Preparation method of cobalt/barium activated lithium iron phosphate anode material

A technology of lithium iron phosphate and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as low tap density and poor conductivity, and achieve the effects of improving electrical conductivity, electronic conductivity, and diffusion coefficient

Active Publication Date: 2012-03-21
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

Example Embodiment

[0024] Example 1

[0025] Li2CO3 (99.73%), CoC2O4 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00002mol Co: 0.0003mol Ba:1mol Fe:1mol P After proportioning and mixing, in anhydrous ethanol (AR) medium, high-speed ball milling for 20h (rotating speed 200r / mimn. After drying at 105-120℃, the precursor is obtained, and the precursor obtained by drying is placed in a high-temperature furnace. In a pure nitrogen (>99.5%) atmosphere, it is calcined at a high temperature of 500-750 DEG C for 24 hours to obtain the cobalt and barium activated lithium iron phosphate cathode material of the present invention.

Example Embodiment

[0026] Example 2

[0027] Li2CO3 (99.73%), CoC2O4 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00004 mol Co: 0.001mol Ba:1mol Fe:1mol P After proportioning and mixing, in anhydrous ethanol (AR) medium, high-speed ball milling for 20h (rotating speed 200r / mimn. After drying at 105-120℃, the precursor is obtained, and the precursor obtained by drying is placed in a high-temperature furnace. In a pure nitrogen (>99.5%) atmosphere, it is calcined at a high temperature of 500-750 DEG C for 24 hours to obtain the cobalt and barium activated lithium iron phosphate cathode material of the present invention.

Example Embodiment

[0028] Example 3

[0029] Li2CO3 (99.73%), CoC2O4 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00005mol Co: 0.003mol Ba:1mol Fe:1mol P After proportioning and mixing, in anhydrous ethanol (AR) medium, high-speed ball milling for 20h (rotating speed 200r / mimn. After drying at 105-120℃, the precursor is obtained, and the precursor obtained by drying is placed in a high-temperature furnace. In a pure nitrogen (>99.5%) atmosphere, it is calcined at a high temperature of 500-750 DEG C for 24 hours to obtain the cobalt and barium activated lithium iron phosphate cathode material of the present invention.

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Abstract

The invention relates to a preparation method of a cobalt/barium activated lithium iron phosphate anode material, which comprises the following steps: mixing a lithium source, an iron source, a phosphate radical source, a cobalt source and a barium source at a ratio of 1mol Li : (0.00002-0.00005) mol Co : 0.0003 mol Ba : 1mol Fe : 1 mol P, performing high-speed ball milling in an anhydrous alcohol medium at a rotation speed of 200 r/min for 20 h, drying at 105-120 DEG C to obtain a precursor, placing the precursor obtained via the drying into a high-temperature furnace, and performing high-temperature calcination in a nitrogen atmosphere at 500-750 DEG C for 24 h to obtain the cobalt/barium activated lithium iron phosphate anode material. The doping of a small amount of cobalt/barium is helpful for controlling the morphological form and particle size of product and obtaining stable lithium iron phosphate compound, the crystal lattice of the cobalt/barium activated lithium ironphosphate anode material is activated so as to improve the lithium ion diffusion coefficient, and the initial discharge capacity of the obtained material is up to 160.52 mAh/g; the lithium electrode potential of the charging/discharging platform for the method is about 3.5 V, the initial discharging capacity is over 168 mAh/g, and the capacity after 100 cycles of charging/discharging is attenuated by about 1.2%; and comparing with the non-doped LiFePO4 comparison example, the specific capacity and cycle stability of the obtained material are greatly improved.

Description

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Claims

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Application Information

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Owner 桐乡乐维新材料有限公司
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