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A kind of preparation method of carbonitriding lithium iron phosphate material

A technology of carbonitriding and lithium iron phosphate, which is applied to electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as poor batch stability, loose contact, and unevenness

Active Publication Date: 2016-09-28
南阳逢源新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventor, through detailed research on the synthesis process, pointed out that the traditional coating process of sucrose, glucose or other carbon-containing substances is not ideal, uneven, and the contact is not tight, and there is also a virtual connection between carbon and lithium iron phosphate precursors, and even It is a way of mixing carbon, which has a new definition, and provides a preparation method of carbonitriding lithium iron phosphate material, which not only enhances the conductivity of lithium iron phosphate material, but also enhances the lattice stability and reduces the The probability of the lattice collapse during the cycle effectively enhances the cycle stability of the material. While changing the electrochemical performance of the material, it also changes the lattice strength of the material, solving the problem of poor batch stability and poor electrochemical performance of the material. , the processing performance is not good, and it can meet the higher requirements of the power battery for the positive electrode material

Method used

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  • A kind of preparation method of carbonitriding lithium iron phosphate material
  • A kind of preparation method of carbonitriding lithium iron phosphate material
  • A kind of preparation method of carbonitriding lithium iron phosphate material

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Embodiment 1

[0017] see Figure 1-6 , the preparation method of a kind of carbonitriding lithium iron phosphate material that the present invention provides, comprises the following steps: first weigh soluble phosphorus source compound, iron source compound and lithium source compound according to molar ratio, weigh the soluble phosphorus source compound The source compound, iron source compound and lithium source compound are supersaturated dissolved in deionized water or distilled water to form molecular-level phosphorus source compound precursor solution, iron source compound precursor solution and lithium source compound precursor solution respectively, and then use water The thermal method makes the phosphorus source compound precursor solution, the iron source compound precursor solution and the lithium source compound precursor solution synthesize a lithium iron phosphate crystal precursor in an autoclave, and then obtain pure phosphoric acid through the steps of solid-liquid separat...

Embodiment 2

[0020] In the method steps described in Embodiment 1, it also includes that after the carbonitriding process is completed, the carbonitrided lithium iron phosphate crystals are not taken out, and then the carbonitriding furnace temperature is set at 5-20°C The temperature is raised to 600~900°C at a rate of 1 / min, and then the temperature is kept at a constant temperature for 1~8 hours and then naturally cooled to room temperature to complete the annealing heat treatment of the lithium iron phosphate crystal after carbonitriding.

Embodiment 3

[0022] In the method steps described in Example 1, it is also included that the soluble lithium source compound is one or more of the soluble lithium source lithium nitrate, lithium hydroxide, lithium dihydrogen phosphate, lithium acetate and dilithium phosphate combination; the soluble iron source compound is one or more combinations of ferrous sulfate, ferrous phosphate, ferrous chloride; the soluble phosphorus source compound is phosphoric acid, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, One or more combination of ammonium phosphate. The preferred combination includes: the combination of lithium nitrate and ferrous sulfate plus diammonium hydrogen phosphate, and the combination of lithium acetate and ferrous chloride plus ammonium phosphate, all of which can prepare a good lithium iron phosphate crystal precursor according to the process of the present invention.

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Abstract

The invention relates to a preparation method of a carbonitrided lithium iron phosphate material. According to the preparation method, a lithium source, an iron source and a phosphorus source are synthesized into a high-purity lithium iron phosphate crystal precursor in a specific environment under the control of synthesis conditions in reaction process, the high-purity lithium iron phosphate crystal precursor is added with carbonitriding agents such as urea and methanamide, and the mixture is mixed to obtain a uniform mixture, and the mixture is subjected to carbonitriding heat treatment in vacuum. Through use of the preparation method, material electrochemical performances are changed and material mechanical properties are changed. The carbonitrided lithium iron phosphate material has good electrochemical performances, good conductivity, good crystal lattice stability, good cycle performances and high purity, and has an element ingredient ratio close to a theoretical ratio (Fe: 33.809, P: 19.161, Li: 4.229). The preparation method has simple processes and a high control degree, has good and stable batch consistency and is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the field of chemical synthetic materials, and in particular the invention relates to a method for preparing a lithium iron phosphate material with high electrical conductivity and high lattice strength by a carbonitriding process. Background technique [0002] The massive consumption of traditional energy has made energy supply increasingly scarce. A series of environmental problems brought about by the use of traditional energy, such as the current smog weather and automobile exhaust have become the number one killer of human health, etc., have seriously affected human health and living environment. The new renewable green environmental protection energy has become a kind of energy that the current society urgently needs to find. The new generation of energy utilization forms represented by electric vehicles equipped with lithium-ion secondary batteries and the storage and utilization of solar energy, wind energy, and hydroe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 孙青林汪浩魏宏政
Owner 南阳逢源新能源科技有限公司