A preparation method of nanoporous lithium-rich lithium iron phosphate material

A lithium iron phosphate, nano-porous technology, applied in the direction of nano-technology, structural parts, electrical components, etc., can solve the problems of poor liquid absorption capacity, poor conductivity, low initial efficiency, etc., achieve strong liquid absorption and retention capacity, improve Cycle performance, the effect of high cycle performance

Active Publication Date: 2021-08-31
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, lithium iron phosphate cathode materials are mostly prepared by solid phase method, which has defects such as poor conductivity, poor liquid absorption capacity and insufficient long-cycle lithium ion content.
Although some researchers improve the liquid absorption and retention capacity of their materials by preparing porous lithium iron phosphate, for example, the patent (CN107221672A) discloses an olive-shaped porous lithium iron phosphate and its preparation method, which is mainly through the method of hydrothermal-segment firing Although the prepared material has been improved in terms of liquid absorption capacity, its first-time efficiency is low and its lithium ion content is insufficient, which affects the long-term cycle performance of its lithium-ion battery

Method used

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  • A preparation method of nanoporous lithium-rich lithium iron phosphate material
  • A preparation method of nanoporous lithium-rich lithium iron phosphate material
  • A preparation method of nanoporous lithium-rich lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of lithium powder composite A:

[0021] First, 95 g of propylene carbonate is dissolved in 500 mL of n-hexane organic solvent, then add 5 g of lithium powder and 0.5 g sif 4 , Mix evenly to obtain lithium powder composite A;

[0022] 2) Preparation of lithium iron phosphate phosphate:

[0023] 13.32G lico 3 (0.18 mol), 72.72G Fe (NO 3 ) 3 · 9h 2 O (0.18 mol), 18.72G LiH 2 PO 4 (0.18 mol) was mixed with 800 GN-methylpyrrolidone, then 3 g of amino lithium was adjusted to a pH of 9, then add 20 g of lithium powder composite A, which was transferred to a high pressure reaction kettle, and at temperatures 200 ° C, Reaction 12H, filtered to give a lithium phosphate precursor material B;

[0024] 3) Preparation of multi-porous lithium phosphate composites:

[0025] The 80 g of a lithium phosphate precursor material B was added to a glucose solution of 500 ml of a concentration of 10%, and the spherium-rich lithium phosphate was mixed and uniformly sprayed, and the b...

Embodiment 2

[0027] 1) Preparation of lithium powder composite A:

[0028] First weigh 90 g of polymethylsiloxane dissolved in 500 mL of n-hexane organic solvent, then add 10 g of lithium powder and 0.1 gsnf. 4 , Mix evenly to obtain lithium powder composite A;

[0029] 2) Preparation of lithium iron phosphate precursor material B:

[0030] 1.2 g liOH (0.05 mol), 77.05G FEC 6 Hide 5 O 7 · 5h 2 O (0.23mol), 23.92g Lih 2 PO 4 (0.23 mol) was added to 500 mlN-methylpyrrolidone, then 1 g of amino lithium was added to the pH of 8 to 10, then the lithium powder composite material A was added, and transferred to a high pressure reaction kettle, and at a temperature of 150 ° C, Reaction 24 h, filtered to obtain a lithium phosphate precursor material B;

[0031] 3) Preparation of multi-porous lithium phosphate composites:

[0032] 50 g of a lithium phosphate precursor material B was placed in a glucose solution of 500 g of a glucose solution to a glucose solution to prepare a pellet-rich lithium phospha...

Embodiment 3

[0034] 1) Preparation of lithium powder composite A:

[0035] First, 99 g of polyacrylate is dissolved in 500 mL of n-hexane organic solvent, then add 1 g of lithium powder and 1 g of whole fluoropylmine, stir evenly to obtain a lithium powder composite A;

[0036] 2) Preparation of lithium iron phosphate precursor material B:

[0037] 9.6 g liOH (0.4mol), 67G FEC 6 Hide 5 O 7 · 5h 2 O (0.2mol), 20.8g lih 2 PO 4 (0.2 mol) Adding an amino lithium was added to the oily solvent to add amino lithium adjusted to pH 10, then add 30 g of lithium powder composite A, transferred to a high pressure reaction kettle, and at a temperature of 300 ° C, reaction for 2 h, filtration is rich Lithium iron phosphate precursor material B;

[0038] 3) Preparation of multi-porous lithium phosphate composites:

[0039] The 100 g of a lithium phosphate precursor material B was placed in a 500 ml concentration of 10% glucose aqueous solution mixed uniform spray drying to prepare a pellet-rich lithium phosp...

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Abstract

The invention belongs to the field of preparation of lithium-ion battery materials, and specifically relates to a preparation method of a nanoporous lithium-rich lithium iron phosphate material. At the same time, fully mix the lithium salt, phosphorus salt, and iron source at the atomic level, add lithium amide and stir evenly, then add the above lithium powder complex, then dissolve it in the glucose solution, stir evenly, and spray dry to obtain The precursor is dissolved in tetrahydrofuran to remove the polymer template and heat-treated to obtain a porous lithium-rich lithium iron phosphate composite material. In the present invention, the prepared nanoporous lithium-rich lithium iron phosphate material utilizes the lithium ions provided by the core lithium powder to improve the transmission rate, gram capacity and liquid absorption capacity of lithium ions in the charging and discharging process, and is applied to lithium ion batteries , has the characteristics of good rate performance and excellent cycle performance.

Description

Technical field [0001] The present invention belongs to the preparation of lithium ion battery materials, and is specifically a nanoporous lithium phosphate material and a preparation method thereof. Background technique [0002] Lithium iron phosphate is applied to the field of pure electric passenger cars in the field of high safety performance, good cycle life, environmentally friendly, and has increased the phosphate battery with 3000- with the national energy density of lithium-ion batteries and its cycle life. 5000 cycle life. At present, there are mostly deficient preparation of solid phase method, poor conductivity difference, poor liquidification capacity and lack of lithium ion content in low cycle. Although some researchers increase the absorbent capacity of its material by preparing lithium phosphate, such as patented (CN107221672A) discloses olive porous phosphate and preparation method thereof, which is mainly by hydrothermal-section It is prepared, and the prepared...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/5825H01M10/0525Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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