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Lithium iron phosphate-based composite conductor positive electrode material and preparation method, positive electrode and lithium battery

A technology of lithium iron phosphate and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance, low conductivity, and low discharge capacity of lithium-ion batteries, so as to improve performance and improve conductivity sexual effect

Active Publication Date: 2016-07-06
FOSHAN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a lithium iron phosphate-based composite conductor positive electrode material and a preparation method thereof, so as to solve the problem of the low electrical conductivity of the existing lithium iron phosphate positive electrode material and the preparation of lithium-ion battery discharge. Technical problems of low capacity and poor cycle performance

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  • Lithium iron phosphate-based composite conductor positive electrode material and preparation method, positive electrode and lithium battery
  • Lithium iron phosphate-based composite conductor positive electrode material and preparation method, positive electrode and lithium battery
  • Lithium iron phosphate-based composite conductor positive electrode material and preparation method, positive electrode and lithium battery

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preparation example Construction

[0030] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned lithium iron phosphate-based composite conductor positive electrode material. For the process flow of this method, please refer to figure 1 . The preparation method of the lithium iron phosphate-based composite conductor positive electrode material comprises the following steps:

[0031] Step S01: adding the organic carbon source and the lithium source, iron source, and phosphorus source for preparing lithium iron phosphate into a solvent to dissolve to obtain a solution or emulsion A;

[0032] Step S02: Disperse spherical conductive carbon, sheet-shaped conductive carbon, and tubular conductive carbon with a mass ratio of (10-50):(10-50):(10-50) in a solvent in the presence of a dispersant to form mixed solution B;

[0033] Step S03: Mix the solution or emulsion A prepared in step S01 with the mixed solution B prepared in step S02 to obtain mixed solutio...

Embodiment 1

[0060] A lithium iron phosphate-based composite conductor positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0061] Step S11: Weigh the battery-grade raw materials lithium nitrate, iron nitrate, ammonium dihydrogen phosphate, and citric acid according to the molar ratio of Li:Fe:P:C=1.1:1:1:0.5 (theoretical product is 1 mole), and Dissolve in deionized water in sequence, and magnetically stir until a transparent solution A is formed;

[0062] Step S12: Weigh 0.5g of spherical carbon black, 0.5g of flake graphite, 0.5g of multi-walled carbon nanotubes, and 0.2g of polyethylene glycol, and uniformly disperse the above-mentioned conductive carbon source in the mixture containing polyethylene glycol by a high-speed disperser. In the aqueous solution, a mixed solution B is formed;

[0063] Step S13: Add the mixed solution B to the solution A, stir for 2 hours to form a uniform emulsion, put the emulsion in an oven...

Embodiment 2

[0066] A lithium iron phosphate-based composite conductor positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0067] Step S21: Weigh the battery-grade raw materials lithium hydroxide, ferrous oxalate, ammonium dihydrogen phosphate, and glucose according to the molar ratio of Li:Fe:P:C=1.1:1:1:0.1 (theoretical product is 1 mole), and sequentially dissolved in an aqueous solution of ethanol, and magnetically stirred until a transparent solution A is formed;

[0068] Step S22: Weigh 0.2g of carbon black, 0.2g of carbon fiber, 0.2g of double-walled carbon nanotubes, and 0.1g of polyethylene oxide, and uniformly disperse the above-mentioned conductive carbon source in the aqueous solution added with polyethylene oxide through a probe ultrasonic instrument to form mixed solution B;

[0069] Step S23: Add the mixed solution B to the solution A, stir for 2 hours to form a uniform emulsion, put the emulsion in an oven,...

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Abstract

The invention discloses a lithium iron phosphate-based composite conductor positive electrode material and a preparation method thereof as well as a positive electrode and a lithium battery. The lithium iron phosphate-based composite conductor positive electrode material is an in-situ carbon-coated lithium iron phosphate composite conductor positive electrode material; carbon comprises spherical conductive carbon, sheet conductive carbon and tubular conductive carbon which are in a mass ratio of (10-50):(10-50):(10-50). The preparation method comprises the following steps: preparing a mixed solution of a lithium source, an iron source, a phosphorus source and an organic carbon source, preparing a mixed solution of the spherical conductive carbon, the sheet conductive carbon and the tubular conductive carbon, mixing the two mixed solutions, preheating, performing ball-milling, drying, and calcining. Both the positive electrode of the lithium battery and the lithium battery comprise the lithium iron phosphate-based composite conductor positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium iron phosphate-based composite conductor positive electrode material and a preparation method thereof, a lithium battery positive electrode and a lithium battery. Background technique [0002] In recent years, lithium iron phosphate, a cathode material for lithium-ion batteries, has attracted much attention due to its wide source of raw materials, low price, excellent thermal stability, good cycle performance, safety and non-toxicity, and is considered to be an ideal anode for a new generation of lithium-ion batteries. However, the low electronic conductivity of lithium iron phosphate has become a bottleneck for its commercial development. [0003] In order to improve the electronic conductivity of lithium iron phosphate materials, researchers have carried out a lot of research in academia, among which the carbon coating technology is the most successful. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/136H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽赖玉丽黄永侃陈玲震胡秋琴
Owner FOSHAN DYNANONIC