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Preparing process for positive electrode active material/carbon composite material of Li-ion battery

A cathode active material, lithium ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problem that the cathode material cannot take into account the specific capacity and rate discharge performance at the same time

Active Publication Date: 2007-07-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings that the positive electrode materials prepared in the prior art cannot take into account the specific capacity and rate discharge performance at the same time, and provide a lithium-ion battery positive electrode active material / carbon composite with high specific capacity and good rate discharge performance at the same time. Material preparation method

Method used

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  • Preparing process for positive electrode active material/carbon composite material of Li-ion battery
  • Preparing process for positive electrode active material/carbon composite material of Li-ion battery
  • Preparing process for positive electrode active material/carbon composite material of Li-ion battery

Examples

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Embodiment 1

[0036] This example is used to illustrate the preparation method of the positive electrode active material / carbon composite material for a lithium ion battery provided by the present invention.

[0037] Dissolve 19 g of phenolic resin in acetone, and then mix with 100 g of LiCoO 2 (Particle diameter is 5.2-14.6 microns) mixed and ball milled for 2 hours, the obtained mixture was removed from the solvent, and then sintered at 800°C for 6 hours under the protection of nitrogen to obtain LiCoO 2 / carbon composite. Figure 1 is the LiCoO 2 / XRD spectrum of the carbon composite material, the peak at 2θ=26.14 in the figure is the characteristic peak of carbon, which shows that the prepared product is LiCoO 2 and carbon, and the peaks of 2θ=18.96 and 2θ=45.28 indicate that carbon does not enter the lattice, but is coated in LiCoO 2 s surface. LiCoO 2 The coating amount of surface carbon is LiCoO 2 1% by weight of the positive electrode active material.

Embodiment 2

[0039] This example is used to illustrate the preparation method of the positive electrode active material / carbon composite material for a lithium ion battery provided by the present invention.

[0040] Dissolve 11 g of polyacrylamide in alcohol, then mix with 100 g of LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 (Particle diameter is 5.6-13.8 microns) mixed and ball milled for 2 hours, the obtained mixture is removed from the solvent, and then sintered at 800°C for 2 hours under the protection of nitrogen to obtain LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 / carbon composite. Figure 3 is the LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The XRD pattern of / carbon composite material, the peak at 2θ=26.14 places in the figure is the characteristic peak of carbon, and this shows that the product prepared is LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 and carbon, and the peaks of 2θ=18.68 and 2θ=44.46 indicate that carbon did not enter LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 lattice, but coated in LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 surface. The...

Embodiment 3

[0042] This example is used to illustrate the preparation method of the positive electrode active material / carbon composite material for a lithium ion battery provided by the present invention.

[0043] 21 g of furfural resin was dissolved in methanol, and then mixed with 100 g of LiMn 2 o 4 (Particle diameter is 5.6-14.2 microns) mixed and ball milled for 2 hours, the resulting mixture was removed from the solvent and then sintered at 800°C for 2 hours under the protection of nitrogen to obtain LiMn 2 o 4 / carbon composite. Figure 5 is the LiMn 2 o 4 The XRD pattern of / carbon composite material, the peak at 2θ=26.14 places in the figure is the characteristic peak of carbon, and this shows that the product prepared is LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 and carbon, and the peaks of 2θ=18.78 and 2θ=44.14 indicate that carbon did not enter LiMn 2 o 4 lattice, but coated in LiMn 2 o 4 surface. The coating amount of carbon is LiMn 2 o 4 1% by weight of the positive electr...

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Abstract

A preparing method of lithium-ion battery positive active material / carbon composite material, the method includes: dissolving the carbon coated materials into solvent to getting the carbon coated materials solvent, then mixing and adglutinating the carbon coated materials solvent and the lithium-ion battery positive active material, said carbon coated materials are chosen on or more from sucrose, glucose, starch, lactose, sorbitol, maltose, phenolic resin, furfural resin, urea formaldehyde resin, polyvinyl alcohol, dene PTFE, polyacrylamide, water-soluble epoxide resin, said solvent is chosen one or more of water, acetone, ethanol and carbinol, said agglutination is processed in inert atmosphere. The quality and specific capacity of the lithium-ion battery complex positive material prepared through the method in the invention is higher, the multiplying power battery charging capability is good, it can be used to button, cylindrical and square lithium ion batteries widely.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion secondary battery, in particular to a preparation method of a positive electrode active material / carbon composite material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy, long life, low pollution, light weight, long life, and no memory. At present, about 80% of portable electronic devices such as mobile phones, notebook computers, and cameras use lithium-ion secondary batteries. [0003] Lithium-ion batteries mainly include a battery case, an electrode core and an electrolyte. The electrode core includes a positive electrode, a negative electrode, and a separator separating the positive electrode and the negative electrode. The positive electrode includes a collector and a battery attached to the collector. A positive electrode material, the positive electrode material includes a positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10H01M4/04C08L3/02C08L61/06C08L61/24C08L27/18H01M4/485H01M4/62
CPCY02E60/10
Inventor 冯胜雷
Owner BYD CO LTD
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