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Preparation method for LiFePO4 (lithium iron phosphate) superfine powder serving as power battery anode materials

A positive electrode material, power battery technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficult dispersion of ultrafine powder, difficult coating, etc., to improve conductivity, reduce difficulty, and widely used. Effect

Inactive Publication Date: 2012-06-27
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a kind of power battery cathode material LiFePO 4 The preparation method of ultrafine powder solves the problem of LiFePO 4 The difficulty of dispersing and coating ultrafine powder reduces the difficulty of using ultrafine lithium iron phosphate to make batteries and improves the charge and discharge performance of lithium batteries

Method used

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  • Preparation method for LiFePO4 (lithium iron phosphate) superfine powder serving as power battery anode materials
  • Preparation method for LiFePO4 (lithium iron phosphate) superfine powder serving as power battery anode materials
  • Preparation method for LiFePO4 (lithium iron phosphate) superfine powder serving as power battery anode materials

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Embodiment 1

[0025] Power battery cathode material LiFePO 4 The preparation method of superfine powder, comprises the following steps:

[0026] 1) Weigh LiOH and FeSO according to the lithium:iron:phosphorus molar ratio of 3:0.98:1 4 ·7H 2 O and H 3 PO 4 , and then take by weighing the surfactant oleic acid of above-mentioned three kinds of raw material quality summations 1%, then above-mentioned raw material is dissolved in water respectively;

[0027] 2) Under nitrogen protection atmosphere, H 3 PO 4 , FeSO 4 ·7H 2 The aqueous solution of O and oleic acid is mixed and then added to the reactor to 2+ Play an anti-oxidation effect; then heat to 40°C with stirring, add LiOH solution; then heat to 180°C under airtight conditions, and react for 4 hours; after the reaction is completed, cool naturally, and after cooling down to below 100°C, filter and collect the filter residue Thoroughly wash with water and dry above 100°C to obtain LiFePO 4 Powder;

[0028] 3) The obtained LiFePO ...

Embodiment 2

[0031] Power battery cathode material LiFePO 4 The preparation method of superfine powder, comprises the following steps:

[0032] 1) Weigh LiOH, Fe(NO 3 ) 2 ·6H 2 O and H 3 PO 4 , and then weigh the glucose of 2% of the mass sum of the above three raw materials, and then dissolve the above raw materials in water respectively;

[0033] 2) In Fe(NO 3 ) 2 ·6H 2Add its mass 1% ascorbic acid in the solution dissolved in O water, to Fe 2+ play an antioxidant role, and then combine it with H 3 PO 4 , Glucose aqueous solution is mixed and added to the reaction kettle, and then heated to 50°C under stirring, and then LiOH solution is added;

[0034] Then heated to 200°C under airtight conditions, and reacted for 2 hours; after the reaction was completed, it was cooled naturally, and after cooling down to below 100°C, filtered, the collected filter residue was fully washed with water, dried above 100°C to obtain LiFePO 4 Powder;

[0035] 3) The obtained LiFePO 4 powder in...

Embodiment 3

[0038] Power battery cathode material LiFePO 4 The preparation method of superfine powder, comprises the following steps:

[0039] 1) Weigh LiOH and FeCl according to the lithium:iron:phosphorus molar ratio of 2.5:1.05:1 2 4H 2 O and H 3 PO 4 , and then weigh the lecithin of 2% of the mass sum of the above three raw materials, and then dissolve the above raw materials in water respectively;

[0040] 2) In FeCl 2 4H 2 Add its quality 3% ascorbic acid in the solution that O dissolves in water again, to Fe 2+ play an antioxidant role, and then combine it with H 3 PO 4 1. The aqueous solution of lecithin is mixed and added to the reaction kettle, then heated to 80°C under stirring, and then LiOH solution is added;

[0041] Then heated to 160°C under airtight conditions, and reacted for 5 hours; after the reaction was completed, it was cooled naturally, and after the temperature was lowered to below 100°C, it was filtered, and the filter residue was collected and washed wi...

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Abstract

The invention discloses a preparation method for LiFePO4 (lithium iron phosphate) superfine powder serving as power battery anode materials, which includes the steps: firstly, preparing LiFePO4 tiny crystalline particles with ferrous salt, phosphoric acid, lithium hydroxide and organic solvent through a hydrothermal method; and then performing carbon coating in a CaC2 (calcium carbide)-CCl4 (carbon tetrachloride) reaction system to obtain cotton-shaped nanoscale lithium iron phosphate powder. Therefore, the electric conductivity and the diffusion rate of Li+ (lithium-ion) of the lithium iron phosphate are increased, difficulty in using the superfine lithium iron phosphate to manufacture a battery is decreased, the lithium iron phosphate is more widely applied, and the charge-discharge performances of the lithium battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a power battery positive electrode material LiFePO 4 Preparation method of ultrafine powder. Background technique [0002] Since the commercialization of lithium-ion batteries in the early 1990s, they have been widely used in various fields due to their advantages such as high energy density and no memory effect. Among them, there are many types of anode materials used in lithium batteries. Lithium iron phosphate has abundant raw materials, is environmentally friendly, does not absorb moisture, has high specific capacity (theoretical capacity is 170mAh / g), and has a stable discharge voltage around 3.4V. It has attracted widespread attention due to its advantages such as platform, thermal stability and cycle performance, and is expected to become the cathode material for lithium-ion power batteries. However, hindering LiFePO 4 The bottleneck for commercialization is...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12C01B25/45H01M4/5825Y02E60/10
Inventor 李俊
Owner IRICO
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