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A kind of sodium and manganese co-doped modified lithium iron silicate positive electrode material and preparation method thereof

A technology of lithium iron silicate and cathode material, applied in the field of electrochemical power supply, can solve the problems of low lithium ion diffusion coefficient, unsuitable for mobile phone use, low voltage platform, etc., and achieves simple synthesis process, less harmful gas emissions, and improved electrical conductivity. Effect

Active Publication Date: 2016-01-20
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Batteries made of ternary materials are safer than lithium cobalt oxide batteries, but the voltage platform is too low (2.5V) and is not suitable for mobile phones (the cut-off voltage of mobile phones is generally around 3.4V)
[0003] However, lithium iron silicate also has the problems of low lithium ion diffusion coefficient and low electrical conductivity.

Method used

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  • A kind of sodium and manganese co-doped modified lithium iron silicate positive electrode material and preparation method thereof
  • A kind of sodium and manganese co-doped modified lithium iron silicate positive electrode material and preparation method thereof
  • A kind of sodium and manganese co-doped modified lithium iron silicate positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Will CH 3 COOLi·2H 2 O, FeC 2 O 4 ·2H 2 O, C 4 H 6 MnO 4 ·4H 2 O and Si (C 2 H 5 O) 4 Mix in an alcohol solution with a molar ratio of 2:0.5:0.5:1 and transfer to a reflux system at 80°C for 24 hours to obtain a powder after evaporating the alcohol. Adding 10% sucrose, ball milling with acetone as the medium for 7 hours, and drying to obtain precursor powder. The precursor is sintered in a nitrogen atmosphere at 650°C in a tube furnace and kept at a constant temperature for 10 hours. The obtained active material powder is sieved through 200 meshes and then mixed with acetylene black and polyvinylidene fluoride (PVdF) in a mass ratio of 75:15:10 The slurry is prepared in N-methylpyrrolidone (NMP) medium, coated on aluminum foil, dried, filmed and pressed to make a working electrode. Use metal lithium foil as counter electrode, polypropylene film as diaphragm, 1MLiPF 6 / (EC+DMC)(1:1) is the electrolyte assembled into a battery for constant current charge and discharge test...

Embodiment 2

[0024] NaNO 3 , CH 3 COOLi·2H 2 O, FeC 2 O 4 ·2H 2 O, C 4 H 6 MnO 4 ·4H 2 O and Si (C 2 H 5 O) 4 Mix in an alcohol solution with a molar ratio of 0.01:1.99:0.5:0.5:1 and transfer it to a reflux system at 80°C for 24 hours to obtain a powder after evaporating the alcohol. Adding 10% sucrose, ball milling with acetone as the medium for 7 hours, and drying to obtain precursor powder. The precursor is sintered in a nitrogen atmosphere at 650°C in a tube furnace and kept at a constant temperature for 10 hours. The obtained active material powder is sieved through 200 meshes and then mixed with acetylene black and polyvinylidene fluoride (PVdF) in a mass ratio of 75:15:10 The slurry is prepared in N-methylpyrrolidone (NMP) medium, coated on aluminum foil, dried, filmed and pressed to make a working electrode. Use metal lithium foil as counter electrode, polypropylene film as diaphragm, 1MLiPF 6 / (EC+DMC)(1:1) is to assemble the electrolyte into a battery for constant current charge a...

Embodiment 3

[0026] NaNO 3 , CH 3 COOLi·2H 2 O, FeC 2 O 4 ·2H 2 O, C 4 H 6 MnO 4 ·4H 2 O and Si (C 2 H 5 O) 4 After mixing in an alcohol solution with a molar ratio of 0.03:1.97:0.5:0.5:1, it is transferred to a reflux system at 80°C and refluxed for 24 hours, and the alcohol is evaporated to obtain a powder. Adding 10% sucrose, ball milling with acetone as the medium for 7 hours, and drying to obtain precursor powder. The precursor is sintered in a nitrogen atmosphere at 650℃ in a tube furnace and kept at a constant temperature for 10 hours. The obtained active material powder is sieved through 200 meshes and then mixed with acetylene black and polyvinylidene fluoride (PVdF) at a mass ratio of 75:15:10. The slurry is prepared in N-methylpyrrolidone (NMP) medium, coated on aluminum foil, dried, filmed and pressed to make a working electrode. Use metal lithium foil as counter electrode, polypropylene film as diaphragm, 1MLiPF 6 / (EC+DMC)(1:1) is to assemble the electrolyte into a battery for...

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Abstract

The invention provides a sodium and manganese codoped modified lithium ferrosilite anode material which is prepared by taking CH3COOLi*2H2O, FeC2O4*2H2O, Si(C2H5O)4, NaNO3, C4H6MnO4*4H2O and sucrose as raw materials. A preparation method comprises the concrete steps of mixing CH3COOLi*2H2O, FeC2O4*2H2O, Si(C2H5O)4, NaNO3 and C4H6MnO4*4H2O in an alcohol solution, transferring to an 80 DEG C backflow system for backflow for 24h, evaporating alcohol, obtaining powder, adding the sucrose to the powder, performing ball milling for 7h by taking acetone as a medium, drying the powder, obtaining precursor powder, performing atmosphere sintering on the precursor powder in a tube furnace, stirring the precursor powder, acetylene black and polyvinylidene fluoride into paste in an N-methyl pyrrolidone medium, applying the paste on aluminum foil, performing drying, film stamping and film pressing, and preparing the sodium and manganese codoped modified lithium ferrosilite anode material. The method is low in cost, simple and pollution-free; emission of harmful gas in a synthetic process is less; the electrochemical property of the material is excellent; and the method is suitable for industrial production.

Description

Technical field [0001] The invention relates to a sodium and manganese co-doped modified lithium iron silicate cathode material and a preparation method thereof, and belongs to the field of electrochemical power supplies. Background technique [0002] Electrode material is one of the main factors that affect the performance of lithium-ion batteries, and the cathode material plays a vital role in the future development of lithium-ion batteries. At present, the cathode materials for commercial lithium-ion batteries mainly include: lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 O 4 ), ternary materials (Li(NiCoMn)O 2 ), lithium iron phosphate (LiFePO 4 )Wait. Lithium cobalt oxide has a big drawback, that is, 80% of the cost of lithium cobalt oxide is cobalt oxide. Cobalt chloride is produced by smelting and processing of cobalt ore, and more than 90% of the world's total metal cobalt reserves are concentrated in Congo, Australia, Cuba, Zambia, Russia and other countries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58
CPCH01M4/5825H01M4/626H01M10/0525Y02E60/10
Inventor 张露露李明杨学林孙华斌
Owner CHINA THREE GORGES UNIV