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Silver and 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 increased electronic conductivity, reduced impedance, and improved diffusion coefficient

Inactive Publication Date: 2012-03-21
张健
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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

[0024]Li2CO3 (99.73%), Ag2O (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00002mol Ag: 0.0003mol Ba: 1mol Fe: 1mol After P ratio mixing, in absolute ethanol (AR) medium, high-speed ball milling for 20h (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 an ordinary pure nitrogen (>99.5%) atmosphere, calcining at a high temperature of 500-750° C. for 24 hours to obtain the silver and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 2

[0026] Li2CO3 (99.73%), Ag2O (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00004mol Ag: 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 silver and barium activated lithium iron phosphate cathode material of the present invention.

Embodiment 3

[0028] Li2CO3 (99.73%), Ag2O (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00005mol Ag: 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 silver and barium activated lithium iron phosphate cathode material of the present invention.

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Abstract

The invention discloses a silver and barium activated lithium iron phosphate anode material. The chemical general formula of the material can be expressed as: LiAgxBay FePo4, wherein x=0.00002-0.00005, y=0.0003-0.003, the mol ratio of the Li to Ag to Ba to Fe to P is 1 mol of Li: 0.00002-0.00005 mol of Ag: 0.0003-0.003 mol of Ba: 1 mol of Fe: 1 mol of P; because a little amount of silver and barium are doped, the control of the appearance and the grain size of a product is facilitated; a stable lithium iron phosphate compound is obtained; the crystal lattice of the obtained compound is activated; the diffusion efficient of lithium ions is improved; the first discharging capacity of the lithium ions reaches 160.52 mAh / g; and the relative lithium electrode potential of a charging and discharging platform of the compound is about 3.5 V; the initial discharging capacity is over 168mAh / g; and the capacity is attenuated by about 1.2% after 100 times of charging and discharging circulation. Compared with a reference embodiment of non-doped LiFePO4, the specific capacity and the circulation stability are greatly improved.

Description

technical field [0001] The silver 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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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 张健张新球吴润秀王晶张雅静李杰李安平李先兰
Owner 张健