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A preparation method and applications of a lithium battery material with high rate performance

A lithium battery material, high-rate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced electrical conductivity of materials, reduction of high-rate performance of battery negative electrode materials, increase of polarization resistance and mass transfer resistance, etc.

Active Publication Date: 2013-06-19
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention tried to use this process to prepare a lithium titanate material. Its internal microstructure shows that there are more irregular holes in its spherical particles, and the existence of more holes will lead to the material being conductive. The reduction of performance increases the polarization resistance and mass transfer resistance, and reduces the high-rate performance of the material as a battery negative electrode material

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  • A preparation method and applications of a lithium battery material with high rate performance
  • A preparation method and applications of a lithium battery material with high rate performance
  • A preparation method and applications of a lithium battery material with high rate performance

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preparation example Construction

[0030] As mentioned above, the purpose of the present invention is to increase the electrical conductivity, reduce the mass transfer resistance, and enhance the high-rate performance by changing the pore size of the lithium battery material and enhancing the close contact between the small particles inside the spherical particles. For this reason, the present invention provides a kind of lithium battery material preparation method with high rate performance, and described preparation method comprises the following steps:

[0031] The first step is to provide the titanium precursor titanium dioxide;

[0032] In the second step, the titanium precursor titanium dioxide, pore-forming agent and water are uniformly mixed to form a water slurry with a solid content of 10-40% by weight, preferably 15-35% by weight, most preferably 20-30% by weight, and the The ratio of the pore-forming agent in the total solid content is 10-50% by weight, preferably 15-40% by weight, most preferably 1...

Embodiment 1

[0056] (1) According to the solid content of 30% in the water slurry before spray drying, weigh 54g of titanium dioxide powder (Shanghai Pengbo Titanium Dioxide Co., Ltd., model PG995), 6g of soluble starch, add 200ml of deionized water, 300rpm / min magnetic force Stir for 24 hours, mix well;

[0057] (2) On a spray dryer (Shanghai Yacheng Instrument Equipment Co., Ltd., model YC-015), pump the mixed slurry into the spray chamber at a speed of 50rpm / min, and spray dry it at 200°C under a pressure of 3MPa into spherical particles, cooling;

[0058] (3) After spray-drying powder, in nitrogen (N 2 ) in an atmosphere furnace under the protection of 500°C for 3 hours, and then placed in a muffle furnace for 3 hours at 500°C to obtain spherical mesoporous titanium dioxide powder;

[0059] (4) Weigh 18.6g of the corresponding mesoporous titanium dioxide powder, 6.9g of lithium carbonate, and 4.0g of soluble starch, add them to 100ml of deionized water, and stir magnetically at 300rp...

Embodiment 2

[0077] (1) According to the solid content of 30% in the water slurry before spray drying, weigh 45g of titanium dioxide powder (Shanghai Pengbo Titanium Dioxide Co., Ltd., model PG995), 45g of soluble starch, add 300ml of deionized water, 300rpm / min magnetic force Stir for 24 hours, mix well;

[0078] (2) On a spray dryer (Shanghai Yacheng Instrument Equipment Co., Ltd., model YC-015), pump the mixed slurry into the spray chamber at a speed of 50rpm / min, and spray dry it at 200°C under a pressure of 3MPa into spherical particles, cooling;

[0079] (3) After spray drying, the powder is placed in a muffle furnace and heat-treated at 600°C for 3 hours to obtain spherical mesoporous titanium dioxide powder;

[0080] (4) Weigh 18.6g of the corresponding mesoporous titanium dioxide powder, 6.9g of lithium carbonate, and 4.0g of soluble starch into 100ml of deionized water, and stir magnetically at 300rpm / min at room temperature for 24h to mix;

[0081] (5) Put the mixed slurry in ...

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Abstract

The invention provides a preparation method and applications of a lithium battery material with high rate performance. The method comprises the steps of: providing titania as a titanium precursor; mixing uniformly the titania as the titanium precursor, an pore-forming agent and water to form an aqueous slurry with a solid content of 10-40 wt%, wherein the pore-forming agent accounts for 10-50 wt% of all solid content, and then spray-drying the obtained mixture to form spherical particles; performing heat treatment to obtain spherical mesoporous titania powder; and in accordance with the atomic ratio of lithium and titanium in lithium titanate, a ratio of a lithium precursor with an excess amount of 1-8 wt%, and theoretical carbon content of 0-5 wt%, weighing the obtained titania powder, the lithium precursor, a carbon precursor and a proper amount of water, stirring and performing heat treatment to the uniformly stirred aqueous slurry in a protective atmosphere or in the air. According to the preparation method of the present invention, the close contact between small particles inside the spherical particles is enhanced, thereby increasing the conductivity, reducing the mass transfer resistance, and improving the high-rate performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery negative electrode material, in particular to a preparation method of a lithium titanate battery negative electrode material with high rate performance. Background technique [0002] Compared with commercial lithium-ion battery anode carbon materials, the spinel-structured lithium titanate Li 4 Ti 5 o 12 It has a cubic structure and "zero strain" performance, and has good dynamic performance and stability; it has low activity in reacting with the electrolyte, and it is not easy to form an impedance layer; it has a high specific surface area and has fast charging kinetic characteristics; no SEI film formation , has the advantages of good thermal stability and safety characteristics. But the material itself has a low electrical conductivity (approximately 10 -9 S / cm), which can significantly increase the internal resistance and mass transfer resistance of the battery during the charge...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/10
Inventor 马丽荣汪国庆马春印赵培王迎姿
Owner ENN SCI & TECH DEV
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