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Method for preparing zinc and barium activated lithium iron phosphate cathode material

A technology of lithium iron phosphate and cathode materials, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc.

Active Publication Date: 2014-07-16
桐乡乐维新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a consensus that lithium iron phosphate has the advantages of good safety, no pollution, stable cycle performance, high specific capacity and low price, but it also has poor conductivity and the disadvantage of lower tap density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Li2CO3 (99.73%), ZnCO3 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.00002mol Zn: 0.0003mol Ba: 1mol Fe: 1mol P After proportional mixing, high-speed ball milling in absolute ethanol (AR) medium for 20h (rotation speed 200r / min. After drying at 105-120°C, the precursor was obtained, and the dried precursor was placed in a high-temperature furnace. In a pure nitrogen (>99.5%) atmosphere, calcining at a high temperature of 500-750° C. for 24 hours to obtain the zinc and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 2

[0027] Embodiment 2 (no mixed contrast)

[0028] With Li2CO3 (99.73%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, after mixing according to the ratio of 1mol Li: 1mol Fe: 1mol P, in absolute ethanol (AR) medium, high-speed ball milling 20h (rotating speed 200r / min. After drying at 105-120°C, the precursor is obtained, and the dried precursor is placed in a high-temperature furnace, and calcined at 500-750°C for 24 hours in an ordinary pure nitrogen (>99.5%) atmosphere The obtained lithium ion cathode material.

[0029] Using the testing equipment of the prior art and the testing method of the prior art, the zinc and barium activated lithium iron phosphate positive electrode material of the above embodiment 1, and the non-doped comparison example 2 are tested and the results are as follows:

[0030] The zinc and barium activated lithium iron phosphate cathode material of Example 1 of the present invention has an initial discharge capacity of more than 155.52mAh / g; the ...

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Abstract

The invention relates to a method for preparing a zinc and barium activated lithium iron phosphate cathode material. Raw materials for preparing the zinc and barium activated lithium iron phosphate cathode material include lithium sources, ferrum sources, phosphate radical sources, zinc sources and barium sources, all the raw materials are mixed according to a proportion of 1 mol Li : 0.00002-0.00005 mol Zn : 0.0003-0.003 mol Ba : 1 mol Fe : 1 mol P, performed with ball milling at high speed with rotation speed at 200 r / min in absolute ethyl alcohol media, dried at 105-120 DEG C to obtain a precursor, and the precursor obtained through drying is placed in a high temperature furnace to be roasted for 24 hours at 500-750 DEG C high temperature in nitrogen atmosphere so as to obtain the zinc and barium activated lithium iron phosphate cathode material. Due to the fact that a small amount of doping replaces zinc and barium, control on shape and particle size of products is facilitated, stable lithium iron phosphate compound can be obtained, crystal lattice of the lithium iron phosphate compound is activated, lithium-ion diffusion coefficient is enlarged, and first discharge capacity of obtained materials reaches 160.52 mAh / g. A charge-discharge platform of the zinc and barium activated lithium iron phosphate cathode material is about 3.5 V relative to electric potential of lithium electrodes, first discharge capacity of the charge-discharge platform surpasses 168 mAh / g, and capacity of the charge-discharge platform is reduced to about 1.2% after 100 times of charge-discharge circulation. Compared with a lithium iron phosphate (LiFePO4) comparison embodiment without doping, the zinc and barium activated lithium iron phosphate cathode material is greatly improved in both specific capacity and cycle stability.

Description

technical field [0001] The method for preparing a positive electrode material of zinc and barium activated lithium iron phosphate according to the invention belongs to a method for preparing a positive electrode material of a lithium battery, and in particular relates to a method for preparing a positive electrode material for a lithium iron phosphate battery. Background technique [0002] At present, the research status of lithium iron phosphate doping modification: lithium iron phosphate LiFePO4 is non-toxic, environmentally friendly, high in safety, rich in raw materials, high in specific capacity, stable in cycle performance, and low in price. The stable discharge platform with a theoretical capacity of 3.5V, the lithium iron phosphate material has high energy density, low price, and excellent safety, and is especially suitable for power batteries. But it has a higher resistivity. Due to lithium iron phosphate, the kinetics of LiFePO4 is not good at room temperature, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 张健张新球吴润秀王晶张雅静李杰李安平李先兰严积芳黄景诚
Owner 桐乡乐维新材料有限公司
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