Preparation method for lithium manganese/iron phosphate composite material

A technology of lithium iron manganese phosphate and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficult industrialization, high cost, and difficult operation, improve conductivity and rate performance, and reduce impedance. and polarization, the effect of shortening the conduction distance

Inactive Publication Date: 2016-12-07
SHENZHEN SONGDING TECH
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AI Technical Summary

Problems solved by technology

[0006] Currently LiMn x Fe y PO 4 The synthesis method of the present invention mainly contains, high-temperature solid-phase method, hydrothermal method, sol-gel method etc.; The method is mainly suitable for the synthesis of materials with special morphology (such as nanorods); the sol-gel method is more cumbersome and costly
The above-mentioned methods generally have problems such as complex process, difficult operation, environmental protection, high cost, etc., and industrialization is difficult

Method used

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  • Preparation method for lithium manganese/iron phosphate composite material
  • Preparation method for lithium manganese/iron phosphate composite material
  • Preparation method for lithium manganese/iron phosphate composite material

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preparation example Construction

[0026] A preparation method of lithium manganese iron phosphate composite material, comprising the following steps:

[0027] Step S110, dissolving the phosphorus-containing compound and the manganese-containing compound in water to form a mixed solution.

[0028] Preferably, the phosphorus-containing compound is selected from at least one of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium phosphate, disodium hydrogen phosphate and disodium hydrogen phosphate. More preferably, the phosphorus-containing compound is selected from at least one of ammonium phosphate, diammonium hydrogen phosphate and ammonium dihydrogen phosphate.

[0029] Preferably, the manganese-containing compound is at least one selected from manganese oxalate, manganese chloride, manganese sulfate, manganese nitrate, manganese acetate and manganese formate. More preferably, the manganese-containing compound is at least one selected from manganese oxalate, manganese ni...

Embodiment 1

[0061] At room temperature (around 25°C), 0.1 mol of (NH 4 ) 2 HPO 4 and 0.1mol of MnCl 2 Dissolve in 800mL of pure water, start to stir, add 150mL of isopropanol dropwise to the solution at a rate of 2mL / S, and a precipitate occurs; continue to stir for 2H, filter the solution to obtain a precipitate, and then wash with pure water for 3 times, at 90 Bake at ℃ for 2H to obtain the precursor MnHPO 4 ·3H 2 O.

[0062] 0.08mol precursor MnHPO 4 ·3H 2 O with 0.05mol Li 2 CO 3 , 0.02mol FeCl 2 and mass for MnHPO 4 ·3H 2 O. Li 2 CO 3 and FeCl 2 3% of the total mass of glucose was mixed, added to the ball mill jar, and 20g of ethanol was added; ball milled for 4H, then the mixture was taken out, baked at 90°C for 3H, and then under the protection of 5% hydrogen-argon gas mixture, the mixture was heated for 3 The rate of ℃ / min is raised to 650 ℃ for 10H and then cooled to obtain carbon-coated lithium iron manganese phosphate LiMn 0.8 Fe 0.2 PO 4 .

Embodiment 2

[0064] At room temperature (around 25°C), 0.2 mol of NH 4 h 2 PO 4 and 0.2mol of Mn(NO 3 ) 4 Dissolve in 2L of pure water, start to stir, drop 300mL of propanol into the solution at a rate of 3mL / S, and a precipitate occurs; continue to stir for 2H, filter the solution to obtain a precipitate, then wash with pure water 3 times, at 90°C Bake for 2H to obtain the precursor MnHPO 4 ·3H 2 O.

[0065] 0.07mol precursor MnHPO 4 ·3H 2 O with 0.105mol LiOH, 0.03mol FeC 2 o 4 and mass for MnHPO 4 ·3H 2 O, LiOH and FeC 2 o 4 5% of the total mass of sucrose was mixed, added to the ball mill jar, and 20g of acetone was added; ball milled for 4H, then the mixture was taken out, baked at 90°C for 3H, and then heated at a rate of 5°C / min under the protection of argon Calcined at 800°C for 8H, cooled to obtain carbon-coated lithium iron manganese phosphate LiMn 0.7 Fe 0.3 PO 4 .

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Abstract

The invention relates to a preparation method for a lithium manganese/iron phosphate composite material. The preparation method for the lithium manganese/iron phosphate composite material is characterized by comprising the following steps of dissolving a phosphorus-containing compound and a manganese-containing compound into water to form a mixed solution; adding a precipitator into the mixed solution, stirring and fully precipitating to obtain a MnHPO<4> hydrate, wherein the precipitator is selected from at least one kind of propyl alcohol, isopropanol and butanol; performing ball milling on a carbon-containing compound, at least one kind of compounds containing doping elements, and the MnHPO<4> hydrate, a lithium-containing compound, a ferrous-containing compound and a dispersing agent jointly, and drying to obtain a mixture; and calcining the mixture in an atmosphere of a protective gas at a temperature of 550-800 DEG C for 8-16h to obtain the lithium manganese/iron phosphate composite material. The preparation method for the lithium manganese/iron phosphate composite material is simple in process; and the prepared lithium manganese/iron phosphate composite material is relatively good in the electrical performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium manganese iron phosphate composite material for a positive electrode of a lithium ion battery. Background technique [0002] Compared with other secondary batteries (nickel-cadmium, nickel-metal hydride, lead-acid), lithium-ion batteries have high energy density, high working voltage, long cycle life, low self-discharge, green environmental protection, no memory effect, wide operating temperature range, etc. It has developed rapidly since it was launched in 1992. It has been widely used in various portable electronic products such as mobile phones and notebook computers. It also has broad application prospects in fields such as electric vehicles and energy storage power station systems. [0003] The current commercial lithium-ion battery cathode materials include lithium-containing oxides of transition metals such as lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 陈晴川卢舜毅蒋建军
Owner SHENZHEN SONGDING TECH
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