Vanadium-doped lithium iron silicate anode material and preparation method thereof

A technology of lithium iron silicate and positive electrode materials, which is applied in the field of electrochemical power sources, can solve the problems of low lithium ion diffusion coefficient and low electronic conductivity, achieve high reversible capacity, excellent high rate performance, and reduce contact resistance.

Active Publication Date: 2015-05-13
湖北宇隆新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main bottleneck of applying lithium iron silicate to lithium-ion batteries for power batteries is to overcome the two problems of low electronic conductivity and low diffusion coefficient of lithium ions

Method used

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  • Vanadium-doped lithium iron silicate anode material and preparation method thereof
  • Vanadium-doped lithium iron silicate anode material and preparation method thereof
  • Vanadium-doped lithium iron silicate anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: First set V 2 o 5 or NH 4 VO 3 Dissolved in oxalic acid alcohol solution at 80°C, oxalic acid is used as a complexing agent and ethyl silicate hydrolysis catalyst, and then lithium salt, iron salt, and silicon source are mixed in the alcohol solution to control the molar ratio of lithium, iron, vanadium, and silicon 2:0.99:0.01:1, and added to the above solution, transferred to the reflux system at 80°C for 6h, the powder obtained after evaporating alcohol and glucose were ball milled in acetone medium for 6h, and the precursor obtained after drying powder. The precursor is sintered in a nitrogen atmosphere in a tube furnace at a temperature of 650°C and kept at a constant temperature for 10 hours. After the obtained active material powder is passed through a 300-mesh sieve, it is mixed with acetylene black and polyvinylidene fluoride (PVdF) at a mass ratio of 8:1:1. Make a slurry in N-methylpyrrolidone (NMP) medium, coat it on an aluminum foil, and make ...

Embodiment 2

[0028] Example 2. First set V 2 o 5 or NH 4 VO 3 Dissolved in oxalic acid alcohol solution at 80°C, oxalic acid is used as a complexing agent and a catalyst for the hydrolysis of ethyl silicate, and then lithium salt, iron salt, and silicon source are mixed in the alcohol solution to control the molarity of lithium, iron, vanadium, and silicon The ratio is 2:0.97:0.03:1, added to the above solution, transferred to the reflux system at 80°C for reflux for 6 hours, the powder obtained after evaporating alcohol and glucose were ball milled in acetone medium for 6 hours, and the precursor powder was obtained after drying . The precursor is sintered in a nitrogen atmosphere in a tube furnace at a temperature of 650°C and kept at a constant temperature for 10 hours. After the obtained active material powder is passed through a 300-mesh sieve, it is mixed with acetylene black and polyvinylidene fluoride (PVdF) at a mass ratio of 8:1:1. Make a slurry in N-methylpyrrolidone (NMP) m...

Embodiment 3

[0029] Example 3.: first V 2 o 5 or NH 4 VO 3 Dissolve in oxalic acid alcohol solution at 80°C, oxalic acid is used as complexing agent and catalyst for hydrolysis of ethyl silicate, and then lithium salt, iron salt, and silicon source are mixed in alcohol solution. Control the molar ratio of lithium, iron, vanadium, and silicon to 2:0.95:0.05:1, add it to the above solution, transfer it to a reflux system at 80°C for 6 hours, and ball mill the powder obtained after evaporating alcohol with glucose in an acetone medium 6h, the precursor powder was obtained after drying. The precursor is sintered in a nitrogen atmosphere in a tube furnace at a temperature of 650°C and kept at a constant temperature for 10 hours. After the obtained active material powder is passed through a 300-mesh sieve, it is mixed with acetylene black and polyvinylidene fluoride (PVdF) at a mass ratio of 8:1:1. Make a slurry in N-methylpyrrolidone (NMP) medium, coat it on an aluminum foil, and make a wor...

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Abstract

Disclosed are high-rate performance vanadium-doped lithium iron silicate anode material Li2Fel-xVxSiO4 / C and a preparation method thereof. The preparation method includes: dissolving V2O5 or NH4VO3 in oxalic acid alcohol solution, mixing lithium salt, ferric salt and silica source in alcohol solution and adding to the oxalic acid alcohol solution, transferring the mixed solution into a reflux system for reflux, obtaining powder and carbon source after alcohol is vaporized, ball milling the powder and the carbon source in acetone medium and drying to obtain precursor powder, sintering, cooling and sieving to obtain the vanadium-doped lithium iron silicate anode material. By solid-phase sintering, a layer of amorphous carbon is coated on particle surface of the material while vanadium is doped, so that resistance among particles is reduced, intrinsic conductivity and lithium ion diffusion coefficient of the material are improved, charge generation in high-rate circulation of the material can be transmitted to other lithium iron silicate crystals or current collectors timely, and voltage lagging due to blocking of transmission of the charge can be restrained.

Description

technical field [0001] The invention relates to a preparation technology of a vanadium-doped lithium iron silicate cathode material for a lithium secondary battery with high rate performance, and belongs to the field of electrochemical power sources. Background technique [0002] As an important energy storage device, lithium-ion batteries have been widely used in cameras because of their high operating voltage, high energy density, small self-discharge, long cycle life, wide temperature range, no memory effect, and outstanding safety. Traditional small battery fields such as mobile phones, notebook computers, etc. are developing towards large-scale electric vehicle power batteries and wind and solar energy storage batteries. The improvement of the performance of lithium-ion batteries mainly depends on the development and application of high-performance anode and cathode materials, in which cathode materials are the key factors affecting the safety performance, energy densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 杨学林彭刚张露露段松
Owner 湖北宇隆新能源有限公司
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