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Method for synthesizing iron phosphate with doped metallic elements

A technology of metal elements and synthesis methods, applied in the direction of electrical components, electrode manufacturing, battery electrodes, etc., can solve problems such as high price, limited wide-scale use, and environmental pollution

Inactive Publication Date: 2010-04-07
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most commercial lithium-ion batteries use lithium cobalt oxide and lithium nickel cobalt manganese oxide as positive electrode materials. The commonly used lithium cobalt manganese oxide has high capacity and good thermal stability. and other shortcomings, which limit the wide-scale use of the material

Method used

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  • Method for synthesizing iron phosphate with doped metallic elements

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] (1) With ferric nitrate as the iron source and nickel sulfate as the nickel source, the molar ratio of n(Fe):n(M)=0.8:0.2 is used to accurately weigh each material, and an appropriate amount of distilled water is added to prepare iron and a mixed aqueous solution of nickel; (2) prepared into a 2.5mol / L solution. With 1 mol / L of ammonium dihydrogen phosphate and 1.5 mol / L of ammonium phosphate as the phosphorus source; (3) using 10 mol / L of ammonia as a complexing agent and adjusting the pH value of the reaction system; (4) the above steps (1) The total molar concentration of the mixed aqueous solution of middle iron is 1.0mol / L; (5) using a volume of 2L reactor, the reaction control reaction temperature is 95 ℃, and the iron mixed solution containing doped Ni element is respectively mixed with a precision electronic metering pump The flow rate of 10ml / min, the phosphorus solution is pumped into the reactor at the flow rate of 4.2ml / min, the flow rate of the ammonia solu...

Embodiment 2

[0008] (1) Ferrous sulfate of iron is used as iron source, and vanadium chloride is used as vanadium source. According to the ratio of molar ratio n(Fe):n(M)=0.98:0.02, accurately weigh each material, add appropriate amount of distilled water, and prepare a mixed aqueous solution of iron and vanadium elements; (2) prepare a 1mol / L solution . With 0.5mol / L of ammonium phosphate and 0.5mol / L of trisodium phosphate as the phosphorus source; (3) using 6mol / L of ammonia as a complexing agent and adjusting the pH value of the reaction system; (4) the above steps (1) The total molar concentration of the mixed aqueous solution of iron is 0.5mol / L; (5) using a volume of 2L reactor, the reaction control reaction temperature is 40 ° C, and the iron mixed solution containing doped V element is respectively mixed with a precision electronic metering pump. The flow rate of 20ml / min, the phosphorus solution is pumped into the reactor at the flow rate of 12ml / min, the flow rate of the ammoni...

Embodiment 3

[0010] (1) Ferric nitrate is used as the iron source, and cobalt sulfate is used as the cobalt source. According to the ratio of molar ratio n(Fe):n(M)=0.95:0.05, accurately weigh each material, add an appropriate amount of distilled water, and prepare a mixed aqueous solution of iron and cobalt elements; (2) prepare a 2mol / L solution . With ammonium hydrogen phosphate 1.0mol / L, trisodium phosphate 1.0mol / L mixed solution is phosphorus source; (3) with the ammoniacal liquor of 6mol / L as complexing agent and adjust the pH value of reaction system; (4) above step (1 ) The total molar concentration of the mixed aqueous solution of iron in ) is 0.5mol / L; (5) using a volume of 2L reactor, the reaction temperature is controlled to be 65 ℃, and the iron mixed solution containing doped Co element is separately mixed with a precision electronic metering pump With the flow rate of 20ml / min, the phosphorus solution is pumped into the reactor at the flow rate of 12ml / min, the flow rate o...

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Abstract

The invention relates to a method for synthesizing iron phosphate with doped metallic elements. The method comprises the following steps of: (1) using sulfate, chloride or nitrate of iron as an iron source, mixing any one of substances containing other metal cation elements with the iron source, accurately weighting each material in a mol ratio, and adding distilled water into the materials to prepare a mixed solution, wherein the total mol concentration of the mixed solution is 0.1 to 5 mol / L; (2) using one or a mixture of more than one of ammonium dihydrogen phosphate, ammonium phosphate, ammonium hydrogen phosphate and trisodium phosphate as a phosphorus source, and preparing phosphorus solution of which the mol concentration is 1 to 5 mol / L; (3) using ammonia water as a complexing agent and a neutralizing agent; (4) controlling the reaction temperature to between 20 and 98 DEG C, pumping the mixed solution doped with the doped metallic elements and the phosphorus solution into a reactor respectively, controlling the pH value by the ammonia water, and stirring the mixture to ensure that the mixture is continuously co-precipitated in the reactor to generate the iron phosphate with spherical doped metallic elements; and (5) aging, spin-drying, washing and drying the reaction solution to obtain the iron phosphate with the doped metallic elements. The method has the advantages of simple operation, stable performance, low manufacturing cost, sterility and no pollution.

Description

Technical field: [0001] The invention relates to a secondary battery, in particular to a method for synthesizing ferric phosphate doped with metal elements. Background technique: [0002] Lithium-ion secondary batteries have the advantages of high energy density and excellent cycle performance, and are considered to be ideal high-capacity and high-power batteries. They are widely used in portable appliances, military equipment and other fields, and can also be used in electric vehicles and hybrid electric vehicles. Power Battery. In the composition of lithium battery products, the cathode material directly determines the performance indicators of the final lithium ion battery product. Most commercial lithium-ion batteries use lithium cobalt oxide and lithium nickel cobalt manganese oxide as positive electrode materials. The commonly used lithium cobalt manganese oxide has high capacity and good thermal stability. Such disadvantages limit the wide-scale application of this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 程迪徐拥军魏玲贾金桃王明强尹正中
Owner HENAN KELONG NEW ENERGY CO LTD
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