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Negative electrode active material and negative electrode for lithium ion secondary battery

A negative electrode active material, secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of short cycle life, low compaction density, low gram capacity of negative electrode active materials, etc., to improve electrical conductivity, The effect of reducing contact resistance and shortening the transmission path

Active Publication Date: 2011-12-21
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide negative electrode active material and negative electrode for lithium ion secondary battery, solve the prior art such as low gram capacity, low compaction density and short cycle life of existing lithium ion secondary battery negative electrode active material In order to solve the problems existing in the lithium-ion secondary battery, there is provided a negative electrode active material with high gram specific capacity, high compacted density and excellent cycle performance, which also has excellent rate performance and low temperature performance, and a preparation method thereof, and the use of the negative electrode The negative electrode of the active material can reduce the cost of the negative electrode active material of the lithium-ion secondary battery while improving the overall performance of the lithium-ion secondary battery

Method used

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  • Negative electrode active material and negative electrode for lithium ion secondary battery
  • Negative electrode active material and negative electrode for lithium ion secondary battery
  • Negative electrode active material and negative electrode for lithium ion secondary battery

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preparation example Construction

[0028] The preparation method of the negative electrode active material for lithium ion secondary battery of the present invention includes the following steps:

[0029] 1. The mass ratio of spherical graphite and total artificial graphite is 5:95~95:5 (the ratio of massive artificial graphite and needle-shaped artificial graphite is 5:95~95:5), and the mass ratio of the mixed matrix 1-20% pitch or resin, put the total weight of spherical graphite, block artificial graphite, needle-shaped artificial graphite, pitch or resin and solvent in the mixer at a ratio of 1-10 liters / Kg, at 500-2000r Mix for 30~240min at a rotation speed of / min to obtain a mixed emulsion;

[0030] 2. Fuse the mixed emulsion in a fusion machine at a speed of 300 ~ 3000r / min and a fusion temperature of 20 ~ 100 ℃ for 30 ~ 240 min to obtain a fusion precursor;

[0031] The solvent is one or a mixed solvent of water, ethanol, isopropanol, glycerol, acetone, toluene, or xylene.

[0032] 3. Under the protection of ...

Embodiment 1

[0048] Such as figure 1 , 2 , 3 shows, in the mixer, the mass ratio of spherical graphite is 3:2: the total amount of artificial graphite (the ratio of massive artificial graphite to needle-shaped artificial graphite in artificial graphite is 3:2), and the graphite mass is 5% Mix the asphalt with 10L / kg of total solid mass of water, and mix for 120min at a speed of 1000r / min to obtain a mixed emulsion; put the mixed emulsion in a fusion machine at a speed of 2500r / min and a fusion temperature of 60℃ Fusion precursor is obtained by fusion for 30 minutes under argon protective gas; the fusion precursor is placed in a high-temperature furnace at 10°C / min to 800°C for 16 hours, and then cooled to 5°C / min at a cooling rate Room temperature; graphitization heat treatment is performed at 3000° C. to obtain a negative electrode active material for a lithium ion secondary battery.

Embodiment 2

[0050] In the mixer, the spherical graphite with a mass ratio of 5:3: the total amount of artificial graphite (the ratio of massive artificial graphite to needle-shaped artificial graphite in artificial graphite is 1:1), graphite mass 10% pitch and 8L / The total mass of kilograms of solid acetone is mixed and mixed for 60 minutes at a rotation speed of 1200r / min to obtain a mixed emulsion; the mixed emulsion is fused in a fusion machine at a rotation speed of 2000r / min and a fusion temperature of 80°C for 15 minutes. The fusion precursor is obtained; the fusion precursor is placed in a high temperature furnace at 8°C / min to 600°C for 24 hours, and then cooled to room temperature at a cooling rate of 3°C / min; then at 2900°C After performing graphitization heat treatment, an anode active material for a lithium ion secondary battery is obtained.

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Abstract

The invention discloses a cathode active substance and cathode used for a lithiumion secondary battery. In the cathode active substance used for the lithiumion secondary battery, a mixture of spherical or torispherical graphite, massive artificial graphite the particle length-width ratio of which is 1.0-3.0 and needle-like artificial graphite the particle length-width ratio of which is 1.0-4.0 is taken as a substrate; non-graphite carbon materials are cladded outside the mixed substrate; the cladding amount is 1-20% of the mass of the mixed substrate; the non-graphite carbon material is asphalt or resin; the gram specific capacity of the cathode active substance is 350-370mAh / g, the particle size is 4.0-45mu m, the specific surface area is 1.0-4.0m<2> / g, the compacted density of the powder body is 1.65-2.10g / cm<3>, and the layer space (d002) is 0.3354-0.3370nm. The cathode active substance provided by the invention has the beneficial effects of improving the conductivity performance of materials, ensuring the excellent multiplying power and circular stability of materials, and satisfying different high-end requirements, especially the requirements of electric automobiles (EV), hybrid electric vehicles (HEV) and batteries in the energy storage field.

Description

Technical field [0001] The invention relates to a negative electrode active material and a negative electrode, in particular to a negative electrode active material and a negative electrode for lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries, as high-capacity, high-voltage, small and lightweight rechargeable secondary batteries, are widely used in mobile electronic devices such as mobile phones, notebook computers, tablet computers, and cameras. Due to the requirements for further miniaturization and high cruising capability of mobile electronic equipment, lithium ion secondary batteries are required to be smaller and lighter, with higher energy density and excellent cycle performance. On the other hand, considering environmental issues, the development of electric vehicles (EV) and hybrid electric vehicles (HEV) to replace the original fuel vehicles, and lithium-ion energy storage batteries to replace the original lead-acid batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 刘小虹黄雨生罗建伟吴壮雄
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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