Spherical lithium iron phosphate anode material and preparation method thereof

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems that limit the large-scale application of lithium iron phosphate materials, are not suitable for large-scale industrial production, and the performance has not been expressed in the patent, etc. problems, to achieve the effect of convenient material capacity and rate performance, easy embedding and moving out, and excellent fluidity

Inactive Publication Date: 2013-04-24
珠海泰坦能源电子技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for lithium iron phosphate materials, there are two most prominent shortcomings: low ionic conductivity and low electronic conductivity. The two shortcomings of this material lead to low reversible capacity and low rate capacity of lithium iron phosphate materials. Limits the large-scale application of lithium iron phosphate materials
The advantage of the soft template method for preparing lithium iron phosphate is that the synthetic particles are more uniform and the purity is higher, such as Chinese Patent Publication No. CN101607703A (method for synthesizing nanometer lithium iron phosphate material by template hydrothermal method), but due to the adopted hydrothermal process , generally involves high temperature and high pressure, there are many safety problems,

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  • Spherical lithium iron phosphate anode material and preparation method thereof
  • Spherical lithium iron phosphate anode material and preparation method thereof
  • Spherical lithium iron phosphate anode material and preparation method thereof

Examples

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Embodiment 1

[0030] First, according to the method used to prepare Li (1-x) A x Fe (1-y) B y PO 4 / C stoichiometric ratio of lithium iron phosphate material particles, weigh 12wt% soft template polyacrylamide and dissolve it in 35kg water, stir for about 10 minutes to prepare solution A; then, add 6.91kg dihydrogen phosphate to solution A ammonium, 9.73kg ferric chloride, 6.13kg lithium acetate, and 19wt% glucose to obtain a mixed solution B; then use high-speed grinding to make the solution B uniform and nano-sized, and finally obtain the liquid precursor C'; then, use spray The drying equipment is used for drying to obtain the solid precursor D; the obtained dried solid precursor D is heat-treated in a high-temperature calcination furnace for 20 hours at a treatment temperature of 650° C. to finally obtain spherical lithium iron phosphate with a hollow structure. figure 1 Be the X-ray diffraction pattern of this embodiment, the material that analyzes gained is the lithium iron phosp...

Embodiment example 2

[0032] First, take 15wt% soft template agent cetyltrimethylammonium bromide (CTAB) and dissolve in the ethanol mixed solution of 30kg water and 5kg, stir about 12 minutes, make solution A; Then, add to Add 9.06kg of iron phosphate, 6.13kg of lithium acetate, and 16wt% glucose to solution A, the resulting mixed solution is B, and then use high-speed grinding to make it uniform and nano-sized, and finally obtain liquid precursor C'; then, use spray drying equipment Drying is carried out to obtain a solid precursor D; the obtained dried solid precursor D is heat-treated in a high-temperature calcination furnace for 12 hours at a treatment temperature of 700°C, and finally a spherical lithium iron phosphate with a hollow structure is obtained. The average particle size of the hollow spherical lithium iron phosphate cathode material obtained in this example is 16 μm, and its specific surface area is about 28 μm. 2 / g; the hollow spherical lithium iron phosphate positive electrode m...

Embodiment example 3

[0034] First, take 18wt% of the soft template agent polyvinyl alcohol and dissolve it in 30kg of water, stir for about 8 minutes to prepare solution A; then, add 6.91kg of phosphoric acid, 24.25kg of iron nitrate, and 4.14kg of lithium nitrate to solution A , and 12wt% glucose and 6wt% graphite, the resulting mixed solution is B, and then use high-speed grinding to make it uniform and nano-sized to obtain a liquid precursor C'; then, use a spray drying device to dry to obtain a solid precursor D; the obtained The dry solid precursor D is heat-treated in a high-temperature calcination furnace for 24 hours at a treatment temperature of 600° C. to finally obtain spherical lithium iron phosphate with a hollow structure. The average particle size of the hollow spherical lithium iron phosphate cathode material obtained in this example is about 13 μm, and its specific surface area is about 20 μm. 2 / g; the hollow spherical lithium iron phosphate cathode material also shows excellent ...

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Abstract

The invention discloses a spherical lithium iron phosphate anode material and a preparation method thereof and belongs to the field of lithium ion battery anode material preparation. The preparation method utilizes a soft template method to realize synthesis of the hollow spherical lithium iron phosphate anode material (Li(1-x)Ax Fe(1-y)ByPO4/C) having high performances. The preparation method comprises the following steps of dissolving a soft-template agent in an aqueous solution, preparing a solution comprising a lithium-containing compound, an iron-containing compound, a phosphorous-containing compound and a carbon-containing compound which are fully mixed in an atomic level, adding a doping reagent into the solution, uniformly mixing to obtain a precursor mixed solution having good uniformity, wherein the adopted carbon-containing compound has a protective effect and a lithium iron phosphate particle coating effect in follow-up reactions and greatly improves anode material conductivity, carrying out spray drying treatment on the uniform precursor mixed solution with granulation and precursor drying to obtain a solid precursor having a uniform spherical structure, and carrying out heat treatment to remove the soft template and to obtain the spherical lithium iron phosphate anode material having a hollow structure.

Description

【Technical field】 [0001] The invention relates to the field of new energy materials, in particular to a spherical lithium iron phosphate cathode material and a preparation method thereof. 【Background technique】 [0002] Energy and environment are the two major themes of human survival and development. Entering the 21st century, with the rapid development of science and technology and the increasing frequency of human activities, the consumption of earth resources has also increased sharply, especially the massive consumption of fossil energy (coal, oil, natural gas) is on the verge of exhaustion. Energy issues have become the primary issue for the future development of mankind. For this reason, human beings are looking for various alternative energy sources, especially clean energy sources, such as solar energy, wind energy, biomass energy, etc. However, how to effectively store and utilize these new energy sources has become an urgent problem to be solved. Lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 刘又勇孙实文
Owner 珠海泰坦能源电子技术有限公司
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