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Co-doped cathode material lithium-vanadium-phosphate and application thereof

A lithium vanadium phosphate and positive electrode material technology, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of hydrogen reduction method safety hazards, uneven material particle size, unfavorable industrial production, etc. Uniform diameter, high rate discharge performance good effect

Active Publication Date: 2015-04-22
嘉善县国创新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like lithium iron phosphate, Li 3 V 2 (PO 4 ) 3 There is also the problem of low electrical conductivity, which must be overcome by certain targeted material treatments including carbon coating or element doping
Li currently reported in the literature 3 V 2 (PO 4 ) 3 The synthesis method is mainly solid-phase method including high-temperature carbothermal reduction method and hydrogen reduction method. These two methods are simple in process but have the problem of uneven particle size of the synthesized materials. In addition, hydrogen reduction method also has potential safety hazards. These factors are not conducive to industrial production

Method used

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  • Co-doped cathode material lithium-vanadium-phosphate and application thereof
  • Co-doped cathode material lithium-vanadium-phosphate and application thereof
  • Co-doped cathode material lithium-vanadium-phosphate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 0.200mol NH 4 VO 3 Separately make a 1mol / L solution, and then add 0.296mol LiAc·2H 2 O, 0.299molNH 4 h 2 PO 4 , 0.003molNH 4 Cl and 0.002molNa 2 C 2 o 4 Mix well in 50mL water, slowly inject the above mixed solution into NH 4 VO 3 In the solution, stir magnetically for 30 minutes. After mixing evenly, add a saturated oxalic acid solution with an oxalic acid content of 0.400 mol dropwise, stir magnetically for 5 hours, and then leave it to age for 12 hours to obtain a blue sol. Put the sol in a water bath at 80°C Constant temperature water bath, after most of the water is removed, a blue gel is obtained, and the gel is baked in an oven at 110°C for 10 hours to obtain a blue fluffy precursor, which is ground into a powder and placed in a tube furnace. Under a nitrogen atmosphere, the temperature was rapidly raised to 350°C at a rate of 5°C / min, and then kept at a constant temperature for 4 hours to remove NH 3 and H 2 Small molecular components such as O, and...

Embodiment 2

[0029] 0.197mol NH 4 VO 3 Separately made into a 2mol / L solution, and then 0.296mol LiAc·2H 2 O, 0.299molNH 4 h 2 PO 4 , 0.003molNH 4 Cl, 0.002molNa 2 C 2 o 4 and 0.003molCe(Ac) 3 Mix well in 50mL water, slowly inject the above mixed solution into NH 4 VO 3 In the solution, magnetically stir for 30 minutes. After mixing evenly, add a saturated oxalic acid solution with an oxalic acid content of 0.394mol to it dropwise. After magnetically stirring for 5 hours, let it stand for 12 hours to obtain a blue sol. Put the sol in a water bath at 80°C Constant temperature water bath, after most of the water is removed, a blue gel is obtained, and the gel is baked in an oven at 110°C for 10 hours to obtain a blue fluffy precursor, which is ground into a powder and placed in a tube furnace. Under a nitrogen atmosphere, the temperature was rapidly raised to 350°C at a rate of 5°C / min and then kept at a constant temperature for 4 hours to remove NH 3 and H 2 Small molecular com...

Embodiment 3

[0035] 0.195mol NH 4 VO 3 Separately make a 3mol / L solution, and then add 0.296mol LiAc·2H 2 O, 0.300molNH 4 h 2 PO 4 , 0.003molNH 4 Cl, 0.002molNa 2 C 2 o 4 and 0.005molCe(Ac) 3 Mix well in 50mL water, slowly inject the above mixed solution into NH 4 VO 3 In the solution, stir magnetically for 30 minutes. After mixing evenly, add a saturated oxalic acid solution with an oxalic acid content of 0.390 mol dropwise, stir magnetically for 5 hours, and then leave it to age for 12 hours to obtain a blue sol. Put the sol in a water bath at 80°C Constant temperature water bath, after most of the water is removed, a blue gel is obtained, and the gel is baked in an oven at 110°C for 10 hours to obtain a blue fluffy precursor, which is ground into a powder and placed in a tube furnace. Under a nitrogen atmosphere, the temperature was rapidly raised to 350°C at a rate of 10°C / min, and then kept at a constant temperature for 4 hours to remove NH 3 and H 2 O and other small mol...

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Abstract

The invention discloses a co-doped cathode material lithium-vanadium-phosphate and an application thereof. The co-doped cathode material lithium-vanadium-phosphate is prepared by using lithium resource, sodium source, vanadium source, cerium source, phosphorus source, chlorine source and an organic acid complexing agent as raw materials or using lithium resource, sodium source, vanadium source, phosphorus source, chlorine source and an organic acid complexing agent as raw materials, carrying out sol-gel process on the raw materials to obtain blue gel, drying the blue gel to obtain a blue precursor, preserving the heat of the blue precursor with the protection of chemical inert gases for 5-15 h at the temperature of 100-400 DEG C, then sintering at the temperature of 500-800 DEG C for 5-10 h, and cooling to obtain the co-doped cathode material lithium-vanadium-phosphate, wherein the lithium resource, sodium source, vanadium source, cerium source, phosphorus source, and chlorine source are fed according to the feed molar ratio of Li:Na:V:Ce:PO4:Cl being 2.96:0.04: (2-x):x:2.99:0.03, and x is no less than 0 and no larger than 0.1. The prepared co-doped cathode material lithium-vanadium-phosphate has uniform particles, high conductivity, high discharge capacity, excellent circle performance, and good high-rate discharging performance, and is suitable for being used as a lithium ion batteries cathode material.

Description

Technical field: [0001] The invention relates to a co-doped lithium vanadium phosphate positive electrode material and its application, especially a Na + , Cl - Binary co-doping or Na + 、Ce 3+ , Cl - Ternary co-doped lithium vanadium phosphate cathode material and its application in lithium-ion batteries. Background technique: [0002] In recent years, with the rapid development of industries such as electronic equipment, mobile communications and electric vehicles, the demand for lithium-ion batteries is increasing day by day, which also puts forward new requirements for lithium-ion battery cathode materials. Among the cathode materials that have been developed so far, lithium cobalt oxide (LiCoO 2 ) has excellent performance and has been widely used in small portable electronic devices, but cobalt is a combat resource, which is expensive and has poor safety performance, which limits its application in the field of electric vehicles. Other layered materials such as lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/10
Inventor 王连邦姚金翰韦硕硕
Owner 嘉善县国创新能源研究院