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Preparation method for nanoscale lithium iron phosphate

A lithium iron phosphate, nano-scale technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of uneven coating, inability to nano-scale, and insufficient product purity, and achieve higher purity and higher conductivity. , the effect of excellent electrochemical performance

Inactive Publication Date: 2014-04-09
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a preparation method for synthesizing nanoscale lithium iron phosphate materials in the liquid phase in the field. This method solves the problems of insufficient purity of the product in the synthesis, inability to nanometerization and uneven coating, etc., and can Obtain nano-scale high-purity lithium iron phosphate with high tap density and excellent electrochemical performance

Method used

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  • Preparation method for nanoscale lithium iron phosphate
  • Preparation method for nanoscale lithium iron phosphate
  • Preparation method for nanoscale lithium iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Raw material Fe(OH) 3 Synthesis

[0028] Weigh 0.1mol Fe(NO 3 ) 3 Dissolve in 300ml water, stir until completely dissolved to obtain a yellow clear solution, weigh 20g ammonia water dropwise and add it to a beaker to form a reddish brown precipitate. During the precipitation process, use magnetic stirring and vigorously stir to make the precipitation complete. After adding the ammonia water, continue to stir for 5 minutes. Fe(OH) 3 The precipitate was filtered and washed for several times, then transferred to an oven at 105°C for vacuum drying, ready for use.

[0029] 2. Synthesis of lithium iron phosphate precursor

[0030] Add 0.15mol Fe(OH) into a round bottom flask filled with N2 3 And add 0.15mol of H 3 PO 4 In a water bath, the temperature was 70°C for stirring reaction, and the ultrasound was turned on for 1.5 hours. The reaction color changed from red to milky white slurry precipitation. Weigh 2 g of ascorbic acid and add it to the round-bottomed flask, and contin...

Embodiment 2

[0035] 1. Raw material Fe(OH) 3 Synthesis

[0036] Weigh 0.1mol Fe(NO 3 ) 3 Dissolve in 300ml water, stir until completely dissolved to obtain a yellow clear solution, weigh 20g ammonia water dropwise and add it to a beaker to form a reddish brown precipitate. During the precipitation process, use magnetic stirring and vigorously stir to make the precipitation complete. After adding the ammonia water, continue to stir for 5 minutes. Fe(OH) 3 The precipitate was filtered and washed for several times, then transferred to an oven at 105°C for vacuum drying, ready for use.

[0037] 2. Synthesis of lithium iron phosphate precursor

[0038] N in the pass 2 Add 0.15mol Fe(OH) to the round bottom flask 3 And add 0.15mol of H 3 PO 4 In a water bath, the temperature was 70°C for stirring reaction, and the ultrasound was turned on for 1.5 hours. The reaction color changed from red to milky white slurry precipitation. Weigh 2g of hydrazine hydrate and add it to the round-bottomed flask, contin...

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Abstract

The invention relates to a method for synthesizing a nanoscale lithium iron phosphate positive electrode material, and specifically relates to a method for synthesizing a lithium iron phosphate material in a liquid phase by using synthetic iron hydroxide as a reactant. The method can reduce impurity ions in the material and reduce particle size. Besides, the performance of the material is comprehensively increased by introducing liquid phase C coating.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of nanoscale lithium iron phosphate. Background technique [0002] LiFePO with olivine structure 4 It has the advantages of high capacity (theoretical specific capacity 170mAh / g), non-toxic, cheap, good thermal stability in charge and discharge state, small moisture absorption and excellent charge and discharge cycle performance, etc., especially suitable for use As a lithium-ion high-power power supply. Therefore, from the perspective of environment and development, the development of LiFePO4 positive electrode materials will enable lithium-ion batteries to break through the current storage capacity and power limit, and then promote the large-scale of lithium-ion batteries (electric vehicles, electric tools and decentralized power grid peak regulation) , Miniaturization (multifunctional mobile phone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCC01B25/45H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 戴思琦龚金保冯海兰
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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