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LiFePO4 crystallite coated with nano metal oxide and preparation method thereof

A nano-metal and oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as unsatisfactory cycle performance and multiplier performance, low microcrystalline electronic conductivity, and slow lithium ion diffusion coefficient.

Inactive Publication Date: 2018-05-18
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of nano metal oxide M x o y Coated LiFePO 4 The preparation technology of microcrystalline lithium battery positive electrode materials aims to solve the problem of LiFePO 4 The low electronic conductivity of microcrystalline and the slow diffusion coefficient of lithium ions in it lead to unsatisfactory cycle performance and rate performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) LiFePO with a mass fraction of 96% 4 Pour 4% nano TiO 2 In the mixture precursor solution, stir at a low speed for 2 hours to form a uniform solution; then apply it on a certain heat-resistant substrate, sinter it in a vacuum furnace at 400 ° C for 2 hours, and cool it to room temperature to form nano-sized metal oxide TiO 2 Coated LiFePO 4 Microcrystalline.

[0033] (2) The electrochemical properties of the obtained samples were determined by the following method: the sample with a mass fraction of 95%, 3% carbon black SP, 2% graphite KS-15 and 5% polyvinylidene fluoride (PVDF), and It was dissolved in the solvent N-methylpyrrolidone (NMP) to form a slurry, and the slurry was uniformly coated on the aluminum foil, and the thickness of the coating was about 110 μm. Cut the coated electrode sheet to an area of ​​1cm 2 the working electrode. Vacuum-dried at 80°C for 48 hours for later use.

[0034] The test battery adopts a conventional button battery, with me...

Embodiment 2

[0036] (1) LiFePO with a mass fraction of 91% 4 Pour 9% nano Al 2 o 3 In the mixture precursor solution, stir at a low speed for 4 hours to form a uniform solution; then coat it on a certain heat-resistant substrate, sinter it in a vacuum furnace at 500°C for 7 hours, and cool it to room temperature to form a nano-metal oxide Al 2 o 3 Coated LiFePO 4 Microcrystalline.

[0037] (2) The sample with a mass fraction of 95%, 3% carbon black SP, 2% graphite KS-15 and 5% polyvinylidene fluoride (PVDF) were made into electrode sheets according to Example 1 and assembled into a battery.

[0038] Charge to 3.65V at a rate of 20mA / g (equivalent to 0.1C in terms of positive electrode), and discharge to 2.5V. The first discharge curve obtains a stable discharge voltage platform of 3.25V. The first reversible specific capacity is about 148mAh / g. The capacity retention reached 97.2% after 150 cycles. The capacity retention rate of 80 cycles at 6.0C rate reaches 90%, and the capacity r...

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Abstract

The invention discloses LiFePO4 crystallite coated with nano metal oxide and a preparation method thereof. The LiFePO4 crystallite coated with nano metal oxide is prepared from, by mass, 90-97% of LiFePO4 and 3-10% of nano-MxOy mixture, wherein M is one or more of Mg, Al, Ti, Zr, Cu, Sn and Ca, and the nano-MxOy mixture is one or more of MgO, Al2O3, TiO2, ZrO2, CuO, SnO2 and CaO. According to theLiFePO4 crystallite coated with nano metal oxide, through the compound effect of the materials, on the one hand, the charge transfer resistance can be effectively reduced, on the other hand, the direct contact between an electrolyte solution and the electrode material can be reduced, side reactions between the electrolyte solution and the electrode material are avoided, and therefore the rate performance and cycle performance of the material are significantly improved.

Description

technical field [0001] The present invention relates to a kind of portable electronic equipment, lithium ion secondary battery anode material manufacturing method and its application technology used in electric vehicle, especially relate to a kind of nanometer metal oxide coated LiFePO 4 Microcrystal preparation technology. Background technique [0002] The electrical properties of LiFePO4, the cathode material for lithium-ion batteries, can be improved by glass microcrystallization technology. In addition, metal oxides are composed of a large number of tiny crystals and glasses with a size of 100-1000nm. Changing the relative content of the two, the type of crystal phase, the size of the grain, and the interface between the crystal and the surrounding glass phase can adjust the Li + The diffusion rate of Li + The intercalation and extraction process, thereby improving the electrochemical performance of the lithium iron phosphate cathode material. [0003] Literature rese...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCH01M4/5825Y02E60/10
Inventor 李涛周会
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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