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Polymer carbonized in-situ coated ferric fluoride composite positive electrode material and preparation method thereof

A composite positive electrode material, ferric trifluoride technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve problems such as low electronic conductivity, improve lithium ion conductivity and electronic conductivity, and improve cycle Performance and rate performance, low production cost

Active Publication Date: 2016-10-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Doping conductive carbon materials (graphene, carbon black, carbon nanotubes, etc.) in the iron trifluoride cathode material is the most common method, which can effectively improve the low electron density of the iron trifluoride cathode material. The problem of conductivity, but it cannot solve the problem of lithium ion transport during charging and discharging.

Method used

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  • Polymer carbonized in-situ coated ferric fluoride composite positive electrode material and preparation method thereof
  • Polymer carbonized in-situ coated ferric fluoride composite positive electrode material and preparation method thereof
  • Polymer carbonized in-situ coated ferric fluoride composite positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of polymer carbonization in-situ coated ferric trifluoride composite positive electrode material

[0034] Prepare FeCl with a concentration of 0.3M 3 aqueous solution and a concentration of 1.0M NH 4 F aqueous solution;

[0035] In the polytetrafluoroethylene reactor, the prepared FeCl 3 The solution was mixed with 0.1g lauryltrimethylammonium bromide, the polytetrafluoroethylene reactor was placed on the stirrer and stirred at room temperature for 30min, and then fluoride ion and FeCl were added dropwise. 3 The molar ratio of iron ions in solution is 1:4 with NH 4F solution, stirred and reacted at 80°C for 20h, and FeF containing crystal water was obtained after the reaction was completed. 3 precipitation;

[0036] The above FeF 3 The precipitate was washed 3 times with absolute ethanol, transferred to an 80°C drying oven with argon gas for drying for 12 hours, cooled to room temperature, and then placed in an argon-protected tubular atmosph...

Embodiment 2

[0038] Example 2 Preparation of polymer carbonization in-situ coated ferric trifluoride composite positive electrode material

[0039] Prepare FeCl with a concentration of 0.01M 3 Aqueous solution and NH at a concentration of 0.03M 4 F aqueous solution;

[0040] In the polytetrafluoroethylene reactor, the prepared FeCl 3 The solution was mixed with 0.05g lauryltrimethylammonium bromide, the polytetrafluoroethylene reaction kettle was placed on the stirrer and stirred at room temperature for 20min, and then fluoride ion and FeCl were added dropwise. 3 The molar ratio of iron ions in solution is 1:3 with NH 4 F solution, stirred and reacted at 50°C for 12h, and FeF containing crystal water was obtained after the reaction was completed. 3 precipitation;

[0041] The above FeF 3 The precipitate was washed 2 to 3 times with absolute ethanol, transferred to a 60°C drying oven with argon gas for drying for 15 hours, cooled to room temperature, and then placed in an argon-protec...

Embodiment 3

[0043] Example 3 Preparation of polymer carbonization in-situ coated ferric trifluoride composite positive electrode material

[0044] Prepare FeCl with a concentration of 0.5M 3 Aqueous solution and NH at a concentration of 1.5M 4 F aqueous solution;

[0045] In the polytetrafluoroethylene reactor, the prepared FeCl 3 The solution was mixed with 0.15g lauryltrimethylammonium bromide, the polytetrafluoroethylene reaction kettle was placed on the stirrer and stirred at room temperature for 40min, and then fluoride ion and FeCl were added dropwise. 3 The molar ratio of iron ions in solution is 1:5 with NH 4 F solution, stirred and reacted at 100°C for 28 hours, and FeF containing crystal water was obtained after the reaction was completed. 3 precipitation;

[0046] The above FeF 3 The precipitate was washed 3 times with absolute ethanol, transferred to a 100°C drying oven with argon gas for drying for 10 h, cooled to room temperature, and then placed in a nitrogen-protecte...

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Abstract

The invention relates to the field of lithium secondary battery positive electrode material, and discloses a polymer carbonized in-situ coated ferric fluoride composite positive electrode material, and a preparation method and an application thereof. The mass ratio of ferric fluoride and carbon in the polymer carbonized in-situ coated ferric fluoride composite positive electrode material is 1:9 to 1:15, and the particle size is 60-120 mm; the composite positive electrode material is prepared by high temperature carbonization of the polymer coating the surface of the ferric fluoride for direct in-situ coating, wherein the polymer is polythiophene, poly(p-xylylenediamine) or polyaniline. The composite positive electrode material disclosed by the invention has the advantages of good rate performance, cycle performance, charge / discharge specific capacity, electronic ionic conductivity and the like; the preparation method disclosed by the invention is simple in steps, low in production cost, and favorable to popularization and application.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium secondary batteries, in particular to FeF coated with iron trifluoride in situ by polymer carbonization 3 / C composite positive electrode material and preparation method thereof. Background technique [0002] The gradual consumption of primary energy has led to the rise of sustainable secondary energy. Following solar energy, wind energy, and tidal energy, lithium secondary batteries that can be recharged and discharged have also entered people's lives. In order to meet the increasing demand for electric energy of modern electronic technology products, a green lithium secondary battery with stable charge and discharge, high capacity, long continuous working time, and safety and reliability is essential. [0003] The competition in the lithium secondary battery industry is becoming increasingly fierce. The most important components of lithium secondary batteries are positive...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 许帅军李军黄思李少芳李雪峰
Owner GUANGDONG UNIV OF TECH
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