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Composite lithium iron phosphate anode material and preparation method thereof

A composite cathode material, lithium iron phosphate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low conductivity and unsatisfactory rate performance of lithium iron phosphate

Inactive Publication Date: 2018-03-06
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a lithium iron phosphate composite positive electrode material and a preparation method thereof, which can effectively solve the current technical defects of low electrical conductivity and unsatisfactory rate performance of the current lithium iron phosphate

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  • Composite lithium iron phosphate anode material and preparation method thereof
  • Composite lithium iron phosphate anode material and preparation method thereof
  • Composite lithium iron phosphate anode material and preparation method thereof

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Embodiment 1

[0031] The invention provides a lithium iron phosphate composite positive electrode material, the preparation method of embodiment 1 is as follows: weigh 37mg (0.5mmol) lithium carbonate (Li 2 CO 3 ), 144mg (1mmol) ferrous oxalate (FeC 2 o 4 ), 115mg (1mmol) ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 31.6mg (20wt.%) citric acid (C 6 h 8 o 7 ) was added to 50mL deionized water and 5mL H 2 o 2 After it was completely dissolved, it was put into a stainless steel reaction kettle lined with polytetrafluoroethylene, and hydrothermally reacted at 180°C for 6h. After the reaction is completed, the obtained wet gel precursor is taken out, freeze-dried for 12 hours under vacuum, and finally the dry gel precursor is put into an argon atmosphere and calcined at 750° C. for 8 hours to obtain the lithium iron phosphate composite cathode material of the present invention .

[0032] Lithium source 1 is lithium carbonate, iron source 2 is ferrous oxalate, phosphorus source 3...

Embodiment 2

[0038] see figure 1 , the invention provides a kind of lithium iron phosphate composite cathode material, the preparation method of embodiment 2 is as follows: Weigh 37mg (0.5mmol) lithium carbonate (Li 2 CO 3 ), 144mg (1mmol) ferrous oxalate (FeC 2 o 4 ), 115mg (1mmol) ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 63.2mg (40wt.%) citric acid (C 6 h 8 o 7 ) was added to 50mL deionized water and 5mL H 2 o 2 After being completely dissolved, put it into a stainless steel reaction kettle lined with polytetrafluoroethylene, and conduct a hydrothermal reaction at 180°C for 6 hours. After the reaction was completed, the obtained gel precursor was taken out, freeze-dried under vacuum for 12 hours, and finally the dry gel was put into a nitrogen atmosphere and calcined at 750° C. for 8 hours to obtain the lithium iron phosphate composite cathode material of the present invention.

Embodiment 3

[0040] see figure 1 , the present invention provides a lithium iron phosphate composite positive electrode material, the preparation method of embodiment 3 is as follows: respectively weigh 24mg (1mmol) lithium hydroxide (LiOH), 152mg (1mmol) iron phosphate (FeSO 4 ), 115mg (1mmol) ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 79mg (50wt.%) citric acid (C 6 h 8 o 7 ) was added to 50mL deionized water and 5mL H 2 o 2 After it was completely dissolved, it was put into a stainless steel reactor lined with polytetrafluoroethylene, and hydrothermally reacted at 160°C for 6h. After the reaction is completed, the obtained wet gel precursor is taken out, freeze-dried under vacuum for 12 hours to obtain a dry gel precursor, and finally the dry gel precursor is put into a hydrogen atmosphere and calcined at 750°C for 8 hours to obtain the present invention. Lithium iron phosphate composite cathode material.

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a composite lithium iron phosphate anode material and a preparation method thereof. The composite lithiumiron phosphate anode material is obtained by successively drying and calcining wet gel precursors; and the preparation method of the wet gel precursor comprises the following steps: dissolving a lithium source, an iron source, a phosphorus source and a carbon source in an aqueous solution containing hydrogen peroxide, performing the hydrothermal reaction, wherein the hydrothermal reaction temperature is 100 to 250 DEG C, the reaction time is 1 to 48h, and the pressure in the reaction kettle is 0.1 to 10MPa. The composite lithium iron phosphate anode material and the preparation method thereofsolve the technical defects in the prior art that particle size of the battery material obtained by utilizing carbon to wrap the lithium iron phosphate is wide in range, the sintering time is long, and the homogeneity is poor. By adopting the anode material of the invention, the electrochemical performance such as the reversible capacity, the rate capacity and the cycling performance can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium iron phosphate composite cathode material and a preparation method thereof. Background technique [0002] Due to the excessive exploitation and use of traditional fossil energy, a series of problems such as environmental pollution, smog invasion and ecological imbalance have been caused. In order to promote the sustainable development strategy and realize the peaceful coexistence between man and nature, all countries have begun to vigorously develop renewable energy. We are currently facing more serious environmental problems, so we also pay more attention to the application of renewable energy. However, the intermittence and unpredictability of renewable energy makes it necessary to develop more efficient and low-cost energy storage devices, whether it is widely used in electronic products, electric vehicles or large smart grids. Lithium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 钟国彬王超徐凯琪成城
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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