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Torispherical cathode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the rate performance of graphite materials that are not involved, and achieve the effects of improving high rate performance, improving the first Coulomb efficiency, and shortening the diffusion path.

Active Publication Date: 2010-12-15
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two patents are limited to low-rate lithium-ion battery anode materials, and do not involve improvements in improving the rate performance of graphite materials

Method used

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  • Torispherical cathode material for lithium ion battery and preparation method thereof
  • Torispherical cathode material for lithium ion battery and preparation method thereof
  • Torispherical cathode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Crush 50kg of spherical artificial graphite through a pulverizer, and the pulverized artificial graphite D50: 17-20um.

[0018] 2. Add the pulverized and shaped artificial graphite to pitch coke and pore former. The proportion of artificial graphite, silicon powder and pitch coke is 100:5:10. Stir uniformly at 210°C, and the mixing time is 2h.

[0019] 3. Then the uniformly stirred materials are carbonized under nitrogen protection at 900°C for 5h.

[0020] 4. The carbonized material is sent to a high temperature furnace at 2600°C and graphitized under the protection of nitrogen.

[0021] 5. Production and testing of button batteries

[0022] 1) Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0023] 2), Binder: LA-133: 3%

[0024] 3) Conductive agent: Super-P: 3%

[0025] 4) Counter electrode: pure lithium sheet

[0026] 5), charge and discharge system

[0027] (A) Constant current discharge (0.2mA, 0.001V)

[0028] (B) Let stand (1min)

[0029] (C) Constant current charging (0.2mA, 2.000V)

[003...

Embodiment 2

[0032] 1. The 50kg spherical natural graphite: spherical artificial graphite weight ratio 1:1 mixed raw materials are crushed by a crusher, and the crushed artificial graphite D50: 17-20um.

[0033] 2. Add the pulverized and shaped mixed raw materials into pitch coke and pore-forming agent. The proportion of artificial graphite, silicon powder and pitch coke is 100:2:15. Stir uniformly at 260°C, and the mixing time is 2 hours.

[0034] 3. Then the uniformly stirred materials are carbonized under nitrogen protection at 900°C for 6 hours.

[0035] 4. The carbonized material is sent to a high temperature furnace at 2600°C and graphitized under the protection of nitrogen.

[0036] 5. Production and testing of button batteries

[0037] 1) Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0038] 2), Binder: LA-133: 3%

[0039] 3) Conductive agent: Super-P: 3%

[0040] 4) Counter electrode: pure lithium sheet

[0041] 5), charge and discharge system

[0042] (A) Constant current discharge (0.2mA, 0.001V)

[0043] ...

Embodiment 3

[0047] 1. The 50kg mesocarbon microspheres are crushed by a pulverizer, and the pulverized artificial graphite D50: 17-20um.

[0048] 2. Add the pulverized and shaped mesocarbon microspheres into pitch coke and pore-forming agent. The proportion of artificial graphite, silicon powder and pitch coke is 100:5:10. Stir uniformly at 230°C and the mixing time is 2h.

[0049] 3. Then the uniformly stirred materials are carbonized under nitrogen protection at 900°C for 5 hours.

[0050] 4. The carbonized material is sent to a high temperature furnace at 2600°C and graphitized under the protection of nitrogen.

[0051] 5. Production and testing of button batteries

[0052] 1) Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0053] 2), Binder: LA-133: 3%

[0054] 3) Conductive agent: Super-P: 3%

[0055] 4) Counter electrode: pure lithium sheet

[0056] 5), charge and discharge system

[0057] (A) Constant current discharge (0.2mA, 0.001V)

[0058] (B) Let stand (1min)

[0059] (C) Constant current charging (0.2mA, ...

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Abstract

The invention discloses a torispherical cathode material for a lithium ion battery, which has a 'shell-core' graphite composite microstructure, wherein an inner core may be spherical natural graphite, spherical artificial graphite, a mesocarbon microbead or a mixture of the three; a shell is a graphitized product of asphalt; an interlayer distance between the inner core and the shell ranges from 0.3360 to 0.3390nm; and the torispherical cathode material has a mesoporous structure with an aperture of 10 to 50nm, and the ratio of granular length to granular width of the graphite composite ranges from 1.0 to 2.0. The torispherical cathode material for the lithium ion battery has the advantages that: 1, the high-rate performance of the electrode material is improved; and the discharge capacitance of the electrode material still reaches 320 to 340mAh / g after 300 times of circulation at a 5C rate; 2, preparation cost is low and atmosphere pollution is avoided; and 3, the shape of the graphite raw material used by the invention is torispherical and favorable for the cladding uniformity of the asphalt and can better strengthen the structural stability of the composite.

Description

Technical field [0001] The invention relates to a negative electrode material for lithium ion batteries and a preparation method thereof, in particular to a quasi-spherical negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the current urgent demand for electric vehicles, power batteries and high-rate electrode materials have become research and development hotspots in the power supply field. Graphite materials as anode materials for lithium-ion batteries have the advantages of good reversibility of lithium insertion and removal, low potential platform and excellent cycle performance. Its theoretical specific capacity is as high as 372mAh / g, which is much higher than that of LiCoO2 and other cathode materials. However, the diffusion coefficient of lithium ions between graphite layers is small, which severely restricts the improvement of the high-rate charge-discharge performance of lithium-ion batteries. In ...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 吴壮雄何月德罗建伟
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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