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FePO4/high polymer cracked carbon composite material and preparation method thereof, and NH4Fe2(OH)(PO4)2.2H2O/high polymer composite material and preparation method thereof

A technology of 2·2H2O and composite materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems affecting the high-rate performance and low-temperature performance of batteries, achieve remarkable energy-saving effects, simplify the preparation process, improve high-rate performance and The effect of low temperature performance

Active Publication Date: 2014-11-12
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the high purity of the battery-grade anhydrous iron phosphate, the electrical conductivity of the prepared lithium iron phosphate material needs to be improved, which affects the high-rate performance and low-temperature performance of the battery; in order to improve the electrical conductivity, it is necessary to When adding conductive additives for modification, and the iron phosphate precursor should be ground very finely to ensure full contact between the precursor and the conductive additive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare ferrous sulfate and phosphoric acid mixed aqueous solution, wherein ferrous sulfate concentration is 1.5 mol / liter, phosphoric acid concentration is 1.5 mol / liter;

[0049] The preparation concentration is the ammonia solution of 5.0 mol / liter;

[0050] Dissolve 18 g of polyvinylpyrrolidone in deionized water to prepare a 200 ml solution.

[0051] Add 2 liters of deionized water to the reaction kettle with a volume of 7 liters, stir vigorously, and pass constant temperature water into the jacket of the reaction kettle to control the water temperature in the reaction kettle to 70°C;

[0052] Through the air compressor, import air into the reactor as the oxidant with a flow rate of 5 liters / minute;

[0053] Ferrous sulfate and phosphoric acid mixed aqueous solution, ammonia solution, polyvinylpyrrolidone solution are respectively continuously input in the reactor with a pump, the flow rate of controlling ferrous sulfate and phosphoric acid mixed aqueous solution ...

Embodiment 2

[0060] Prepare ferrous sulfate and phosphoric acid mixed aqueous solution, wherein ferrous sulfate concentration is 1.0 mol / liter, phosphoric acid concentration is 1.0 mol / liter;

[0061] Preparation concentration is the ammonia solution of 3.5 mol / liter;

[0062] Dissolve 12 grams of polyethylene glycol in deionized water to prepare a 200 ml solution.

[0063] Add 2 liters of deionized water to the reaction kettle with a volume of 7 liters, stir vigorously, and pass constant temperature water into the jacket of the reaction kettle to control the water temperature in the reaction kettle to 80°C;

[0064] Through the air compressor, import air into the reactor as the oxidant with a flow rate of 5 liters / minute;

[0065] Ferrous sulfate and phosphoric acid mixed aqueous solution, ammonia solution, polyethylene glycol solution are continuously input in the reactor respectively with pump, the flow of controlling ferrous sulfate and phosphoric acid mixed aqueous solution is 20 mil...

Embodiment 3

[0072] Prepare ferrous sulfate and phosphoric acid mixed aqueous solution, wherein ferrous sulfate concentration is 0.5 mol / liter, phosphoric acid concentration is 0.5 mol / liter;

[0073] The preparation concentration is the ammonia solution of 2.0 mol / liter;

[0074] Dissolve 6 g of polyvinyl alcohol in deionized water to make a 200 ml solution.

[0075] Add 2 liters of deionized water to the reaction kettle with a volume of 7 liters, stir vigorously, and pass constant temperature water into the jacket of the reaction kettle, and control the water temperature in the reaction kettle to 50°C;

[0076] Through the air compressor, import air into the reactor as the oxidant with a flow rate of 5 liters / minute;

[0077] The mixed aqueous solution of ferrous sulfate and phosphoric acid, ammonia solution, and polyvinyl alcohol solution are continuously input into the reaction kettle with a pump, and the flow rate of the mixed aqueous solution of ferrous sulfate and phosphoric acid i...

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PUM

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Abstract

The invention relates to an FePO4 / high polymer cracked carbon composite material and a preparation method thereof, and a NH4Fe2(OH)(PO4)2.2H2O / high polymer composite material and a preparation method thereof. The method comprises the following steps: stirring a ferrous sulfate / phosphoric acid mixture water solution to react by using air as an oxidizer, thereby generating a crystalline compound NH4Fe2(OH)(PO4)2.2H2O containing ammonium, hydroxyl group and crystalline water; meanwhile, adding at least one of a high polymer solution, an emulsion, a polymerization monomer and an initiator to implement high polymer / NH4Fe2(OH)(PO4)2.2H2O in-situ composite coprecipitation, thereby preparing the NH4Fe2(OH)(PO4)2.2H2O / high polymer composite material; and carrying out solid-liquid separation, washing, drying, and roasting in an inert atmosphere to decompose and convert the NH4Fe2(OH)(PO4)2.2H2O into FePO4, thereby preparing the FePO4 / high polymer cracked carbon composite material. The FePO4 / high polymer cracked carbon composite material is a precursor with obviously improved conductivity for preparing the lithium iron phosphate positive pole material, and is beneficial to enhancing the high magnification property and low-temperature properties of the material; and thus, the FePO4 / high polymer cracked carbon composite material is a more ideal precursor for preparing the lithium iron phosphate positive pole material.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation and relates to FePO 4 / polymer pyrolysis carbon composite material and its preparation method and the NH used to prepare the composite material 4 Fe 2 (OH)(PO 4 ) 2 2H 2 The invention discloses an O / polymer composite material and a preparation method thereof. The composite material is an ideal precursor for preparing lithium iron phosphate, an anode material of a lithium ion battery. Background technique [0002] Lithium iron phosphate cathode material has the advantages of high safety and long life, and is an ideal cathode material for lithium-ion power batteries. With the rapid development of new energy vehicles and other related industries, the market demand for power batteries has grown rapidly, and the demand for lithium iron phosphate cathode materials has also grown rapidly. [0003] The preparation process of lithium iron phosphate cathode material is various. Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 应皆荣刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV