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Lithium titanate negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of lithium titanate negative electrode material process complexity, poor cycle performance and rate charge and discharge performance, and achieve the first charge and discharge efficiency Improvement, electrical conductivity and mechanical properties, simple process

Inactive Publication Date: 2015-06-24
SHENZHEN XIANGFENGHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a lithium titanate negative electrode material and a preparation method thereof, which can effectively solve the problem of the existing lithium titanate negative electrode material with complex processes and cycle problems. Performance and rate Charge and discharge performance is not good and other issues

Method used

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  • Lithium titanate negative electrode material and preparation method thereof
  • Lithium titanate negative electrode material and preparation method thereof

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preparation example Construction

[0024] The preparation method of lithium titanate negative electrode material is made by the following specific steps:

[0025] (1) Dispersion: disperse graphite, gallium powder, cesium powder, lithium cobaltate, cerium oxide and ammonium persulfate in a solvent, and ultrasonically 0.5-2 hours to obtain a mixed slurry;

[0026] (2) Grinding: Grind the mixed slurry with a sand mill for 1-5 hours at a grinding speed of 500-2500 r / min, then add solvent to adjust the solid mass content of the mixed slurry to 5-40%;

[0027] (3) Coating: add the ground mixed slurry and lithium titanate into a high-speed mixer, the stirring speed is 500-2000 r / min, and the stirring time is 2-3 hours;

[0028] (4) Drying: The material obtained in step (3) is dried into powder using a spray dryer. The air inlet temperature of the spray drying is 150-300 ℃, the air outlet temperature is 100-150 ℃, and the rotation speed of the constant flow pump is 50-100 r / min;

[0029] (5) Mixing: Mix the material...

Embodiment 1

[0033] The lithium titanate negative electrode material is made of the following raw materials in parts by weight: lithium titanate 350, graphite 40, gallium powder 4, cesium powder 3, lithium cobaltate 4.3, cerium oxide 2, ammonium persulfate 1, modified silver powder 6;

[0034] Described modified silver powder is made from the raw material of following parts by weight: silver powder 80, nano-carbon 3, tapioca starch 3.5, bauxite 3.5, diatomite 3.2, methyltriethoxysilane 2.4, silicon carbide 3.4; The raw materials are mixed evenly, heated to 60°C, ground for 2 hours, dispersed evenly into powder, sent to a calciner for sintering at 540°C for 1 hour.

[0035] The preparation method of lithium titanate negative electrode material is made by the following specific steps:

[0036] (1) Dispersion: disperse graphite, gallium powder, cesium powder, lithium cobaltate, cerium oxide and ammonium persulfate in a solvent, the solvent is water, and ultrasonically 0.5h to obtain a mixed s...

Embodiment 2

[0043] The lithium titanate negative electrode material is made of the following raw materials in parts by weight: lithium titanate 380, graphite 50, gallium powder 5, cesium powder 4, lithium cobaltate 5, cerium oxide 3, ammonium persulfate 2, modified silver powder 10;

[0044] Described modified silver powder is made from the raw material of following weight portion: silver powder 90, nano-carbon 4, tapioca starch 4, bauxite 4, diatomite 3.9, methyltriethoxysilane 3.2, silicon carbide 4.2; The raw materials are mixed evenly, heated to 65°C, ground for 3 hours, dispersed evenly into powder, sent to a calciner for sintering at 560°C for 2 hours.

[0045] The preparation method of lithium titanate negative electrode material is made by the following specific steps:

[0046] (1) Dispersion: Disperse graphite, gallium powder, cesium powder, lithium cobaltate, cerium oxide and ammonium persulfate in a solvent, the solvent is water, and ultrasonically for 2 hours to obtain a mixed s...

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Abstract

The invention discloses a lithium titanate negative electrode material and a preparation method thereof. The lithium titanate negative electrode material is prepared from the following raw materials in parts by weight: 350-380 parts of lithium titanate, 40-50 parts of graphite, 4-5 parts of gallium powder, 3-4 parts of cesium powder, 4.3-5 parts of lithium cobaltate, 2-3 parts of cerium oxide, 1-2 parts of ammonium persulfate and 6-10 parts of modified silver powder. The lithium titanate negative electrode material is prepared by sequentially carrying out procedures of dispersing, grinding, covering, drying, mixing and carrying out microwave heating. According to the formula and the preparation method, disclosed by the invention, the conductive performance and the mechanical performance of the prepared negative electrode material are greatly improved; the conductive performance and the mechanical performance are improved so that the circulating performance, the multiplying power charging / discharging performance and the first-time charging / discharging performance are improved when the negative electrode material is used as a lithium ion battery negative electrode material; and the preparation method adopts a simple process, and a simple and efficient microwave chemical method is used, so that the power consumption is greatly reduced.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a lithium titanate negative electrode material and a preparation method thereof. Background technique [0002] Since lithium-ion secondary batteries entered commercial applications in the 1990s, negative electrode materials have successively experienced the use of soft / hard carbon, graphite, lithium titanate, and silicon carbon. At present, the lithium titanate negative electrode material has been mass-produced, but its compaction density is only 2.0g / cm3, the discharge platform is high (1.5V), the specific capacity is low (about 160mAh / g), and its own conductivity is not good (conductivity :10-9S / cm), so the application in the 3C field is of little significance. Silicon carbon materials are still in the early stage of promotion. [0003] From the perspective of comprehensive performance, because natural and artificial graphite have great advantages...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62
CPCY02E60/10
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD