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Porous carbon in situ composite lithium iron phosphate cathode material and preparation method thereof

A lithium iron phosphate, in-situ composite technology, applied to battery electrodes, electrical components, circuits, etc., can solve problems such as agglomeration, wide distribution, and large particle size of lithium iron phosphate, and achieve uniform size, simple operation, and low equipment cost Effect

Inactive Publication Date: 2011-09-28
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the problems of large size, wide distribution and serious agglomeration of synthesized lithium iron phosphate particles, the present invention provides a novel porous carbon in-situ composite lithium iron phosphate cathode material and a preparation method thereof

Method used

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  • Porous carbon in situ composite lithium iron phosphate cathode material and preparation method thereof
  • Porous carbon in situ composite lithium iron phosphate cathode material and preparation method thereof
  • Porous carbon in situ composite lithium iron phosphate cathode material and preparation method thereof

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Effect test

Embodiment 1

[0031] (1) Select porous carbon with a carbon pore diameter of 80 nm, weigh 1 g and put it into 1 L of deionized water, stir vigorously for 4 hours, and ultrasonically disperse for 1 hour to finally obtain a suspension of porous carbon.

[0032] (2) Dissolve ferric nitrate and phosphoric acid in deionized water and make a 0.05mol / L solution.

[0033] Mix the ferric nitrate and phosphoric acid solution of the above concentration at a volume ratio of 1:1, and send it into the continuously stirred porous carbon suspension with a peristaltic pump at a feed rate of 2ml / min, and at the same time, send it into a certain concentration of ammonia water with a peristaltic pump To ensure that the pH value of the reaction system during the entire peristaltic titration process is maintained at 2.1, wait until the titration of the mixed solution of iron and phosphorus is completed, then continue to stir for 2 hours, then wash the precipitate with deionized water to neutrality, filter, and dr...

Embodiment 2

[0037] (1) Select porous carbon with a carbon pore diameter of 100 nm, weigh 10 g and put it into 5 L of deionized water, stir vigorously for 4 hours, and ultrasonically disperse for 5 hours to finally obtain a suspension of porous carbon.

[0038] (2) Dissolve ferric chloride and ammonium dihydrogen phosphate with deionized water and make a 0.1mol / L solution.

[0039] Mix the ferric chloride and ammonium dihydrogen phosphate solution of the above concentration at a volume ratio of 1:1, and send it into the continuously stirred porous carbon suspension with a peristaltic pump at a feed rate of 20ml / min. Add a certain concentration of ammonia water to ensure that the pH value of the reaction system during the entire peristaltic titration process is maintained at 2.1. After the titration of the mixed solution of iron and phosphorus is completed, continue to stir for 4 hours, and then wash the precipitate with deionized water to neutrality and filter. Dry at 100°C for 12h.

[00...

Embodiment 3

[0045] (1) Select porous carbon with a carbon pore diameter of 80 nm, weigh 5 g and put it into 3 L of a mixed solution of deionized water and absolute ethanol with a volume ratio of 1:1, stir vigorously for 5 h, and ultrasonically disperse for 2 h to obtain Suspensions of porous carbon.

[0046] (2) Dissolve ferric citrate and ammonium phosphate with deionized water and make a 0.05mol / L solution.

[0047] According to the volume ratio of 1:1.05, the ferric source of the above concentration and the phosphorus source solution are mixed, and the peristaltic pump is used to send it into the continuously stirred porous carbon suspension at a feed rate of 10ml / min. concentration of ammonia water to ensure that the pH value of the reaction system throughout the peristaltic titration process is maintained at 2.05. After the titration of the mixed solution of iron and phosphorus is completed, continue to stir for 5 hours, then wash the precipitate with deionized water until it is neut...

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Abstract

The invention, which belongs to the technical field of lithium ion battery cathode materials, discloses a porous carbon in situ composite lithium iron phosphate cathode material and a preparation method thereof. A synthetic process mainly comprises the following steps: dispersing porous carbon; compositing a precursor FePO4.2H2O / porous carbon, and synthesizing the product of the porous carbon in situ coating lithium iron phosphate cathode material. The porous carbon in situ composite lithium iron phosphate cathode material comprises 0.5 to 15 wt% of the porous carbon, 85 to 99.5 wt% of lithium iron phosphate, and 0 to 10 wt% of residual carbon obtained after organic carbon source pyrolysis. Most lithium iron phosphate particles are restricted in the inner of pores of carbon through in situ coating, so obtained composite cathode material particles have small diameters and a good uniformity. Carbon walls of porous carbon allow uniform coating of the lithium iron phosphate particles to be realized and simultaneously particle agglomeration to be largely reduced. The porous carbon in situ composite lithium iron phosphate cathode material has the advantages of good charge-discharge performance, stable circular property, rate capability, novelty, simple synthetic technology and easy large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a porous carbon in-situ composite lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] Energy is the most basic driving force for the development and economic growth of the entire world, and the basis for human survival. Since the industrial revolution, the traditional fossil fuels (coal, oil, natural gas) in the past have been unable to meet the increasing energy demand of human beings year by year. In order to realize the sustainable development of the whole society, exploring and developing renewable energy that can replace fossil fuels and has the characteristics of high efficiency, cleanliness, safety, and economy has become a strategic goal for the development of energy materials and energy technologies in the new century. As a new type of energy product, lithium-ion secondary batteries are favored by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 范丽珍刘金坤冯玉川陈立功
Owner UNIV OF SCI & TECH BEIJING
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