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Preparation method of ferric fluoride cathode material for lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of high-purity anhydrous hydroxy-free ferric fluoride materials, can solve the problems such as the difficulty in preparing high-purity anhydrous ferric fluoride, achieve short cycle, uniform particle size, and easy operation easy effect

Active Publication Date: 2016-02-17
中国船舶重工集团公司第七一二研究所
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing an iron fluoride positive electrode material for lithium-ion batteries in view of the disadvantage that the existing method is difficult to prepare high-purity anhydrous ferric fluoride

Method used

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  • Preparation method of ferric fluoride cathode material for lithium ion battery
  • Preparation method of ferric fluoride cathode material for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0015] First weigh 0.242g of ferric nitrate and dry it in a 110°C oven, add 2mL of hydrofluoric acid into a 20mL Teflon-lined reactor, then put the reactor into a 110°C oven to remove water, and add the raw materials after 2 hours In the reaction kettle, react at 190°C for 72h, wash with water until neutral, filter with suction and dry at 90°C to obtain ferric fluoride.

[0016] The X-ray powder diffraction pattern of the ferric fluoride material sample can be found in figure 1 . exist figure 1 Among them, the abscissa is the diffraction angle, the ordinate is the diffraction intensity, the upper curve is the measured X-ray diffraction pattern, and the lower vertical lines are FeF from top to bottom. 3 , FeF 3 ·3H 2 O, FeF 3 0.33H 2 O theoretical diffraction peak position, given by figure 1 It can be seen that the sample is characterized by high purity. Depend on figure 2 It can be seen that the sample does not contain water and hydroxyl groups.

[0017] The inventi...

Embodiment 2

[0019] Weigh 0.242g of ferric nitrate and dry it in an oven at 110°C, add 2mL of hydrofluoric acid into a 20mL polytetrafluoroethylene-lined reactor, add the raw materials to the reactor after 2h, react at 240°C for 48h, and wash with water until Neutral, after suction filtration, dry at 90°C to obtain ferric fluoride.

Embodiment 3

[0021] First weigh 0.242g of ferric nitrate and dry it in an oven at 110°C, add 3mL of hydrofluoric acid into a 20mL polytetrafluoroethylene-lined reactor, add ferric nitrate into the reactor after 2h, react at 240°C for 48h, wash with water To neutrality, after suction filtration, dry at 110°C to obtain ferric fluoride.

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Abstract

The invention discloses a preparation method of a ferric fluoride cathode material for a lithium ion battery. The preparation method comprises the steps: firstly, putting a trivalent iron salt into a drying oven, drying, then mixing the dried raw material with a right amount of a high-activity fluorine source, then adding into a polytetrafluoroethylene reaction kettle, carrying out an acid thermal reaction, washing with water, filtering, and drying to obtain the target product ferric fluoride. The prepared ferric fluoride has high purity and uniform particle size; the particle size can be controlled through adjusting process conditions, and the prepared product has good dispersity. The preparation method has the advantages of mild synthetic conditions, simple process, simple and convenient operation, short period, high efficiency, low requirements on equipment and easy industrialized mass production of the high-purity ferric fluoride material containing hydroxyl (or water).

Description

technical field [0001] The invention mainly relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a high-purity anhydrous hydroxyl-free ferric fluoride material with conversion activity. Background technique [0002] In recent years, lithium-ion batteries have been widely used in portable electronic devices, and have gradually been applied in electric vehicles, microelectronics manufacturing, space exploration, medicine, and smart grid energy storage. However, the main lithium-ion batteries currently on the market cannot meet the demand for high specific capacity, because LiCoO 2 、LiFePO 4 The amount of intercalation or extraction of Li in the representative intercalation-type positive electrode materials cannot exceed 0.5 or 1, resulting in a specific capacity range of 130-160mAh / g. Because of this defect, conversion-type cathode materials have been gradually paid attention to and developed beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/582H01M10/0525Y02E60/10
Inventor 孙立志刘显杰程耿孙宝彭戴
Owner 中国船舶重工集团公司第七一二研究所
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