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Lithium iron phosphate anode material with activating aluminum and barium

A lithium iron phosphate, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low tap density and poor conductivity, and achieve the effects of improving electronic conductivity, reducing impedance and reducing unit cell volume.

Inactive Publication Date: 2012-03-14
张雅静
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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

[0025]Li2CO3 (99.73%), Al (OH) 3 (99.5%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.002mol Al: 0.0003mol Ba: 1mol After mixing Fe: 1mol P ratio, in absolute ethanol (AR) medium, high-speed ball milling (rotation speed 200r / mimn) for 20h. After drying at 105-120°C, the precursor was obtained, and the dried precursor was placed in a high-temperature furnace In an atmosphere of ordinary pure nitrogen (>99.5%), calcining at a high temperature of 500-750° C. for 24 hours to obtain the aluminum and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 2

[0027] Li2CO3 (99.73%), Al (OH) 3 (99.5%), BaCO3 (99.8%) FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.004mol Al: 0.001mol Ba: 1mol Fe : After mixing in the ratio of 1mol P, in absolute ethanol (AR) medium, high-speed ball milling (rotating speed 200r / mimn) 20h (speed 200r / mimn. After drying at 105-120°C, the precursor is obtained, and the precursor obtained by drying is placed in a high-temperature furnace , in an ordinary pure nitrogen (>99.5%) atmosphere, calcined at a high temperature of 500-750° C. for 24 hours to obtain the aluminum and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 3

[0029] Li2CO3 (99.73%), Al (OH) 3 (99.5%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.005mol Al: 0.003mol Ba: 1mol After mixing Fe: 1mol P ratio, in absolute ethanol (AR) medium, high-speed ball milling (rotation speed 200r / mimn) for 20h. After drying at 105-120°C, the precursor was obtained, and the dried precursor was placed in a high-temperature furnace In an atmosphere of ordinary pure nitrogen (>99.5%), calcining at a high temperature of 500-750° C. for 24 hours to obtain the aluminum and barium activated lithium iron phosphate cathode material of the present invention.

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PUM

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Abstract

The invention provides a lithium iron phosphate anode material with activating aluminum and barium, wherein the chemical formula can be expressed as follows: LiAlxBayFePO4, wherein X=0.002-0.005, and y=0.0003-0.003; the mol ratio of Li, Al, Ba, Fe and P is as follows: 1 mol of Li: 0.002-0.005 mol of Al: 0.0003-0.003 mol of Ba: 1 mol of Fe: 1 mol of P; after a small quantity of substituted aluminum and barium are doped, the shape and the grain diameter of a product can be preferably controlled, a stable lithium iron phosphate chemical compound can be obtained, the crystal lattice can be activated, the diffusion coefficient of lithium ions can be improved, and the first discharge capacity can reach 155.52mAh / g; the electric potential of a charge / discharge platform is about 3.5V relative to a lithium electrode, the initial discharge capacity exceeds 164mAh / g, and the capacity is attenuated by about 3.0% after 100 times of charge / discharge circulation; compared with the embodiment which is not doped with LiFePO4, the specific capacity and the cyclical stability can be greatly improved; and as the price of Ba is lower than the price of Li by more than 100 times, the production cost can be reduced by more than 10 times.

Description

technical field [0001] The aluminum and barium activated lithium iron phosphate positive electrode material of the invention belongs to a lithium battery positive electrode material, in particular to a lithium iron phosphate battery positive electrode material. 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, and the rate performance is extremely poor. Researchers at home and abroad have used methods such as co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 张健张新球吴润秀王晶张雅静李杰李安平李先兰
Owner 张雅静
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