Method of producing lithium iron phosphate with high compacted density and excellent adhesive property

A lithium iron phosphate, high-pressure compaction technology, applied to chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of inconvenient preparation, many raw material components, and insufficient reaction, and achieve excellent bonding performance and low cost. Inexpensive, good flexibility

Inactive Publication Date: 2008-04-02
天津科斯特汽车技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the above-mentioned preparation method is that there are many raw materials, which brings inco

Method used

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  • Method of producing lithium iron phosphate with high compacted density and excellent adhesive property
  • Method of producing lithium iron phosphate with high compacted density and excellent adhesive property
  • Method of producing lithium iron phosphate with high compacted density and excellent adhesive property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 2.5Kg deionized water into the ball mill jar, add 500gLiH 2 PO 4 , 380.3gFe 2 o 3 , 1.92gMgO, 40g acetylene black and 20g flake graphite. After 24 hours of wet ball milling, a uniform suspension fluid slurry was obtained, which was spray-dried to obtain a spherical solid phase precursor 1, and 500 g of solid phase precursor 1 and 50 g of sucrose were ball milled for 6 hours to obtain precursor 2. Precursor 2 in N 2 Calcined at 350°C for 24 hours under the protection of atmosphere to obtain the calcined product. The calcined product was crushed by ball milling for 24 hours, passed through a 200-mesh sieve, and then placed in N 2 Calcined at 720°C for 24 hours under the protection of atmosphere, passed through a 200-mesh sieve to obtain magnesium-doped lithium iron phosphate sample 1, and its tap density was 1.26g / cm 3 , compacted body density 2.35g / cm 3 When the electrode pads are soft. Its SEM image is shown in Figure 1, and it can be seen that the particles...

Embodiment 2

[0038] Add 2.5Kg deionized water into the ball mill jar, add 500gLiH 2 PO 4 , 384.3gFe 2 o 3 , 25g acetylene black and 20g flake graphite. After premixing, it was added into a ball mill, ball milled for 24 hours, and spray-dried to obtain solid phase precursor 1. Take 500 g of solid phase precursor and 40.0 g of sucrose, mix and crush them by ball milling for 3 hours, and obtain precursor 2. Solid phase precursor 2 in N 2 The calcined product obtained by calcining at 350°C for 12 hours under the protection of atmosphere. The calcined product was crushed by ball milling for 24 hours, and then in N 2 Calcined at 700°C for 24 hours under the protection of atmosphere, passed through a 200-mesh sieve to obtain lithium iron phosphate sample 2 without metal elements, and its tap density was 1.67g / cm 3 , compacted density 2.46g / cm 3 , the electrode sheet is soft and has good adhesion. The initial charge and discharge specific capacities are 153.3mAh / g and 133.6mAh / g, respectiv...

Embodiment 3-8

[0039] Embodiment 3-8 sees the following table:

[0040]

[0041] Note:

[0042] (1) The proportioning in the above table is the ratio of parts by weight.

[0043] (2) The specific preparation methods of Examples 3-8 can be obtained by following the requirements of the technical solution in the summary of the invention to obtain lithium iron phosphate.

[0044] (3) The carbon source in the above table is selected from one or more of phosphorus flake graphite, acetylene black, sucrose, glucose; the carbon source added for the first time is selected from flake graphite or / and acetylene black; The carbon source is selected from sucrose or / and glucose.

[0045] (4) The doping metal elements in the above table are selected from one or more of magnesium, aluminum and zirconium.

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Abstract

The present invention relates to a method preparing phosphate iron lithium with high compacted density and good cohesiveness. The technical points are as follows: firstly, ferric oxide, phosphate dihydrogen lithium, oxide or carbonate doping metal elements and carbon source are ball-milled evenly in an aqueous solution and are then sprayed and dried so that a spherical powder is obtained; the spherical powder is secondly mixed with carbon source; after ball-milling and in nitrogen atmosphere protection, the mixture is presintered for 4 hours to 48 hours in 300 DEG C to 400 DEG C; after breaking, the mixture is heat treated for 4 hours to 48 hours in a high temperature of 600 DEG C to 800 DEG C so the phosphate iron lithium with high compacted density and good cohesiveness is obtained. The present invention has the advantages that the phosphate iron lithium prepared by the present invention is good in cohesiveness when used as lithium ion battery anode, an anode plate is high in compacted density, softness and winding performance. The preparing method generates no harmful gas, costs little, is simple in process and especially suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing lithium iron phosphate with high compacted density and excellent cohesiveness. The lithium iron phosphate prepared by the invention is suitable for use as a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, MP3, UPS, cameras, and notebooks due to their high voltage, high energy density, long service life, no memory effect, and wide operating temperature range. portable devices such as computers. The application of high-capacity and high-power lithium-ion batteries in electric tools, electric bicycles, electric vehicles, etc. has just started, and the application prospects are good. [0003] Cathode materials are an important part of determining the performance of lithium-ion batteries. At present, the cathode material for large-scale commercial applications is LiC O o 2 , LiMn 2 o 4 , LiC O1 / 3 Ni 1 / 3 mn...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王茹英李月涛初旭光何立强
Owner 天津科斯特汽车技术有限责任公司
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