Microwave synthesis method for carbon coated iron phosphate of ion battery composite anode material

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficulty in synthesizing LiFePO4 powder, large electric energy, and consumption, and achieve short synthesis time, reduce energy consumption, The effect of preventing the growth of grains

Inactive Publication Date: 2007-02-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional solid-state sintering method consumes a lot of electric energy, and it is difficult to synthesize high-performance LiFePO 4 Powder

Method used

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  • Microwave synthesis method for carbon coated iron phosphate of ion battery composite anode material
  • Microwave synthesis method for carbon coated iron phosphate of ion battery composite anode material
  • Microwave synthesis method for carbon coated iron phosphate of ion battery composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Analytical pure Li 2 CO 3 and ferrous oxalate, (NH 4 ) 2 HPO 4 and citric acid in the stoichiometric ratio (Li:Fe:PO 4: C=1:1:1:1) ratio, put it into a ball mill, use acetone as a dispersant for ball milling for 3 hours, dry the mixed material, press it into a tablet, put it into an alumina crucible filled with activated carbon, and then The crucible was placed in a domestic microwave oven, an aluminum silicate board was placed under the crucible for heat insulation, the power was adjusted to medium and high grade, and the microwave irradiation time was 10 minutes. The phase analysis results (XRD) of the obtained samples are shown in Figure 1(a). It can be seen from the XRD pattern that the synthesized product is olivine-type LiFePO 4 , no impurity phase. The specific surface area test results of the obtained samples are shown in Table 1, and Table 1 also lists the specific surface area results of the samples synthesized without the organic carbon sourc...

Embodiment 2

[0023] Example 2: Analytical pure Li 2 CO 3 or lithium acetate and ferrous oxalate or ferrous acetate, (NH 4 ) 2 HPO 4 and glucose in stoichiometric ratio (Li:Fe:PO 4 : C=1:1:1:1) ratio, put it into a ball mill, use acetone as a dispersant for ball milling for 3 hours, dry the mixed material, press it into a tablet, put it into an alumina crucible filled with activated carbon, and then The crucible was placed in a domestic microwave oven, an aluminum silicate board was placed under the crucible for heat insulation, the power was adjusted to medium and high grade, and the microwave irradiation time was 10 minutes. The phase analysis result (XRD) of the obtained sample is shown in Figure 1(b). It can be seen from the XRD pattern that the synthesized product is olivine-type LiFePO 4 , no impurity phase. The specific surface area test results of the obtained samples are shown in Table 1. Using ferrous lactate had the same result.

Embodiment 3

[0024] Example 3: Analytical pure LiOH and ferrous oxalate, (NH 4 ) 2 HPO 4 and citric acid in the stoichiometric ratio (Li:Fe:PO 4 : C=1:1:1:1) ratio, put it into a ball mill, use acetone as a dispersant for ball milling for 5 hours, dry the mixed material, press it into a tablet, put it into an alumina crucible filled with activated carbon, and then The crucible was placed in a household microwave oven, an aluminum silicate board was placed under the crucible for heat insulation, the power was adjusted to medium and high grade, and the microwave irradiation time was 8 minutes. The phase of the obtained sample is olivine-type LiFePO 4 , no impurity phase.

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Abstract

The microwave synthesis process of carbon coated lithium iron phosphate as the composite positive electrode material for lithium ion cell includes the following steps: mixing material of lithium salt, organic ferrite, phosphate radical containing material and organic carbon source as coating material in the stoichiometric ratio of Li, Fe, P and C of 1 to 1 to 1 to 0.2-2 via ball milling with ethanol or acetone as dispersant for 3-6 hr; drying the mixture; tabletting; setting into alumina crucible together with active carbon and heating in microwave oven for 5-12 min. The lithium salt material may be inorganic Li2CO3 or LiOH, or organic lithium acetate, lithium lactate, lithium oxalate, lithium citrate or lithium formate; and the phosphate radical containing material may be (NH4)2HPO4 or (NH4)H2PO4.

Description

1. Technical field [0001] The invention relates to the technical field of preparation of a composite anion positive electrode material for lithium ion batteries, in particular to an optimized microwave method for directly synthesizing a composite positive electrode material for lithium ion batteries. The composite positive electrode material is carbon-coated LiFePO 4 (Lithium Iron Phosphate). 2. Background technology [0002] For half a century, with the take-off of industrialized production and the rapid economic growth, the energy crisis faced by mankind has become increasingly prominent. Governments and research institutes around the world are focusing on the development of new energy on the one hand, and on the other hand, they are paying more and more attention to the efficient storage and utilization of energy. Lithium-ion batteries have the advantages of high specific energy, small self-discharge, long cycle life, no memory effect and low environmental pollution, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 邹志刚祝梅陈红
Owner NANJING UNIV
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