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Preparation method of lithium iron phosphate, lithium iron phosphate and lithium ion battery

A technology of lithium iron phosphate and phosphorus source, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low ion conductivity and electronic conductivity of lithium iron phosphate, irregular morphology of lithium iron phosphate particles, and particle size distribution. Non-uniformity and other problems, to achieve the effect of improving electrochemical performance, good electrochemical performance, and wide use

Inactive Publication Date: 2017-11-17
NORTHERN ALTAIR NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own structure, the ionic conductivity and electronic conductivity of lithium iron phosphate are low, which is only suitable for charging and discharging at low current density, and the specific capacity decreases when charging and discharging at high rates, which limits the application of this material.
[0004] At present, a large number of researches on the modification of lithium iron phosphate have been carried out at home and abroad to improve the conductivity of lithium iron phosphate, mainly including the preparation of nano-scale LiFePO 4 , Preparation of porous LiFePO 4 , metal ion doping and other methods, however, the lithium iron phosphate prepared by the above method still has a lot of room for improvement in electronic conductivity and ion conductivity, and at the same time, the particle morphology of the currently prepared lithium iron phosphate is irregular, and Uneven particle size distribution

Method used

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  • Preparation method of lithium iron phosphate, lithium iron phosphate and lithium ion battery
  • Preparation method of lithium iron phosphate, lithium iron phosphate and lithium ion battery
  • Preparation method of lithium iron phosphate, lithium iron phosphate and lithium ion battery

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preparation example Construction

[0036] According to one aspect of the present invention, a kind of preparation method of lithium iron phosphate is provided, and this preparation method comprises the following steps:

[0037] (a) uniformly mixing the iron source, phosphorus source, lithium source and carbon source, and calcining under a protective atmosphere to obtain a calcined product;

[0038] (b) after grinding the calcined product, drying;

[0039] (c) Calcining the dried material again under a protective atmosphere to obtain lithium iron phosphate.

[0040] The invention provides a preparation method of lithium iron phosphate, which comprises mixing iron source, phosphorus source, lithium source and carbon source, calcining, grinding, drying and then calcining again to obtain lithium iron phosphate. By adopting the above-mentioned specific process, the particles of the prepared lithium iron phosphate are spherical, the particle size is at the micron or nanometer level, the particle size is uniform and ...

Embodiment 1

[0080] A preparation method for lithium iron phosphate, comprising the following steps:

[0081] (a) mix the iron source, phosphorus source, lithium source and carbon source evenly, put them into an atmosphere furnace and perform calcining under a protective atmosphere of helium to obtain a calcined product;

[0082] Among them, the iron source is iron oxide, the phosphorus source is diammonium hydrogen phosphate, the lithium source is lithium hydroxide, the carbon source is sucrose, the carbon source accounts for 0.5% of the total weight of the iron source, phosphorus source and lithium source, and the calcination temperature is 750°C , the calcination time is 8h;

[0083] (b) After the calcined product is wet ground, it is dried in an oven at a temperature of 110° C. for 12 hours;

[0084] Among them, the time of wet grinding is 3h, and the solvent of wet grinding is deionized water;

[0085] (c) Calcining the dried material again in a protective atmosphere of helium at a ...

Embodiment 2

[0087] The preparation method of lithium iron phosphate provided in this example is the same as that of Example 1, except that graphene is used as the carbon source in step (a), and the specific steps can refer to Example 1.

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Abstract

The invention provides a preparation method of lithium iron phosphate, lithium iron phosphate and a lithium ion battery, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps: mixing an iron source, a phosphorus source, a lithium source and a carbon source, calcinikng, grinding, drying, and then carrying out calcinations again so as to obtain lithium iron phosphate. By adopting the specific working procedures, the particles of prepared and obtained lithium iron phosphate are similarly spherical, the particle size is in a micrometer or nanometer level, the granularity is uniform and controllable, and a uniform and firm carbon cladding layer is formed on the surface of lithium iron phosphate more easily through the similarly spherical shape, so that a complete electric conduction network can be formed, the electric conductivity of lithium iron phosphate is obviously improved, and the electrochemical performance of lithium iron phosphate is improved. The invention also provides lithium iron phosphate obtained by adopting the preparation method, lithium iron phosphate is similarly spherical, the granularity is uniform and controllable, and the carbon cladding layer on the surface of lithium iron phosphate is uniform and firm, and the complete electric conduction network can be formed, so that lithium iron phosphate has good electrochemical performance.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, and specifically to a preparation method of lithium iron phosphate, lithium iron phosphate and lithium ion batteries. Background technique [0002] Lithium-ion batteries mainly contain three parts: positive electrode, electrolyte and negative electrode. Among them, lithium-ion battery cathode materials are the key factors that determine the battery's electrochemical performance, safety performance, energy density, and price. Currently, there are many cathode materials for lithium-ion batteries, such as cobalt-based cathode materials, nickel-based cathode materials, manganese-based cathode materials, lithium iron phosphate cathode materials, etc. [0003] Among them, lithium iron phosphate (LiFePO 4 ) The theoretical capacity of the cathode material is 170mAh / g, and the reversible charge and discharge specific capacity is high. At the same time, it has the advantages of wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 周自娜成信刚雷磊杜孟衣赵腾飞杨国凯
Owner NORTHERN ALTAIR NANOTECH CO LTD
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