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Spherical anode materials for lithium ion batteries connected by ultramicro particles and preparation method thereof

A technology for lithium-ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc. It can solve the problems of difficult uniform dispersion of electrode slurry, unfavorable high-rate discharge, and easy aggregation of particles, so as to increase the effective contact specific surface area , prevent random agglomeration, uniform particle size distribution

Inactive Publication Date: 2011-03-23
黄兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, reducing the particle size to prepare nano-scale materials helps to shorten the diffusion distance of lithium ions, but the ultrafine particles prepared by high-temperature solid-phase method are usually irregular in shape, and the particles are easy to agglomerate. It is not easy to disperse evenly, and requires more adhesives, which leads to large polarization in the local area of ​​the pole piece during the charge and discharge process, which is not conducive to high-rate discharge

Method used

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  • Spherical anode materials for lithium ion batteries connected by ultramicro particles and preparation method thereof
  • Spherical anode materials for lithium ion batteries connected by ultramicro particles and preparation method thereof
  • Spherical anode materials for lithium ion batteries connected by ultramicro particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 0.05mol of FeC according to the stoichiometric ratio Li:Fe:P=1:1:1 2 o 4 2H 2 O, NH 4 h 2 PO 4 , LiOH·H2 O, put into the ball mill jar, according to each mole of LiFePO 4 Add 200ml of solvent, add ethanol, and ball mill for 10 hours;

[0033] 2) The ball-milled material is pre-burned for 3 hours at a temperature of 300°C by introducing argon gas;

[0034] 3) According to the calculation that the carbon mass of sucrose after carbonization is 3% of the theoretical output of lithium iron phosphate, the sucrose is weighed and added to the pre-burned powder, and the amount is calculated according to each mole of LiFePO 4 Add 500ml of solvent, add ethanol, and ball mill for 10 hours;

[0035] 4) According to each mole of LiFePO 4 Add 1000ml of solvent, add ethanol to the ball-milled material to form a suspension;

[0036] 5) The prepared suspension is spray-dried;

[0037] 6) Put the dried powder into a sintering furnace, pass in argon gas, and sinter at a ...

Embodiment 2

[0040] 1) Weigh 0.05mol of FePO according to the stoichiometric ratio Li:Fe:P=1:1:1 4 4H 2 O and 0.025 mol of Li 2 CO 3 , put into the ball mill jar, according to each mole of LiFePO 4 Add 300ml of solvent, add ethanol, and ball mill for 10 hours;

[0041] 2) The ball-milled material is fed with argon and hydrogen (the volume ratio of argon and hydrogen is argon:hydrogen=90:10) at a temperature of 300° C., and pre-burned for 3 hours;

[0042] 3) According to the calculation that the carbon mass of sucrose after carbonization is 3% of the theoretical output of lithium iron phosphate, the sucrose is weighed and added to the pre-burned powder, and the amount is calculated according to each mole of LiFePO 4 Add 500ml of solvent, add ethanol, and ball mill for 10 hours;

[0043] 4) According to each mole of LiFePO 4 Add 2000ml of solvent, add ethanol to the ball-milled material to form a suspension;

[0044] 5) The prepared suspension is spray-dried;

[0045] 6) Put the dri...

Embodiment 3

[0048] 1) Weigh 0.03mol of V according to the chemical mass ratio Li:V:P=3:2:3 2 o 5 , 0.09mol of NH 4 h 2 PO 4 and LiOH·H 2 O, put into the ball mill jar, according to each mole of Li 3 V 2 (PO 4 ) 3 Add 450ml of solvent, add ethanol, and ball mill for 10 hours;

[0049] 2) The ball-milled material is fed with argon and hydrogen (the volume ratio of argon and hydrogen is argon:hydrogen=90:10) at a temperature of 300° C., and pre-burned for 3 hours;

[0050] 3) According to the calculation that the carbon mass of sucrose after carbonization is 3% of the theoretical lithium vanadium phosphate mass, the sucrose is weighed and added to the pre-calcined powder, at the rate of 3 V 2 (PO 4 ) 3 Add 1000ml of solvent, add ethanol, and ball mill for 10 hours;

[0051] 4) According to each mole of Li 3 V 2 (PO 4 ) 3 Add 3000ml of solvent, add ethanol to the ball-milled material to form a suspension;

[0052] 5) The prepared suspension is spray-dried;

[0053] 6) Put t...

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Abstract

The invention provides spherical anode materials for lithium ion batteries connected by ultramicro particles and a preparation method thereof. The anode material is LiFePO4 / C or Li3V2 (PO4)3 / C. The anode materials of the invention have the advantages of ultrafine particles and spherical materials, the ultramicro particles lead the materials to have shorter lithium ion diffusion distance, and connection between ultramicro particles increases the effective contact specific surface area of the materials so as to improve conductivity; micron-grade regular spherical particles can prevent the irregular agglomeration of the ultramicro particles and are favourable for evenly dispersing anode sizes, and excellent mobility is favourable for coating pole pieces. In the method of the invention, by means of wet milling before presintering the materials, raw materials can be fully mixed and the defect that raw materials in a solid state method can not fully contact can be overcome; presintered materials and a carbon resource are subject to wet milling and again and then are dried by a spray method so as to obtain the spherical materials connected by the ultramicro particles, the spherical materials have even particle diameter distribution, controllable size and regular topography.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a spherical positive electrode material for lithium ion batteries connected by ultramicrosphere particles and a preparation method thereof. Background technique [0002] In the context of energy crisis, energy conservation and environmental protection issues are becoming more and more prominent, lithium-ion batteries that were commercialized in the early 1990s have the advantages of light weight, high working voltage, no pollution, long life, small self-discharge coefficient, wide temperature range, etc. It has become the most promising power battery for electric vehicles, but there are many problems in the marketization process of the power battery. For cathode materials, the following key issues need to be resolved. 1. High safety performance: no fire or explosion under overcharge, overdischarge, etc.; 2. High-rate ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/133H01M4/1397H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 黄兵
Owner 黄兵