Lithium iron phosphate composite and preparation method thereof

A composite material, lithium iron phosphate technology, applied in the field of materials, can solve the problems of poor electrical conductivity, reduce volume specific capacity, hinder Li+ intercalation and desorption reactions, etc., and achieve the effect of good cycle performance and volume specific capacity improvement.

Inactive Publication Date: 2018-06-01
DALIAN ZINTELLIGENCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People usually use carbon coating to solve the problem of poor conductivity. In addition, carbon black needs to be added during the preparation of the positive electrode to further enhance the conductivity, but the c

Method used

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Embodiment 1

[0015] This embodiment discloses a preparation method of a lithium iron phosphate composite material, comprising the following steps: weighing a certain amount of sodium benzenesulfonate into a three-necked flask, adding 100ml of deionized water to completely dissolve it, and weighing an appropriate amount of LiFe -PO 4 and 1ml of pyrrole were added to a three-necked flask, ultrasonically mixed for 1-3h, and an appropriate amount of FeCl was added under ice bath and nitrogen protection 3 Solution, electromagnetic stirring reaction for 6h, the obtained product was successively washed several times with deionized water and ethanol, and dried in vacuum at 60°C for 12h to obtain PPY / LiFePO 4 composite material. The ultrasonic mixing time is 1.5-2h. Mix lithium iron phosphate composite material, acetylene black and PVDF at a mass ratio of 8:1:1, add a certain amount of 1-methyl-2-pyrrolidone (NMP), grind it into a slurry in an agate mortar, and spread it on an aluminum foil Afte...

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Abstract

The invention provides a lithium iron phosphate composite and a preparation method thereof. The preparation method of the lithium iron phosphate composite comprises the following steps of weighing a certain quantity of sodium benzene sulfonate, putting the sodium benzene sulfonate in a three-necked flask, thoroughly dissolving the sodium benzene sulfonate with 100ml deionized water, weighing a proper quantity of LiFe-PO4 and 1ml pyrrole, adding the LiFe-PO4 and the pyrrole in the three-necked flask, performing ultrasonic mixing for 1-3h, adding a proper quantity of Fecl3 solution under ice bath and nitrogen protection, performing electromagnetic stirring reaction for 6h, centrifugally washing an obtained product with the deionized water and ethanol for many times sequentially, and performing vacuum drying for 12h at the temperature of 60 DEG C to obtain the PPY/LiFePO4 composite. The lithium iron phosphate composite is high in tapping density, and thus the specific volumetric capacityof the LiFePO4 is increased.

Description

technical field [0001] The invention relates to material technology, in particular to a lithium iron phosphate composite material and a preparation method thereof. Background technique [0002] LiFePO 4 As a new generation of lithium-ion battery cathode materials with application potential, it has received extensive attention from all walks of life. It has the advantages of low price, abundant raw material sources, stable structure, high specific capacity, good cycle performance, high safety in use, and environmental friendliness. It is widely used in various mobile power sources, especially in the field of power sources. But on the other hand, since LiFePO 4 The material's low electronic conductivity, low lithium ion diffusion coefficient, and low packing density limit its wider application. At present, the main modification methods for the above shortcomings include metal ion doping, carbon coating, and increasing the specific surface area by reducing the particle size....

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 谷亚男
Owner DALIAN ZINTELLIGENCE TECH
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