Preparation method of lithium iron phosphate cathode material pole piece

A technology of lithium ferrous phosphate and cathode material, applied in electrode manufacturing, battery electrode, vapor deposition manufacturing, etc., can solve the problem of low tap density, low volume specific energy of lithium ferrous phosphate material, hindering lithium ion and electron transfer rate and other problems, to achieve the effects of convenient preparation, simple structure and energy saving

Inactive Publication Date: 2017-06-27
ANQING NORMAL UNIV
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  • Application Information

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Problems solved by technology

However, the binder is non-conductive, which will hinder the transmission rate of lithium ions and electrons; moreover, the tap density of lithium iron phosphate material itself is low, and the use of binder and a large amount of conductive agent will make lithium iron phosphate The volume of the material is lower than the energy

Method used

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  • Preparation method of lithium iron phosphate cathode material pole piece

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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the preparation method of a lithium iron phosphate cathode material pole piece of the present embodiment comprises the following steps:

[0026] (1) Using lithium carbonate, ferrous oxalate and ammonium dihydrogen phosphate as raw materials and mixing them uniformly by grinding to obtain a raw material mixture;

[0027] (2) The raw material mixture was pre-calcined at 350°C for 2 hours in an inert atmosphere, ground into powder, and made into a circular green body with a diameter of 65mm and a thickness of 5mm under a pressure of 20MPa, and then calcined at 600°C for 10h under an inert atmosphere, and It was lowered to room temperature in 1 hour, and finally a lithium iron phosphate target was obtained;

[0028] (3) Place the prepared lithium iron phosphate target and graphite target in a high-vacuum magnetron sputtering coating equipment, using vacuum magnetron sputtering coating technology, specifically radio frequency magnetron sputtering ...

Embodiment 2

[0032] Such as figure 1 As shown, the preparation method of a lithium iron phosphate cathode material pole piece of the present embodiment comprises the following steps:

[0033] (1) Using lithium carbonate, ferrous oxalate and ammonium dihydrogen phosphate as raw materials and mixing them uniformly by grinding to obtain a raw material mixture;

[0034] (2) Pre-calcine the raw material mixture under an inert atmosphere at 320°C for 1 hour, grind it into powder, and make a circular green body with a diameter of 60 mm and a thickness of 3 mm under a pressure of 10 MPa, and then calcinate it at an inert atmosphere at 580°C for 9 hours, and Take 0.5h to cool it down to room temperature, and finally get the lithium iron phosphate target;

[0035] (3) Place the prepared lithium iron phosphate target and graphite target in a high-vacuum magnetron sputtering coating equipment, using vacuum magnetron sputtering coating technology, specifically radio frequency magnetron sputtering meth...

Embodiment 3

[0039] Such as figure 1 As shown, the preparation method of a lithium iron phosphate cathode material pole piece of the present embodiment comprises the following steps:

[0040] (1) Using lithium carbonate, ferrous oxalate and ammonium dihydrogen phosphate as raw materials and mixing them uniformly by grinding to obtain a raw material mixture;

[0041] (2) The raw material mixture was pre-calcined at 370°C for 3 hours in an inert atmosphere, ground into powder, and made into a circular green body with a diameter of 70mm and a thickness of 8mm under a pressure of 30MPa, and then calcined at 620°C for 11h under an inert atmosphere, and Take 1.5h to cool it down to room temperature, and finally get the lithium iron phosphate target;

[0042] (3) Place the prepared lithium iron phosphate target and graphite target in a high-vacuum magnetron sputtering coating equipment, using vacuum magnetron sputtering coating technology, specifically radio frequency magnetron sputtering method...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate cathode material pole piece. The method comprises the following steps: (1) taking lithium carbonate, ferrous oxalate and ammonium dihydrogen phosphate as raw materials, mixing evenly to obtain a mixture of the raw materials; (2) presintering the mixture of the raw materials at high temperature and preparing presintered raw material mixture powder by adopting the grinding method, pressing the presintered raw material mixture powder into a green body, sintering the green body at high temperature and preparing a lithium iron phosphate target material by adopting an annealing technology; and (3) using a vacuum magnetron sputtering film coating technique, regulating the parameters of the vacuum magnetron sputtering film coating process, and directly preparing a lithium iron phosphate electrode pole piece from the prepared lithium iron phosphate target material and a conductive agent. The preparation method has the advantages that the preparation method of the lithium iron phosphate cathode material pole piece which is simple in structure, convenient in manufacturing, higher in volumetric specific energy and excellent in electrochemical performances is provided.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a preparation method of a lithium iron phosphate cathode material pole piece. Background technique [0002] Lithium iron phosphate electrode material is mainly used in power lithium-ion batteries. This material has excellent safety and good cycle life, and the price is relatively low, non-toxic, and non-environmental pollution. Countries around the world are competing to research and realize its industrialization Production. [0003] The existing pole piece preparation technology of ferrous lithium ferrous phosphate electrode material is as follows: the lithium ferrous phosphate powder material is mixed and stirred with a binder (such as PVDF), a conductive agent (such as graphite) and a solvent (such as NMP) to prepare a Electrode slurry with certain viscosity and fluidity. However, the binder is non-conductive, which will hinder the transmission rate of lithium io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/04
CPCH01M4/0426H01M4/1397Y02E60/10
Inventor 白国梁罗明陈静娟王春花王钧伟董彦杰罗姣姣
Owner ANQING NORMAL UNIV
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