is 150°C, the outlet temperature is 50°C, and the fiber spherical precursor is obtained, and its scanning electron microscope photo is as follows i...

Embodiment 3

[0061] Weigh a certain amount of lithium dihydrogen phosphate, ammonium phosphate, lithium carbonate, lithium chloride, manganese carbonate and manganese acetate in proportion, so that the molar ratio of lithium, manganese and phosphorus is 1.03:1:1, add it to deionized water , dehydrated alcohol and acetone mixed solution, in the stirring ball mill while stirring ball milling 16 hours, then, add the mixture that mass percent content is lithium manganese phosphate product 20% polyethylene glycol and single crystal rock sugar as carbon source, add The mass percentage content is the mixture of polyvinyl alcohol and ammonium polyacrylate of 5% of the total mass of raw materials as a dispersant, and after continuing to stir and ball mill for 1 hour, transfer it to an ultrafine mill for another 16 hours to obtain a uniform slurry. The material was spray-dried, the inlet temperature was 350° C., and the outlet temperature was 125° C. to obtain a fiber-spherical precursor, whose scann...

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Abstract

The invention relates to preparation method for a fiber-ball-shaped lithium manganese phosphate anode material of a lithium ion battery. The preparation method includes particular steps: mixing and ball-milling a lithium source, a manganese source, a phosphorus source, a carbon source and dispersing agent to obtain uniformly mixed slurry; drying the slurry to obtain fiber-ball-shaped precursor; and realizing heat treatment for the precursor in shielding atmosphere to obtain the fiber-ball-shaped lithium manganese phosphate anode material of the lithium ion battery. The preparation method has the advantages of simplicity in process, low cost, environmental protection, convenience in operation and applicability to industrial production. In addition, the lithium manganese phosphate anode material prepared in the method is fiber-ball-shaped, the size of the lithium manganese phosphate anode material ranges from 2 micrometers to 35 micrometers, and the lithium manganese phosphate anode material is fine in crystallinity, high in purity and excellent in circulation performance and can be used as an anode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a fiber spherical lithium manganese phosphate cathode material for lithium ion batteries and a preparation method thereof, belonging to the technical field of lithium ion battery materials in the field of new energy materials. Background technique [0002] Since Padhi et al. (A K Padhi, K S Nanjundaswamy, J B Goodenough, Phospho-olivines as Positive-Electrode Materials for Rechargeable Lithium Batteries, J. Electrochem. Soc, 1997, 144(4): 1188-1194) found LiFePO with olivine structure 4 Since it has reversible charge and discharge characteristics, researchers at home and abroad have carried out in-depth research on this type of material, although LiFePO 4 The theoretical capacity is as high as 170mAh / g, but Fe 3+ / Fe 2+ The electrode potential relative to Li+ / Li is only 3.4 V, which limits the LiFePO 4 Material development. And LiMnPO with olivine structure 4 , its theoretical specific capacity is also 170mAh / g, its Mn 3+...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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