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Nanometer lithium titanium phosphate and carbon nanotube composite material and preparation method thereof

A nano-titanium phosphate and carbon nanotube technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of difficult control of product particle size, poor electrochemical performance of materials, and low electronic conductivity, etc. Good product reproducibility, improved electrical conductivity, and stable process effects

Pending Publication Date: 2022-04-12
台州闪能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Preparation of LiTi using a traditional high-temperature solid-state method 2 (PO 4 ) 3 , the product has the disadvantages of difficult control of particle size, uneven distribution, irregular shape, etc.
And LiTi 2 (PO 4 ) 3 The electronic conductivity is not high, the polarization of the material during charging and discharging is large, and the electrochemical performance of the material is poor. 2 (PO 4 ) 3 Modification, the current main modification methods are carbon coating, element doping, etc.

Method used

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  • Nanometer lithium titanium phosphate and carbon nanotube composite material and preparation method thereof
  • Nanometer lithium titanium phosphate and carbon nanotube composite material and preparation method thereof
  • Nanometer lithium titanium phosphate and carbon nanotube composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Preparation of nano-titanium phosphate powder: 57.6g of citric acid and 680.6g of tetrabutyl titanate were added to 500mL of absolute ethanol in turn and stirred evenly, 471.6g of ammonium dihydrogen phosphate was dissolved in 800mL of deionized water, and the temperature was kept at 50°C Under stirring, the above-mentioned ammonium dihydrogen phosphate solution was quickly added to the tetrabutyl titanate solution, and the pH was controlled at 4. After reacting for 24 hours, it was allowed to stand and age to obtain a titanium phosphate wet gel, which was then dried by pressing and crushed to obtain nano-titanium phosphate powder. body;

[0034] (2) Preparation of nanolithium titanium phosphate@carbon nanotube precursor: 20.0g PVP was dissolved in 976mL deionized water, 3.6g multi-walled carbon nanotubes were added, shear emulsified to disperse into a uniform carbon nanotube conductive paste. Then add 359.8g of nano-titanium phosphate and 14.8g of lithium carbonate...

Embodiment 2

[0037] The difference between Example 2 and Example 1 is that the mass of tetrabutyl titanate is 680.6 g, and the mass of ammonium dihydrogen phosphate is 437.1 g.

Embodiment 3

[0039] The difference between Example 3 and Example 1 is that the mass of tetrabutyl titanate is 680.6g, and the mass of ammonium dihydrogen phosphate is 552.2g;

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a nanometer titanium lithium phosphate and carbon nanotube composite material and a preparation method thereof. The preparation method comprises the following steps: firstly preparing nano titanium phosphate powder by combining a gel-sol method with a nano superfine grinding and dispersing technology and a solid-phase reaction technology, then reacting with a lithium source compound to obtain nano titanium lithium phosphate, and then preparing the cross-linked nano titanium lithium phosphate and carbon nanotube composite material by combining with a carbon nanotube. The stable structure of the titanium lithium phosphate and the conductive network of the carbon nano tube have a synergistic effect, and meanwhile, the cycle performance and the rate capability of the composite material are improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a nano lithium titanium phosphate@carbon nanotube composite material and a preparation method thereof. 【Background technique】 [0002] Graphite carbon material is currently the most widely used negative electrode material in the lithium-ion battery industry. However, because the graphite deintercalation potential is close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon negative electrode, and dendrite lithium will be formed to pierce the separator. And cause a short circuit, when the temperature is too high, it is easy to cause safety problems such as thermal runaway. At the same time, the repeated insertion and deintercalation of lithium ions will damage the structure of the carbon negative electrode, resulting in capacity attenuation and shor...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 焦玉志秦军阮殿波郭呈家张超
Owner 台州闪能科技有限公司