Lithium iron phosphate composite material, its preparation method and application

A technology of lithium iron phosphate and composite materials, which is applied to non-aqueous electrolyte battery electrodes, structural parts, circuits, etc., can solve the problem that the battery cannot be quickly charged and discharged, and achieve the effect of improving electrical conductivity and rapid charging and discharging.

Active Publication Date: 2012-05-02
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 technical pro

Method used

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  • Lithium iron phosphate composite material, its preparation method and application
  • Lithium iron phosphate composite material, its preparation method and application
  • Lithium iron phosphate composite material, its preparation method and application

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preparation example Construction

[0021] The preparation method of the lithium iron phosphate of the embodiment of the present invention, the specific steps are as follows:

[0022] a) According to the metal M, iron element and phosphorus element molar ratio is x: 1-x: 1, prepare iron salt mixed solution;

[0023] In step a), preparation containing chemical composition is Fe 1-x m x PO 4 solutions of nanoparticles, by containing Fe 3+ The compound or its solution, the compound of metal M ion or its solution, containing PO 4 3- The compound or its solution is prepared by reacting in a solvent.

[0024] The above contains Fe 3+ The compounds include but are not limited to iron oxide, iron sulfate, iron citrate, and can also be composed of Fe 2+ 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+ There is no limitation on the type of oxidant used, preferably...

Embodiment 1

[0046] Chemical composition is LiFe 0.8 Cr 0.2 PO 4 The preparation method of lithium iron phosphate composite material, concrete steps are as follows

[0047] 1) add ferric nitrate, 85% phosphoric acid, chromium nitrate in aqueous solution, wherein the ratio of the molar number of P and the total molar number of Fe and Cr is 1: 1, ferric nitrate concentration is 2mol / L, chromium nitrate and nitric acid The molar ratio of iron is 1:4;

[0048] II) prepare 100ml of aqueous ammonia solution of 6mol / L;

[0049] III) The deionized water of 50ml is in the beaker and the aniline monomer of 8g is added, under the condition of stirring (500rpm / min) with peristaltic pump continuously simultaneously above-mentioned I) obtains solution input and fills in the solution of aniline monomer, with The pH value of the above-mentioned ammonia solution is controlled to be 2.0 in the reaction system, reacted at 50°C for 2 hours, controlled the flow rate of the peristaltic pump to 0.45ml / min, s...

Embodiment 2

[0060] Chemical composition is LiFe 0.7 Cr 0.3 PO 4 The preparation method of lithium iron phosphate composite material, concrete steps are as follows

[0061] 1) add ferric nitrate, chromium nitrate in aqueous solution, ferric nitrate concentration is 2mol / L, and the mol ratio of chromium nitrate and ferric nitrate is 3: 7;

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

[0063] III) 50ml of deionized water is added to a beaker and 8g of aniline monomer and ammonium dihydrogen phosphate (the total molar ratio of P to iron and chromium is 1:1), under stirring conditions (500rpm / min) with The peristaltic pump continuously feeds the solution obtained in the above I) into the solution of solution III) at the same time, controls the pH value of the reaction system to 4.0 with the above ammonia solution, reacts at 50°C for 2 hours, and controls the flow rate of the peristaltic pump to 0.45ml / min , after the solution was finished, continue to stir for 2 hours, c...

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Abstract

The invention is suitable for the technical field of batteries, and provides a lithium iron phosphate composite material, its preparation method and an application. The lithium iron phosphate composite material has a nanoparticle structure with lithium iron phosphate nanocrystals as the core. The external surface of the nanoparticle structure is covered with a nano-carbon particle coating, the external surface of which is covered with grapheme. The chemical composition of the lithium iron phosphate nanocrystals is LiFe1-xMxPO4, wherein M is metal ions and x is being less than 1 and greater than or equal to 0.001. By cladding the nano-carbon particles with the lithium iron phosphate crystals, adding grapheme and adding metal ions in the lithium iron phosphate crystals, conductivity of the lithium iron phosphate composite material in the embodiment of the invention is greatly improved. Simultaneously, the nano particle size of the lithium iron phosphate crystals guarantees rapid charge and discharge of the lithium iron phosphate crystals in the embodiment of the invention.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium iron phosphate composite material, a preparation method and application thereof. Background technique [0002] In the prior art, lithium-ion battery cathode materials are concentrated on lithium transition metal oxides such as layered LiMO 2 (M=Co, Ni, Mn) and LiMn with spinel structure 2 o 4 . As cathode materials, they have their own characteristics, LiCoO 2 High cost, poor resources, high toxicity; LiNiO 2 Difficult to prepare, poor thermal stability; LiMn 2 o 4 The capacity is low and the cycle stability is poor. LiFePO 4 Wide source of raw materials, low price, no environmental pollution, good thermal stability of the material, and outstanding safety performance of the prepared battery make it a new generation of lithium-ion battery cathode material with the most potential for development and application. However, the prior art lithium iron p...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/136H01M4/1397H01M4/139
CPCY02E60/122Y02E60/10
Inventor 周明杰潘军王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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