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Sodium-titanium phosphate/carbon composite material and preparation method and use thereof

A carbon composite material, sodium titanium phosphate technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems affecting sodium ion batteries, low capacity of sodium titanium phosphate, uneven carbon coating, etc. The layer is uniform and dense, the gram capacity is improved, and the uniformity is good.

Inactive Publication Date: 2017-05-31
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Sodium titanium phosphate is an important electrode material for sodium ion batteries, and its performance greatly affects the performance of sodium ion batteries. Therefore, it is imperative to study sodium titanium phosphate materials with excellent performance. At present, titanium phosphate prepared by traditional methods Sodium generally has the problems of low electrical conductivity and uneven carbon coating, which leads to generally low capacity and poor cycle performance of sodium titanium phosphate

Method used

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  • Sodium-titanium phosphate/carbon composite material and preparation method and use thereof
  • Sodium-titanium phosphate/carbon composite material and preparation method and use thereof
  • Sodium-titanium phosphate/carbon composite material and preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Preparation of sodium titanium phosphate / carbon composite:

[0061] Mix sodium carbonate, titanium dioxide, and ammonium dihydrogen phosphate to obtain a precursor, make the molar ratio of Na:Ti:P in the precursor 1:2:3, add citric acid according to 10% of the total mass of the precursor, and then press the Add ethanol to 50% of the total mass of the body for ball milling, take out the slurry once after 5 hours, and dry it with a closed spray. Under the atmosphere, the temperature was raised to 300°C at 2°C / min, and the temperature was kept at 300°C for 6 hours to achieve primary carbon coating and obtain a primary carbon-coated product. Add super-p according to 1% of the total mass of the primary carbon-coated product, and then Add ethanol to 50% of the total mass of the primary carbon-coated product for ball milling, take out the secondary slurry after 5 hours, and dry it with a closed spray, set the air inlet temperature to 220°C, and the air outlet temperature to 75...

Embodiment 2

[0073] Mix sodium dihydrogen phosphate, titanium dioxide, ammonium phosphate, and magnesium acetate to obtain a precursor, so that the molar ratio of Na:Ti:P:Mg in the precursor is 1.03:1.9:3.15:0.05, according to 20% of the total mass of the precursor Add polyvinyl alcohol, then add water according to 30% of the total mass of the precursor for ball milling, take out the slurry once after 3 hours, and dry it with a closed spray, set the air inlet temperature to 250°C, and the air outlet temperature to 90°C, and then the obtained Material in N 2 Under the atmosphere, the temperature was raised to 500°C at 10°C / min, and the temperature was kept at 500°C for 10h to obtain a primary carbon-coated product. Glucose was added according to 10% of the total mass of the primary carbon-coated product, and then according to the primary carbon-coated product Add water to 30% of the total mass for ball milling, take out the secondary slurry after 5 hours, and dry it with a closed spray. 2 ...

Embodiment 3

[0078] Mix disodium hydrogen phosphate, titanium hydroxide, ammonium dihydrogen phosphate, and niobium pentoxide to obtain a precursor, so that the molar ratio of Na:Ti:P:Nb in the precursor is 0.95:2.05:3:0.01, according to the precursor Add sucrose to 12% of the total mass of the precursor, then add acetone to 50% of the total mass of the precursor for ball milling, take out the slurry once after 5 hours, and dry it with a closed spray, set the air inlet temperature to 220°C, and the air outlet temperature to 75°C , and then spray-dry the material obtained in N 2The temperature was raised to 600°C at 20°C / min under the atmosphere, and the temperature was kept at 600°C for 15 hours to achieve primary carbon coating and obtain a primary carbon-coated product. Add cyclodextrin according to 5% of the total mass of the primary carbon-coated product, Then add water according to 30% of the total mass of the primary carbon-coated product for ball milling, take out the secondary slur...

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Abstract

The invention belongs to the field of electrode material synthesis, and relates to a sodium-titanium phosphate / carbon composite material and a preparation method and use thereof. The sodium-titanium phosphate / carbon composite material comprises secondary particles formed by clustering primary particles, the primary particles comprise sodium-titanium phosphate particles and carbon layers coated on the surfaces of the sodium-titanium phosphate particles, and the carbon layers are prepared through two times of carbon coating. According to the sodium-titanium phosphate / carbon composite material and the preparation method and use thereof, by means of preparing a precursor of the sodium-titanium phosphate and then adopting a spray drying method to carry out primary carbon coating and secondary carbon coating, the sodium-titanium phosphate / carbon composite material having a uniform and compact coating carbon layer is prepared, and the problem that the coating carbon layer obtained by the primary carbon coating is not uniform is solved. The composite material is good in stability, electrodes prepared from the sodium-titanium phosphate / carbon composite material and assembled batteries have excellent electrochemical properties, the discharge capacity is above 115mAh / g, and the capacity retention ratio is above 95% after 500 weeks of circulation.

Description

technical field [0001] The invention belongs to the field of electrode material synthesis, and relates to a sodium titanium phosphate / carbon composite material, its preparation method and application, in particular to a titanium sodium phosphate / carbon composite material, its preparation method and its application for sodium ion batteries. Background technique [0002] In recent years, in the face of the energy crisis, financial crisis, and human beings' understanding of the climate crisis, maintaining ecological balance and protecting the environment are fundamental issues related to human survival and social development. [0003] With the development of social economy, the problem of energy crisis is more and more perplexing people's living environment. Many countries have put forward the countermeasures to solve the problem from different angles. As the carrier of urban public space communication, public facilities play a role in people's lives. Many renewable energy reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/587H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 席小兵张怀文庞钧友黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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