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Preparation method of lithium iron phosphate and battery anode

A lithium iron phosphate, lithium source technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of cumbersome process, unsatisfactory conductivity, high cost, etc., and achieve simple process and high current charge and discharge performance. Excellent, low-cost effects

Inactive Publication Date: 2011-06-29
钟志源 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned solutions are either expensive, cumbersome, or unsatisfactory in improving the conductivity, and cannot well meet the market demand.

Method used

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  • Preparation method of lithium iron phosphate and battery anode
  • Preparation method of lithium iron phosphate and battery anode
  • Preparation method of lithium iron phosphate and battery anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0031] 0.01mol of ferrous acetate, 0.01mol of phosphoric acid and 0.02mol of LiOH·H 2 O were dissolved in 10ml of secondary deionized water under stirring, then the three transparent solutions were mixed to obtain a light green mixed precipitate, then 1g of PVP was added, the pH value of the mixed solution was adjusted to about 7 with urea aqueous solution, and the secondary deionized solution was added Ionized water to 100ml, stirred evenly, then transferred the mixture into a hydrothermal reaction vessel, screwed it tightly and placed it in a blast drying oven with a constant temperature of 180°C, reacted continuously for 12 hours, and then took the hydrothermal reaction vessel out of the oven, Place it in the air to cool down to room temperature naturally, filter, wash, and vacuum-dry at 30°C. The obtained material was analyzed by XRD to be phase-pure olivine LiFePO 4 structure, the space group is Pnma. SEM( figure 2 ) analysis shows that the product is a very uniform s...

Embodiment 3

[0033] Dissolve 0.01mol of ferrous chloride, 0.01mol of dipotassium hydrogen phosphate and 0.03mol of lithium nitrate in 10ml of secondary deionized water respectively under stirring, then mix the three transparent solutions to obtain a light green mixed precipitate, Then add 20ml of ethylene glycol, adjust the pH value of the mixed solution to about 9 with NaOH aqueous solution, add secondary deionized water to 100ml, stir well, then transfer the mixture to a hydrothermal reaction vessel, screw it tightly and place it at a constant temperature of 200°C The reaction was continued for 24 hours in a blast drying oven, and then the hydrothermal reaction kettle was taken out of the oven, placed in the air to cool naturally to room temperature, filtered, washed, and vacuum-dried at 80°C. The obtained material was analyzed by XRD as pure phase olivine LiFePO 4 structure, the space group is Pnma. TEM( image 3 ) analysis shows that most of the product particles have the morphology ...

Embodiment 4

[0035] 0.01mol of ferrous nitrate, 0.01mol of phosphoric acid and 0.03mol of LiOH·H 2 O were dissolved in 10ml of secondary deionized water under stirring, and then the three transparent solutions were mixed to obtain a light green mixed precipitate, then 2g of citric acid was added, and the pH value of the mixture was adjusted to about 8 with ammonium carbonate, and then the secondary Deionized water to 100ml, stir evenly, then transfer the mixture to a hydrothermal reaction vessel, screw it tightly and place it in a blast drying oven with a constant temperature of 220°C, react continuously for 24 hours, and then take the hydrothermal reaction vessel out of the oven , placed in the air to cool naturally to room temperature, filtered, washed, and vacuum-dried at 60°C. The obtained material was analyzed by XRD as pure phase olivine LiFePO 4 structure, the space group is Pnma. SEM( Figure 4 ) analysis shows that the product is very uniform polyhedral micron particles with a ...

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Abstract

The invention provides a method for preparing lithium iron phosphate, which comprises the following steps: (a) well mixing an aqueous solution of bivalent iron source compound, an aqueous solution of phosphorus source compound, and an aqueous solution of lithium source compound with a molar ratio of Fe, P and Li being 1:1:2-3 so as to obtain a well-mixed mixture; (b) adding a morphology control agent into the mixture, and adjusting the pH of the mixture to be 7-10; (c) adding the mixture into a reaction vessel, placing the reaction vessel under a temperature of 120-250 DEG C for reaction for 2-36 hours; (d) cooling to room temperature, filtering, washing, drying at a temperature of 30-120 DEG C so as to obtain lithium iron phosphate particles. The lithium iron phosphate prepared by the method of the invention has structured morphology, a narrow distribution range of particle sizes or even monodisperse particles, and excellent electrochemical properties with good charge-discharge performance for high current; and the preparation method has simple process, low cost, and facilitates the realization of industrialization.

Description

technical field [0001] The invention relates to a preparation method of lithium ferrous phosphate, and further relates to the lithium ferrous phosphate prepared by the method and a positive electrode of a battery containing the lithium ferrous phosphate. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) has outstanding advantages such as thermal stability, long life, rich raw materials, environmental friendliness, low price, and safety (overcharging and overcharging will not cause explosion), so it has become the most promising anode for a new generation of secondary lithium-ion batteries. materials, especially suitable for large power sources used in hybrid electric vehicles. However, the olivine structure has the disadvantages of low electronic conductivity and low lithium ion diffusion rate, so its high-rate performance is very poor, which severely limits its commercial application. [0003] In order to solve this problem, a lot of...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 卢周广钟志源
Owner 钟志源
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