Positive pole material of lithium ion battery and preparation method of positive pole material

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as electrochemical performance that needs to be improved qualitatively

Active Publication Date: 2015-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the combination of graphene and cathode materials is still a difficult research point, and the electrochemical performance needs to be improved qualitatively.

Method used

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  • Positive pole material of lithium ion battery and preparation method of positive pole material
  • Positive pole material of lithium ion battery and preparation method of positive pole material
  • Positive pole material of lithium ion battery and preparation method of positive pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Add 2.28g of oxalic acid to 70mL of aqueous solution dispersed with 2.55g of ammonium metavanadate, stir until the solution is brownish yellow, transfer the brownish yellow solution to a 100mL autoclave, place it in an oven, 180 °C for 12 hours, and after suction filtration, the sample was dried in an oven at 80 °C for 12 hours, and the precursor (NH 4 ) 5 V 2 o 5 . 1g of precursor ((NH 4 )5 V 2 o 5 Dissolve in 300mL aqueous solution, add 0.17g lithium hydroxide monohydrate to the solution, then add 0.2g polyethylene glycol 4000 as a dispersant, stir at room temperature for 2 hours, then heat in an oil bath at 80°C until the solvent evaporates to dryness. The obtained samples were calcined at 450 °C in an air atmosphere for 8 h to obtain crystallized LiV 3 o 8 Nanosheets.

[0031] The second step, weigh 0.5g LiV 3 o 8 , dissolved in 50mL of toluene solution, sonicated for 30min at 300w power, LiV 3 o 8 The dispersion of the nanosheets is better, and...

Embodiment 2

[0033] Step 1: Add 2.28g of oxalic acid to 70mL of aqueous solution dispersed with 2.55g of ammonium metavanadate, stir until the solution is brownish yellow, transfer the brownish yellow solution to a 100mL autoclave, place it in an oven, 180 °C for 12 hours, and after suction filtration, the sample was dried in an oven at 80 °C for 12 hours, and the precursor (NH 4 ) 5 V 2 o 5 . 1g of precursor (NH 4 ) 5 V 2 o 5 Dissolve in 300mL aqueous solution, add 0.17g lithium hydroxide monohydrate to the solution, then add 0.2g polyvinylpyrrolidone as a dispersant, stir at room temperature for 2 hours, then heat in an oil bath at 80°C until the solvent evaporates to dryness. The obtained samples were calcined at 450 °C in an air atmosphere for 8 h to obtain crystallized LiV 3 o 8 Nanosheets.

[0034] The second step, weigh 0.5g LiV 3 o 8 , dissolved in 50mL of toluene solution, sonicated for 30min at 300w power, LiV 3 o 8 The dispersion of the nanosheets is better, and th...

Embodiment 3

[0036] Step 1: Add 2.28g of oxalic acid to 70mL of aqueous solution dispersed with 2.55g of ammonium metavanadate, stir until the solution is brownish yellow, transfer the brownish yellow solution to a 100mL autoclave, place it in an oven, 180 °C for 12 hours, and after suction filtration, the sample was dried in an oven at 80 °C for 12 hours, and the precursor (NH 4 ) 5 V 2 o 5 . 1g of precursor (NH 4 ) 5 V 2 o 5 Dissolve in 300mL aqueous solution, add 0.17g lithium hydroxide monohydrate to the solution, then add 0.2g polyethylene glycol 4000 as a dispersant, stir at room temperature for 2 hours, then heat in an oil bath at 80°C until the solvent evaporates to dryness. The obtained samples were calcined at 450 °C in an air atmosphere for 8 h to obtain crystallized LiV 3 o 8 Nanosheets.

[0037] The second step, weigh 0.5g LiV 3 o 8 , dissolved in 50mL of toluene solution, sonicated for 30min at 300w power, LiV 3 o 8 The dispersion of the nanosheets is better, an...

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Abstract

The invention relates to a preparation method of a positive pole material of a lithium ion battery. The positive pole material is formed by compounding a LiV3O8 nano-sheet layer and a graphene layer coated on the surface of LiV3O8, wherein the content of LiV3O8 nano-sheet is 65-90% by weight, and the content of graphene is 10-35% by weight. When the positive pole material is prepared, a hydrothermal synthesis method, a sol-gel method and a surface modification coating method are combined to synthesize the battery material with excellent electrochemical properties. Compared with the prior art, by adopting the preparation method, the stability of a crystal structure of the LiV3O8 sheet layer is retained, and meanwhile, graphene is used as a carrier, so that a novel positive pole material of the lithium ion battery with a larger specific surface area, better electric conductivity, higher lithium ion transmission efficiency and stronger chemical stability is formed. The method is simple in process and strong in operability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] As a new type of energy storage device, the development of lithium-ion batteries and lithium-ion battery energy storage systems will surely promote the effective use of renewable energy and the development of new energy vehicles, which is of great significance for solving energy shortages and reducing environmental pollution. In the past ten years, the research on cathode materials for lithium-ion batteries has mainly focused on LiCoO with a spinel structure. 2 , LiMn 2 o 4 and LiFePO with olivine structure 4 and their derivatives. LiCoO 2 It is the first commercial cathode material, but its usable capacity is less than 150mAh / g, and Li 1-x CoO 2 Structurally unstable, LiCoO 2 It is easy to undergo oxidation-reduction reaction with the electrolyte,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/362H01M4/485H01M4/583H01M4/62Y02E60/10
Inventor 王开学王宗凯陈接胜
Owner SHANGHAI JIAO TONG UNIV
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