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Lithium iron phosphate composite material, production method and use thereof

A composite material, lithium iron phosphate technology, used in phosphorus compounds, chemical instruments and methods, impregnation manufacturing, etc., can solve the problems of low charge and discharge rate, low tap density, low electrical conductivity, etc. Conductive effect, high charge-discharge rate effect

Active Publication Date: 2014-12-10
OCEANS KING LIGHTING SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a lithium iron phosphate composite material to solve the problems of low electrical conductivity, low charge-discharge rate and low tap density of existing battery positive electrode materials.

Method used

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  • Lithium iron phosphate composite material, production method and use thereof
  • Lithium iron phosphate composite material, production method and use thereof
  • Lithium iron phosphate composite material, production method and use thereof

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preparation example Construction

[0022] The embodiment of the present invention also provides a method for preparing a lithium iron phosphate composite material, comprising the following steps:

[0023] a), according to the molar ratio of phosphorus element and iron element 1:1, prepare iron salt mixed solution;

[0024] In step a), the iron source used to prepare the mixed solution is to contain Fe 3+ (iron ions) compounds include but not limited to iron oxide, iron sulfate, iron citrate, can also be containing Fe 2+ (Ferrous ion) compounds such as ferric oxide, ferrous sulfate, ammonium ferrous sulfate, ammonium ferrous phosphate, ferrous phosphate, ferrous citrate, ferrous oxide, etc. are obtained by oxidation containing Fe 3+ (iron ion) compound, the oxidizing agent used is not limited to the type, preferably one or more of ammonium persulfate, sodium hypochlorite, hydrogen peroxide with a mass percentage of 30%, and solid hydrogen peroxide. The concentration of the oxidizing agent is 0.1-5mol / L, the ox...

Embodiment 1

[0042] The preparation method of the lithium iron phosphate composite material according to the embodiment of the present invention, the specific steps are as follows:

[0043] I) Preparation of solution containing iron phosphate

[0044] The concentration is 1mol / L ferric nitrate solution and the phosphoric acid solution of weight percent 85%, and the mixing ratio is the molar ratio of P and Fe 1:1, obtains containing mixed solution;

[0045] II) preparation of 100ml concentration is the ammonia solution of 3mol / L;

[0046] III) Add 8g of aniline monomer to 50ml of deionized water to prepare aniline solution;

[0047] IV) Under stirring conditions (such as 500rpm / min), use a peristaltic pump to continuously and simultaneously input the above-mentioned solution containing ferric phosphate into the aniline solution, and use the above-mentioned ammonia solution to control the pH of the reaction system to be 2.0 (±0.1). At 20°C, control the flow rate of the peristaltic pump to ...

Embodiment 2

[0059] The preparation method of the lithium iron phosphate composite material according to the embodiment of the present invention, the specific steps are as follows:

[0060] I), preparation of iron phosphate containing solution

[0061] Prepare a concentration of 1mol / L ferric nitrate solution and 85% phosphoric acid solution, mix the two solutions, the mixing ratio is the molar ratio of P to Fe 1:1, to obtain a solution containing ferric phosphate;

[0062] II), prepare 100ml of 3mol / L ammonia solution;

[0063] III) Add 8g of aniline monomer to 50ml of deionized water to prepare aniline solution;

[0064] IV) Under the condition of stirring (500rpm / min), use a peristaltic pump to continuously and simultaneously input the above-mentioned solution containing iron phosphate into the aniline solution, and use the above-mentioned ammonia solution to control the pH of the reaction system to be 2.0 (±0.1). At 20°C, control the flow rate of the peristaltic pump to 0.45ml / min, r...

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Abstract

Provided are a lithium iron phosphate composite material, the production method thereof and the use thereof. The lithium iron phosphate composite material has a micro-size particle structure, which contains nano-size grains of lithium iron phosphate and graphene inside, and bears nano-carbon particulates outside. The lithium iron phosphate composite material has the properties of high conductivity, high-rate charge / discharge performance and high tap density. The production method comprises: preparing an iron salt mixed solution according to the mole ratio of P : Fe =1:1; adding the above solution into an organic carbon source aqueous solution, followed by mixing and reacting, so as to obtain nano-iron phosphate covered with organic carbon source; adding the above nano-iron phosphate covered with organic carbon source and a lithium source compound into an aqueous solution of graphene oxide, agitating, mixing, and then spray drying, so as to obtain a precursor of lithium iron phosphate composite material; calcinating said precursor in a reduction atmosphere and cooling naturally, so as to obtain said lithium iron phosphate composite material. The material is used for lithium ion battery or positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of battery cathode materials, and in particular relates to a lithium iron phosphate composite material, its preparation method and application. Background technique [0002] Lithium-ion battery is a new type of green and environmentally friendly rechargeable battery developed in the 1990s. Because of its advantages of high working voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life, it is considered to be an ideal energy source for the development of the 21st century and is widely used. In communications, transportation, motor vehicles, military, notebook computers and household appliances, etc. The currently used lithium iron phosphate battery has the advantages of low cost, high temperature resistance, good cycle performance, high specific capacity, flat charge and discharge voltage curve, etc., and has great potential for appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04C01B25/45C01B31/04
CPCH01M4/0471H01M4/5825Y02E60/122C01B25/375H01M4/625H01M4/131H01M10/052H01M4/0416C01B25/45H01M4/366H01M4/1397H01M4/136C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/40Y02E60/10
Inventor 周明杰潘军王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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