Calcium and barium activated lithium iron phosphate positive pole material

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: 2012-02-15
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

[0026]Li2CO3 (99.73%), CaCO3 (99.5%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.002mol Ca: 0.0003mol Ba: 1mol Fe: 1mol P After proportional mixing, high-speed ball milling in absolute ethanol (AR) medium for 20h (rotation speed 200r / mimn. 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 calcium and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 2

[0028] Li2CO3 (99.73%), CaCO3 (99.5%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to the ratio of 1mol Li: 0.004mol Ca: 0.001mol Ba: 1mol Fe: 1molP After mixing, high-speed ball milling in absolute ethanol (AR) medium for 20h (rotation speed 200r / mimn. After drying at 105-120°C, the precursor was obtained, and the dried precursor was placed in a high-temperature furnace. In a nitrogen (>99.5%) atmosphere, calcining at a high temperature of 500-750° C. for 24 hours to obtain the calcium and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 3

[0030] Li2CO3 (99.73%), CaCO3 (99.5%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw material, according to 1mol Li: 0.005mol Ca: 0.003mol Ba: 1mol Fe: 1molP ratio After mixing, high-speed ball milling in absolute ethanol (AR) medium for 20h (rotation speed 200r / mimn. After drying at 105-120°C, the precursor was obtained, and the dried precursor was placed in a high-temperature furnace. In a nitrogen (>99.5%) atmosphere, calcining at a high temperature of 500-750° C. for 24 hours to obtain the calcium and barium activated lithium iron phosphate cathode material of the present invention.

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PUM

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Abstract

The invention discloses a calcium and barium activated lithium iron phosphate positive pole material. The general formula of the positive pole material is LiCaxFeyPO4, wherein x=0.002-0.005, y=0.0003-0.003, the mol ratio of Li, Ca, Ba, Fe and P is 1.0:(0.002-0.005):(0.0003-0.003):1:1; as the doping of a small amount of Ca and Ba for substitution, the feature and the particle diameter of a product are effectively controlled, thereby obtaining a stable lithium iron phosphate compound, the crystal lattice of the lithium iron phosphate compound is activated, the lithium ion diffusion coefficient is improved, and the loading capacity achieves 155.52 m A h / g in the first time; a charge-discharge platform relative to lithium electrode potential is around 3.5V, the initial discharge capacity exceeds 164 m A h / g, and the capacity decays around 3.0% after charging and discharging are circled for 100 times; compared with the unmixed LiFePO4 comparing embodiment, the specific capacity and the cyclical stability are greatly improved; and as the price of Ba is over hundreds of times lower than that of Li, the manufacturing cost can be reduced by more than 10 times.

Description

technical field [0001] The calcium 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 coa...

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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