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Nickel-barium-activated lithium iron phosphate cathode material

A lithium iron phosphate, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor conductivity and low tap density, and achieve the improvement of electronic conductivity, reduction of unit cell volume, and improvement of diffusion coefficient. Effect

Inactive Publication Date: 2012-02-08
严积芳
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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%), NiCO3 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to the ratio of 1mol Li: 0.00002mol Ni: 0.0003mol 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 nickel and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 2

[0027] Li2CO3 (99.73%), NiCO3 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00004mol Ni: 0.001mol 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 nickel and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 3

[0029] Li2CO3 (99.73%), NiCO3 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00005mol Ni: 0.003mol 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 nickel and barium activated lithium iron phosphate cathode material of the present invention.

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Abstract

The invention relates to a nickel-barium-activated lithium iron phosphate cathode material. The chemical general formula of the cathode material can be represented as LiNixBayFePO4, wherein x=0.00002-0.00005, y=0.0003-0.003, and the molar ratio of Li to Ni to Ba to Fe to P is 1mol:(0.00002-0.00005mol):(0.0003-0.003mol):1mol:1mol. As a bit of substituent nickel and barium is doped, the appearance and the particle size of the product are favorably controlled, and a stable lithium iron phosphate compound is obtained. The crystal lattice of the compound is activated, the diffusion coefficient of lithium ions is increased, and the first discharge capacity of the cathode material reaches 160.52mAh / g. The potential of a charge-discharge platform of the cathode material is about 3.5V compared with that of a lithium electrode, the initial discharge capacity exceeds 168mAh / g, and the capacity is attenuated by about 1.2% after 100 times of charge-discharge circles. Compared with the undoped LiFePO4 contrast embodiment, the cathode material has greatly increased specific capacity and cyclical stability.

Description

technical field [0001] The nickel 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 coat...

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严积芳
Owner 严积芳
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