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Cathode material for lithium-ion power battery and preparation method thereof

A technology for negative electrode materials and power batteries, which is applied in the field of lithium ion power battery negative electrode materials and its preparation, can solve the problems of complex process, low rate performance, and small lithium ion diffusion coefficient, and achieve simple preparation methods, excellent rate performance, Superior liquid absorption performance

Inactive Publication Date: 2011-08-10
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 diffusion coefficient of lithium ions between graphite layers is small, which seriously restricts the improvement of the high-rate charge-discharge performance of lithium-ion batteries.
In addition, the process of most anode materials for power batteries is complicated, and the cost rises accordingly. The anode materials of lithium-ion power batteries in the prior art have low rate performance, low specific capacity, low temperature performance and liquid absorption performance, which affect the performance of lithium-ion power batteries. further improvement of

Method used

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Examples

Experimental program
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Effect test

example 1

[0024] Example 1, using graphitized needle coke as a raw material, after crushing and shaping, its particle size D50=9μm, and its specific surface area is 7.5m 2 / g, then mixed with asphalt, the mass of asphalt is 8% of needle coke, stirred by V-type mixer for 1h, and then sent to tunnel kiln for carbonization treatment, the protective gas is nitrogen, the carbonization temperature is 1200°C, and the carbonization time After 18 hours, cool down to room temperature with the furnace, sieve and pack.

example 2

[0025] Example 2, using graphitized needle coke as a raw material, after crushing and shaping, its particle size D50=11μm, and its specific surface area is 5.5m 2 / g, then mixed with asphalt, the mass of asphalt is 5% of needle coke, stirred by V-type mixer for 1h, and then sent to the tunnel kiln for carbonization treatment, the protective gas is nitrogen, the carbonization temperature is 1200°C, and the carbonization time After 18 hours, cool down to room temperature with the furnace, sieve and pack.

example 3

[0026] Example 3, using crucible material as raw material, after crushing and shaping, its particle size D50=9μm, specific surface area is 7.5m 2 / g, then mixed with asphalt, the mass of asphalt is 8% of needle coke, stirred by V-type mixer for 1h, and then sent to tunnel kiln for carbonization treatment, the protective gas is nitrogen, the carbonization temperature is 1200°C, and the carbonization time After 18 hours, cool down to room temperature with the furnace, sieve and pack.

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Abstract

The invention discloses a cathode material for a lithium-ion power battery and a preparation method thereof. A graphite matrix used by the cathode material is spherical-like artificial graphite which has a spherical shape and has a length-width ratio of 1.0-3.0; the granularity D50 before the matrix material is coated is 9 to 11 mu m; a layer of ungraphitised carbon material is coated on the surface of the matrix to form a nucleus-shell structure; the coating amount is 2 to 8 percent of the mass of the matrix; the granularity D50 of the coated cathode material granules is 10 to 12 mu m; the specific surface area is 2 to 4m<2> / g; the tap density of powder is 0.9 to 1.1g / cm<3>; and the carbon content is over 99.95 percent. The invention has the advantages that: the cathode material for the lithium-ion power battery has the characteristics of high capacity, excellent rate performance and excellent liquid absorption property, and the preparation method is simple, easy to control, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a negative electrode material and a preparation method thereof, in particular to a negative electrode material for a lithium-ion power battery 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 field of power supplies. The use of graphite materials as anode materials for lithium-ion batteries has the advantages of good intercalation and delithiation reversibility, low potential platform, and excellent cycle performance. Its theoretical specific capacity is as high as 372 mAh / g, which is much higher than that of positive electrode materials such as LiCoO2. However, the diffusion coefficient of lithium ions between graphite layers is small, which seriously restricts the improvement of high-rate charge-discharge performance of lithium-ion batteries. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 黄雨生吴壮雄罗建伟
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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