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Method for preparing lithium iron phosphate membrane electrode

A technology of lithium iron phosphate and thin film electrodes, which is applied in the field of preparation of lithium iron phosphate thin film electrodes, can solve problems such as expensive equipment, and achieve the effects of short synthesis process, convenient operation and simple process

Inactive Publication Date: 2014-03-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also some research groups that use laser deposition to deposit lithium iron phosphate cathode materials on stainless steel substrates, and achieve good electrochemical properties (Adv.Funct.Mater.), but this technology requires relatively expensive equipment

Method used

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  • Method for preparing lithium iron phosphate membrane electrode
  • Method for preparing lithium iron phosphate membrane electrode
  • Method for preparing lithium iron phosphate membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 6.24g of lithium dihydrogen phosphate, 4.79g of nanoscale iron oxide red (M Li :M Fe :M P =1.00:0.98:1.00), 2.0g of glucose, 0.26g of SBR, 25g of alcohol, milled for 6 hours in a planetary ball mill at a ball-to-material ratio of 4:1, to obtain a precursor slurry with a viscosity of 16000-20000Pa·s.

[0034] The slurry is coated on the surface of nickel foam according to the surface density of 2000-5000g / m2, and the coated nickel foam is baked at 80°C for 10h until it is completely dry.

[0035] After the nickel foam was rolled to 1 / 2 of the original thickness, it was sintered under a nitrogen atmosphere at a sintering temperature of 650°C for 12h. A thin film electrode synthesized at one time was prepared.

[0036] figure 1 It is the XRD pattern of the powder scraped from the electrode. It can be seen that most of the diffraction peaks of the material can be indexed as orthorhombic lithium iron phosphate cathode materials (JCPDS83-2092), and the diffraction ...

Embodiment 2

[0038] Take by weighing ammonium dihydrogen phosphate 6.291g, iron oxide red 4.9g, lithium carbonate 2.024g, (M Li :M Fe :M P =1.00:0.98:1.00) Glucose 1.82g, CMC 0.25g, deionized water 40g, ball milled in a planetary ball mill for 6h at a ball-to-material ratio of 4:1 to obtain a precursor slurry with a viscosity of 16000-20000Pa·s.

[0039] Put the slurry according to the surface density of 1200-2000g / m 2 Coated on the surface of nickel foam, bake the coated nickel foam at 100°C for 20h until completely dry.

[0040] After rolling the nickel foam to 1 / 2 of the original thickness, it was sintered under a nitrogen atmosphere at a sintering temperature of 700°C for 10 hours. A thin film electrode synthesized at one time was prepared.

Embodiment 3

[0042] Take by weighing iron phosphate 9.23g, lithium carbonate 2.024g, (M Li :M Fe :M P =1.00:1.00:1.02) 2.2g of glucose, 0.2g of PF, and 40g of alcohol were milled for 5 hours in a planetary ball mill at a ball-to-material ratio of 4:1 to obtain a precursor slurry with a viscosity of 16000-20000Pa·s.

[0043]Put the slurry according to the surface density of 1200-2000g / m 2 Coated on the surface of nickel foam, bake the coated nickel foam at 80°C for 10h until it is completely dry.

[0044] Roll the nickel foam to 1 / 2 of the original thickness, and then sinter it under a nitrogen atmosphere at a temperature of 650°C for 6-20 hours. A thin film electrode synthesized at one time was prepared.

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Abstract

The invention discloses a method for preparing a lithium iron phosphate membrane electrode. The method comprises the following steps: (1) preparing, namely preparing a lithium iron phosphate precursor into sol, gel or preparing the lithium iron phosphate precursor into slurry in a rheological phase or in a ball milling mode according to a molar ratio of Li:Fe:P of 1:(0.95-1.05):(0.95-1.05), and adding an adhesive and a thickening agent until the viscosity is 6000-25000Pa.s; (2) pouring, namely pouring the precursor into a porous foam metal at room temperature through an impregnation or press-in method; (3) drying, namely drying the membrane electrode subjected to pouring; (4) compacting, namely taking the dried membrane electrode out, and compacting by using a roller press; (5) sintering, namely sintering the compacted membrane electrode in a nitrogen atmosphere. The method is simple in process, short in synthetic process, convenient to operate, environment-friendly and high in reproducibility and can be universally used.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate thin film electrode. Background technique [0002] In 1997, J. B. Gooodenough and others synthesized LiFePO with olivine type 4 and use it as an active material in the positive electrode. The theoretical specific capacity of LiFePO4 is 170mAh / g, the discharge platform is 3.4V, the self-discharge is small, and the Li in LiFePO4 is + It can be almost 100% embedded / de-embedded; it has the advantages of long cycle life, good cycle performance, no memory effect, low price, good thermal stability, and environmental friendliness. At present, it has become one of the ideal choices for replacing lithium cobalt oxide cathode materials. Especially in the field of high-power electric tools (such as electric vehicles), lithium iron phosphate cathode active materials have good application prospects due to their excellent safety performance. [0003] In the existing industrial production pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58H01M4/62
CPCY02E60/122H01M4/136H01M4/5825H01M4/62Y02E60/10
Inventor 王康平曾晖杨续来
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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