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Uniformly dispersed electrode material and preparation method thereof

A technology of electrode materials and composite materials, applied in the field of lithium-ion battery electrode materials and their preparation, can solve problems such as difficulty in ensuring product consistency and stability

Active Publication Date: 2013-02-06
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method disclosed in this invention still obtains lithium manganese phosphate synthesized by a conventional solid-phase method, and it is also difficult to ensure the consistency and stability of the product.

Method used

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  • Uniformly dispersed electrode material and preparation method thereof
  • Uniformly dispersed electrode material and preparation method thereof
  • Uniformly dispersed electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Weigh 1 part of ferrous oxalate, add 3-6% carbon source of iron source mass and EFKA-5010 of 1-5% carbon source mass at the same time, and then add one of the compounds of magnesium, manganese, chromium, nickel, aluminum or more, these compounds account for 0.02%-0.05% of the total iron source, add ethanol and deionized water (3:2 volume ratio) mixed solvent, stir and ball mill for 2h; weigh 1 part of lithium dihydrogen phosphate, and at the same time Add SN-5040 with 1-5% carbon source mass, add ethanol and deionized water (3:2 volume ratio) mixed solvent, stir for 1 hour; slowly drop lithium dihydrogen phosphate solution into ferrous oxalate solution, At the same time, the precursor was continuously stirred and spray-dried to obtain the precursor. The lithium iron phosphate precursor was sintered at 700° C. for 7 hours under a high-purity nitrogen atmosphere, and then taken out after being cooled. The product is pulverized, fused, and passed through a 200-mesh sieve t...

Embodiment 2

[0096]Weigh 2 parts of iron phosphate, add 3-6% carbon source of iron source mass and dispersant CNF of 1-5% carbon source mass at the same time, then add one of the compounds of magnesium, manganese, chromium, nickel, aluminum or Various, these compounds accounted for 0.02%-0.05wt% of the total iron source, added to deionized water solvent, stirred and ball milled for 2 hours; weighed 1-3% of lithium carbonate mass sodium carboxymethylcellulose (CMC), added to In deionized water, stir until CMC is completely dissolved, then take 1 part of lithium carbonate, EFKA-5010 with 1-5% carbon source mass, add it to the mixed solvent of CMC and deionized water, stir for 1 hour; slowly drop the ferric phosphate slurry into Lithium carbonate suspension, stirring continuously at the same time, and spray drying to obtain the precursor. The lithium iron phosphate precursor was sintered at 750°C for 10 hours in a high-purity nitrogen-hydrogen mixed gas atmosphere containing 5% hydrogen, and t...

Embodiment 3

[0098] Weigh 1 part of vanadium pentoxide, and add 3-10% of the mass of the vanadium source as a carbon source and 0.5-5% of the mass of the carbon source as dispersing anti-sedimentation agent DA-50, and 3-7% of the mass of the vanadium source as polyethylene Alcohol, then add one or more of magnesium, manganese, chromium, nickel, aluminum compounds, these compounds account for 0.02%-0.05% of the total iron source, add to the solvent of deionized water, stir ball mill for 2h; weigh 3 Lithium dihydrogen phosphate, add 0.5-5% carbon source quality dispersant CS at the same time, add ethanol and deionized water (volume ratio: 8:2) mixed solvent, stir for 1h; drop the lithium dihydrogen phosphate emulsion slowly Put it into the vanadium pentoxide suspension, stir continuously, and spray dry to obtain the precursor. The lithium iron phosphate precursor was sintered at 750°C for 10h in a high-purity nitrogen-hydrogen mixed gas atmosphere containing 5% hydrogen, and then taken out af...

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Abstract

The invention discloses an electrode material. The chemical composition of the electrode material is LixMe1yMe2a(RO4)z, wherein Me1 is one of or composition of at least two of Mn, Fe, Ni, Co or V, Me2 is one of or composition of at least two of Mg, Mn, Cr, Ni or Al, R refers to P or / and Si, 1< / =x< / =4, 1< / =y< / =3, 1< / =z< / =5, and 0< / =a< / =0.2. The invention further discloses a preparation method of the electrode material. Small particles in solution uniformly wrap surfaces of large particles under the interaction of positive and negative charges of anionic dispersants and cationic dispersants, self-aggregation of the particles is avoided, the wrapping state cannot be destroyed in a precursor forming process, and the obtained electrode material is fine and uniform in crystal particle and good in electrical conductivity and cycle performance and is coated with a thin carbon layer on the surface.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a uniformly dispersed lithium-ion battery electrode material and a preparation method thereof. Background technique [0002] In recent years, with the increasing awareness of environmental and energy issues, people have paid more and more attention to the development of secondary batteries, especially favoring secondary batteries with good safety, light weight, high capacity, high energy and long life. Due to a series of advantages, lithium-ion batteries are widely used in the power supply of portable devices such as mobile phones and notebook personal computers. In recent years, they have developed rapidly in the fields of electric vehicles, hybrid power, and electric tools. [0003] Phosphate compounds with olivine structure in lithium ion batteries, such as lithium iron phosphate, lithium cobalt phosphate, lithium nickel phosphate, lithium manganese phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 岳敏刘祥吴强王思敏黄友元贺雪琴
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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