Preparation method of multi-element doped lithium iron phosphate composite positive pole material

A composite positive electrode material, lithium iron phosphate technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor comprehensive performance of lithium iron phosphate, and achieve improved ion diffusion performance, good electrical conductivity and cycle stability, fast Effect of charge and discharge rate

Active Publication Date: 2013-10-09
NINGBO SHENGTENG NEW MATERIALS
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

If the coating is better, the performance of lithium iron phosphate will be better; if the coating is not good, the comprehensive performance of lithium iron phosphate will be relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The chemical formula for preparing multi-element doped lithium iron phosphate is Li 0.9 K 0.1 Fe 0.8 Zn 0.2 P 0.85 S 0.15 o 4 .

[0014] According to the molar weights of Li, K, Fe, Zn, P, S in the above chemical formula, lithium acetate, iron oxalate, ammonium dihydrogen phosphate, ammonium bisulfate, zinc nitrate and potassium carbonate were weighed, mixed and dissolved in deionized water, Form a mixed solution with a lithium ion concentration of 0.2mol / L; under nitrogen atmosphere, at 50°C, add enough Fe 3+ reduced to Fe 2+ hydrazine hydrate reducing agent, and continued to stir for 15h.

[0015] The resulting mixture is subjected to spray drying as follows: the obtained mixture is carried out through several narrow nozzles, in which fine droplets are obtained, which are dried by hot air having a temperature of 150 °C, and the spray drying results in spherical solids of 50-100 μm .

[0016] In a helium atmosphere, pre-calcine the above-mentioned spherical s...

Embodiment 2

[0018] The chemical formula for preparing multi-element doped lithium iron phosphate is Li 0.8 K 0.2 Fe 0.7 Zn 0.8 P 0.75 S 0.25 o 4 .

[0019] According to the molar weights of Li, K, Fe, Zn, P, S in the above chemical formula, lithium acetate, iron oxalate, ammonium dihydrogen phosphate, ammonium bisulfate, zinc nitrate and potassium carbonate were weighed, mixed and dissolved in deionized water, Form a mixed solution with a lithium ion concentration of 0.5mol / L; under a nitrogen atmosphere, at 70°C, add enough Fe 3+ reduced to Fe 2+ hydrazine hydrate reducing agent, continue to stir for 10h.

[0020] The resulting mixture is subjected to spray drying as follows: the obtained mixture is carried out through several narrow nozzles, in which fine droplets are obtained, which are dried by hot air having a temperature of 200 °C, and the spray drying results in spherical solids of 50-100 μm .

[0021] In a helium atmosphere, pre-calcine the above-mentioned spherical soli...

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Abstract

The invention relates to a preparation method of a multi-element doped lithium iron phosphate composite positive pole material. The chemical formula of the multi-element doped lithium iron phosphate is Li1-xKxFe1-yZnyP1-zSzO4, wherein x=0.1-0.2, y=0.2-0.3, and z=0.15-0.25. The method comprises the following steps: (1) weighing lithium acetate, iron oxalate, ammonium dihydrogen phosphate, ammonium hydrogen sulfate, zinc nitrate and potassium carbonate according to the molar weights of Li, K, Fe, Zn, P and S in the chemical formula, mixing, dissolving in deionized water to form a mixed solution, and performing nitrogen gas reduction reaction to obtain a mixture; (2) performing spray drying to obtain a spherical solid; and (3) presintering, adding starch accounting for 1-2wt% of the presintering product, uniformly grinding, and performing secondary sintering to obtain the multi-element doped lithium iron phosphate composite positive pole material. According to the prepared multi-element doped lithium iron phosphate composite positive pole material for a lithium ion battery, K, Zn and S are doped to modify the lithium iron phosphate to improve the ion diffusion performance and inhibit the aggregation phenomenon; and the surface of the lithium iron phosphate is coated with a carbon layer.

Description

Technical field [0001] The invention relates to a preparation method of a multi-element doped lithium iron phosphate composite cathode material. Background technique [0002] Lithium iron phosphate material is a cathode material for power lithium-ion batteries that has emerged in recent years and has been applied in large-scale industrialization. It has the property of intercalating and deintercalating lithium reversibly. Compared with traditional lithium-ion secondary battery cathode materials, its raw materials have wider sources, lower prices, non-toxicity, and no environmental pollution. In particular, its safety performance and cycle life are unmatched by other materials. These It is also the most important technical index of power batteries, which makes countries all over the world compete to realize industrialized production. Lithium iron phosphate has high energy density (its theoretical specific capacity is 170mAh / g, and the actual specific capacity of the product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/10
Inventor 王媛媛
Owner NINGBO SHENGTENG NEW MATERIALS
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